1
|
Garo-Pascual M, Zhang L, Valentí-Soler M, Strange BA. Superagers resist typical age-related white matter structural changes. J Neurosci 2024:e2059232024. [PMID: 38684365 DOI: 10.1523/jneurosci.2059-23.2024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 01/10/2024] [Accepted: 01/31/2024] [Indexed: 05/02/2024] Open
Abstract
Superagers are elderly individuals with the memory ability of people 30 years younger and provide evidence that age-related cognitive decline is not inevitable. In a sample of 64 superagers (mean age 81.9; 59% women) and 55 typical older adults (mean age 82.4; 64% women) from the Vallecas Project, we studied, cross-sectionally and longitudinally over 5 years with yearly follow-ups, the global cerebral white matter status as well as region-specific white matter microstructure assessment derived from diffusivity measures. Superagers and typical older adults showed no difference in global white matter health (total white matter volume, Fazekas score, and lesions volume) cross-sectionally or longitudinally. However, analyses of diffusion parameters revealed better white matter microstructure in superagers than in typical older adults. Cross-sectional differences showed higher fractional anisotropy (FA) in superagers mostly in frontal fibres and lower mean diffusivity (MD) in most white matter tracts, expressed as an anteroposterior gradient with greater group differences in anterior tracts. FA decrease over time is slower in superagers than in typical older adults in all white matter tracts assessed, which is mirrored by MD increases over time being slower in superagers than in typical older adults in all white matter tracts except for the corticospinal tract, the uncinate fasciculus and the forceps minor. The better preservation of white matter microstructure in superagers relative to typical older adults supports resistance to age-related brain structural changes as a mechanism underpinning the remarkable memory capacity of superagers, while their regional ageing pattern is in line with the last-in-first-out hypothesis.Significance Statement Episodic memory is one of the cognitive abilities most vulnerable to ageing. Although memory normally declines with age, some older people may have memory performance similar to that of people 30 years younger, and this phenomenon is often conceptualised as superageing. Understanding the superager phenotype can provide insights into mechanisms of protection against age-related memory loss and dementia. We studied the white matter structure of a large sample of 64 superagers over the age of 80 and 55 age-matched typical older adults during 5 years with yearly follow-ups showing evidence of slower age-related changes in the brains of superagers especially in protracted maturation tracts, indicating resistance to age-related changes and a regional ageing pattern in line with the last-in-first-out hypothesis.
Collapse
Affiliation(s)
- Marta Garo-Pascual
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politécnica de Madrid, IdISSC, Madrid, Spain 28223
- Alzheimer Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Centre, Madrid, Spain 28031
- PhD Program in Neuroscience, Autonomous University of Madrid-Cajal Institute, Madrid, Spain 28029
| | - Linda Zhang
- Alzheimer Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Centre, Madrid, Spain 28031
| | - Meritxell Valentí-Soler
- Alzheimer Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Centre, Madrid, Spain 28031
| | - Bryan A Strange
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politécnica de Madrid, IdISSC, Madrid, Spain 28223
- Alzheimer Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Centre, Madrid, Spain 28031
| |
Collapse
|
2
|
Fetterhoff D, Costa M, Hellerstedt R, Johannessen R, Imbach L, Sarnthein J, Strange BA. Neuronal population representation of human emotional memory. Cell Rep 2024; 43:114071. [PMID: 38592973 PMCID: PMC11063625 DOI: 10.1016/j.celrep.2024.114071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 03/07/2024] [Accepted: 03/21/2024] [Indexed: 04/11/2024] Open
Abstract
Understanding how emotional processing modulates learning and memory is crucial for the treatment of neuropsychiatric disorders characterized by emotional memory dysfunction. We investigate how human medial temporal lobe (MTL) neurons support emotional memory by recording spiking activity from the hippocampus, amygdala, and entorhinal cortex during encoding and recognition sessions of an emotional memory task in patients with pharmaco-resistant epilepsy. Our findings reveal distinct representations for both remembered compared to forgotten and emotional compared to neutral scenes in single units and MTL population spiking activity. Additionally, we demonstrate that a distributed network of human MTL neurons exhibiting mixed selectivity on a single-unit level collectively processes emotion and memory as a network, with a small percentage of neurons responding conjointly to emotion and memory. Analyzing spiking activity enables a detailed understanding of the neurophysiological mechanisms underlying emotional memory and could provide insights into how emotion alters memory during healthy and maladaptive learning.
Collapse
Affiliation(s)
- Dustin Fetterhoff
- Laboratory for Clinical Neuroscience, Center for Biomedical Technology, Universidad Politécnica de Madrid, IdISSC, Madrid, Spain.
| | - Manuela Costa
- Laboratory for Clinical Neuroscience, Center for Biomedical Technology, Universidad Politécnica de Madrid, IdISSC, Madrid, Spain
| | - Robin Hellerstedt
- Laboratory for Clinical Neuroscience, Center for Biomedical Technology, Universidad Politécnica de Madrid, IdISSC, Madrid, Spain
| | - Rebecca Johannessen
- Swiss Epilepsy Center, Klinik Lengg, Zurich, Switzerland; Department of Psychology, University of Zurich, Switzerland
| | - Lukas Imbach
- Swiss Epilepsy Center, Klinik Lengg, Zurich, Switzerland; Neuroscience Center Zurich, University of Zurich and ETH Zurich, Zurich, Switzerland
| | - Johannes Sarnthein
- Neuroscience Center Zurich, University of Zurich and ETH Zurich, Zurich, Switzerland; Department of Neurosurgery, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Bryan A Strange
- Laboratory for Clinical Neuroscience, Center for Biomedical Technology, Universidad Politécnica de Madrid, IdISSC, Madrid, Spain; Reina Sofia Centre for Alzheimer's Research, Madrid, Spain
| |
Collapse
|
3
|
Ortega‐Cruz D, Bress KS, Gazula H, Rabano A, Iglesias JE, Strange BA. Three-dimensional histology reveals dissociable human hippocampal long-axis gradients of Alzheimer's pathology. Alzheimers Dement 2024; 20:2606-2619. [PMID: 38369763 PMCID: PMC11032559 DOI: 10.1002/alz.13695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 12/04/2023] [Accepted: 12/18/2023] [Indexed: 02/20/2024]
Abstract
INTRODUCTION Three-dimensional (3D) histology analyses are essential to overcome sampling variability and understand pathological differences beyond the dissection axis. We present Path2MR, the first pipeline allowing 3D reconstruction of sparse human histology without a magnetic resonance imaging (MRI) reference. We implemented Path2MR with post-mortem hippocampal sections to explore pathology gradients in Alzheimer's disease. METHODS Blockface photographs of brain hemisphere slices are used for 3D reconstruction, from which an MRI-like image is generated using machine learning. Histology sections are aligned to the reconstructed hemisphere and subsequently to an atlas in standard space. RESULTS Path2MR successfully registered histological sections to their anatomic position along the hippocampal longitudinal axis. Combined with histopathology quantification, we found an expected peak of tau pathology at the anterior end of the hippocampus, whereas amyloid-beta (Aβ) displayed a quadratic anterior-posterior distribution. CONCLUSION Path2MR, which enables 3D histology using any brain bank data set, revealed significant differences along the hippocampus between tau and Aβ. HIGHLIGHTS Path2MR enables three-dimensional (3D) brain reconstruction from blockface dissection photographs. This pipeline does not require dense specimen sampling or a subject-specific magnetic resonance (MR) image. Anatomically consistent mapping of hippocampal sections was obtained with Path2MR. Our analyses revealed an anterior-posterior gradient of hippocampal tau pathology. In contrast, the peak of amyloid-beta (Aβ) deposition was closer to the hippocampal body.
Collapse
Affiliation(s)
- Diana Ortega‐Cruz
- Laboratory for Clinical Neuroscience, Center for Biomedical TechnologyUniversidad Politécnica de Madrid, IdISSCMadridSpain
- Alzheimer's Disease Research UnitCIEN Foundation, Queen Sofia Foundation Alzheimer CenterMadridSpain
| | - Kimberly S. Bress
- Alzheimer's Disease Research UnitCIEN Foundation, Queen Sofia Foundation Alzheimer CenterMadridSpain
- Present address:
Vanderbilt University School of MedicineNashvilleTennesseeUSA
| | - Harshvardhan Gazula
- Martinos Center for Biomedical ImagingMassachusetts General Hospital and Harvard Medical SchoolBostonMassachusettsUSA
| | - Alberto Rabano
- Alzheimer's Disease Research UnitCIEN Foundation, Queen Sofia Foundation Alzheimer CenterMadridSpain
| | - Juan Eugenio Iglesias
- Martinos Center for Biomedical ImagingMassachusetts General Hospital and Harvard Medical SchoolBostonMassachusettsUSA
- Computer Science and Artificial Intelligence LaboratoryMassachusetts Institute of TechnologyBostonMassachusettsUSA
- Centre for Medical Image ComputingUniversity College LondonLondonUK
| | - Bryan A. Strange
- Laboratory for Clinical Neuroscience, Center for Biomedical TechnologyUniversidad Politécnica de Madrid, IdISSCMadridSpain
- Alzheimer's Disease Research UnitCIEN Foundation, Queen Sofia Foundation Alzheimer CenterMadridSpain
| |
Collapse
|
4
|
Sánchez‐Moreno B, Zhang L, Mateo G, Moldenhauer F, Brudfors M, Ashburner J, Nachev P, de Asúa DR, Strange BA. Voxel-based dysconnectomic brain morphometry with computed tomography in Down syndrome. Ann Clin Transl Neurol 2024; 11:143-155. [PMID: 38158639 PMCID: PMC10791030 DOI: 10.1002/acn3.51940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 09/23/2023] [Accepted: 10/20/2023] [Indexed: 01/03/2024] Open
Abstract
OBJECTIVE Alzheimer's disease (AD) is a major health concern for aging adults with Down syndrome (DS), but conventional diagnostic techniques are less reliable in those with severe baseline disability. Likewise, acquisition of magnetic resonance imaging to evaluate cerebral atrophy is not straightforward, as prolonged scanning times are less tolerated in this population. Computed tomography (CT) scans can be obtained faster, but poor contrast resolution limits its function for morphometric analysis. We implemented an automated analysis of CT scans to characterize differences across dementia stages in a cross-sectional study of an adult DS cohort. METHODS CT scans of 98 individuals were analyzed using an automatic algorithm. Voxel-based correlations with clinical dementia stages and AD plasma biomarkers (phosphorylated tau-181 and neurofilament light chain) were identified, and their dysconnectomic patterns delineated. RESULTS Dementia severity was negatively correlated with gray (GM) and white matter (WM) volumes in temporal lobe regions, including parahippocampal gyri. Dysconnectome analysis revealed an association between WM loss and temporal lobe GM volume reduction. AD biomarkers were negatively associated with GM volume in hippocampal and cingulate gyri. INTERPRETATION Our automated algorithm and novel dysconnectomic analysis of CT scans successfully described brain morphometric differences related to AD in adults with DS, providing a new avenue for neuroimaging analysis in populations for whom magnetic resonance imaging is difficult to obtain.
Collapse
Affiliation(s)
- Beatriz Sánchez‐Moreno
- Adult Down Syndrome Unit, Department of Internal MedicineHospital Universitario de La PrincesaMadridSpain
| | - Linda Zhang
- Alzheimer Disease Research UnitCIEN Foundation, Queen Sofia Foundation Alzheimer CentreMadridSpain
| | - Gloria Mateo
- Adult Down Syndrome Unit, Department of Internal MedicineHospital Universitario de La PrincesaMadridSpain
| | - Fernando Moldenhauer
- Adult Down Syndrome Unit, Department of Internal MedicineHospital Universitario de La PrincesaMadridSpain
| | - Mikael Brudfors
- Wellcome Centre for Human NeuroimagingUniversity College LondonLondonUK
| | - John Ashburner
- Wellcome Centre for Human NeuroimagingUniversity College LondonLondonUK
| | - Parashkev Nachev
- High‐Dimensional Neurology GroupUniversity College London Queen Square Institute of NeurologyLondonUK
| | - Diego Real de Asúa
- Adult Down Syndrome Unit, Department of Internal MedicineHospital Universitario de La PrincesaMadridSpain
| | - Bryan A. Strange
- Alzheimer Disease Research UnitCIEN Foundation, Queen Sofia Foundation Alzheimer CentreMadridSpain
- Laboratory for Clinical NeuroscienceCTB, Universidad Politécnica de MadridMadridSpain
| |
Collapse
|
5
|
Ortega-Cruz D, Bress KS, Gazula H, Rabano A, Iglesias JE, Strange BA. Three-dimensional histology reveals dissociable human hippocampal long axis gradients of Alzheimer's pathology. bioRxiv 2023:2023.12.05.570038. [PMID: 38105985 PMCID: PMC10723286 DOI: 10.1101/2023.12.05.570038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2023]
Abstract
INTRODUCTION Three-dimensional (3D) histology analyses are essential to overcome sampling variability and understand pathological differences beyond the dissection axis. We present Path2MR, the first pipeline allowing 3D reconstruction of sparse human histology without an MRI reference. We implemented Path2MR with post-mortem hippocampal sections to explore pathology gradients in Alzheimer's Disease. METHODS Blockface photographs of brain hemisphere slices are used for 3D reconstruction, from which an MRI-like image is generated using machine learning. Histology sections are aligned to the reconstructed hemisphere and subsequently to an atlas in standard space. RESULTS Path2MR successfully registered histological sections to their anatomical position along the hippocampal longitudinal axis. Combined with histopathology quantification, we found an expected peak of tau pathology at the anterior end of the hippocampus, while amyloid-β displayed a quadratic anterior-posterior distribution. CONCLUSION Path2MR, which enables 3D histology using any brain bank dataset, revealed significant differences along the hippocampus between tau and amyloid-β.
Collapse
Affiliation(s)
- Diana Ortega-Cruz
- Laboratory for Clinical Neuroscience, Center for Biomedical Technology, Universidad Politécnica de Madrid, IdISSC, 28223, Madrid, Spain
- Alzheimer's Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Center, 28031, Madrid, Spain
| | - Kimberly S Bress
- Alzheimer's Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Center, 28031, Madrid, Spain
- Current address: Vanderbilt University School of Medicine, 37232, Nashville, TN, USA
| | - Harshvardhan Gazula
- Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, 02129, Boston, MA, USA
| | - Alberto Rabano
- Alzheimer's Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Center, 28031, Madrid, Spain
| | - Juan Eugenio Iglesias
- Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, 02129, Boston, MA, USA
- Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology, 02139, Boston, MA, USA
- Centre for Medical Image Computing, University College London, WC1V 6LJ, London, United Kingdom
| | - Bryan A Strange
- Laboratory for Clinical Neuroscience, Center for Biomedical Technology, Universidad Politécnica de Madrid, IdISSC, 28223, Madrid, Spain
- Alzheimer's Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Center, 28031, Madrid, Spain
| |
Collapse
|
6
|
Ortega-Cruz D, Iglesias JE, Rabano A, Strange BA. Hippocampal sclerosis of aging at post-mortem is evident on MRI more than a decade prior. Alzheimers Dement 2023; 19:5307-5315. [PMID: 37366342 PMCID: PMC10751387 DOI: 10.1002/alz.13352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 05/05/2023] [Accepted: 05/26/2023] [Indexed: 06/28/2023]
Abstract
INTRODUCTION Hippocampal sclerosis of aging (HS) is an important component of combined dementia neuropathology. However, the temporal evolution of its histologically-defined features is unknown. We investigated pre-mortem longitudinal hippocampal atrophy associated with HS, as well as with other dementia-associated pathologies. METHODS We analyzed hippocampal volumes from magnetic resonance imaging (MRI) segmentations in 64 dementia patients with longitudinal MRI follow-up and post-mortem neuropathological evaluation, including HS assessment in the hippocampal head and body. RESULTS Significant HS-associated hippocampal volume changes were observed throughout the evaluated timespan, up to 11.75 years before death. These changes were independent of age and Alzheimer's disease (AD) neuropathology and were driven specifically by CA1 and subiculum atrophy. AD pathology, but not HS, was associated significantly with the rate of hippocampal atrophy. DISCUSSION HS-associated volume changes are detectable on MRI earlier than 10 years before death. Based on these findings, volumetric cutoffs could be derived for in vivo differentiation between HS and AD. HIGHLIGHTS Hippocampal atrophy was found in HS+ patients earlier than 10 years before death. These early pre-mortem changes were driven by reduced CA1 and subiculum volumes. Rates of hippocampus and subfield volume decline were independent of HS. In contrast, steeper atrophy rates were associated with AD pathology burden. Differentiation between AD and HS could be facilitated based on these MRI findings.
Collapse
Affiliation(s)
- Diana Ortega-Cruz
- Laboratory for Clinical Neuroscience, Center for Biomedical Technology, Universidad Politécnica de Madrid, IdISSC, 28223, Madrid, Spain
- Alzheimer’s Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Center, 28031, Madrid, Spain
| | - Juan Eugenio Iglesias
- Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, 02129, Boston, MA, USA
- Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology, 02139, Boston, MA, USA
- Centre for Medical Image Computing, University College London, WC1V 6LJ, London, UK
| | - Alberto Rabano
- Alzheimer’s Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Center, 28031, Madrid, Spain
| | - Bryan A. Strange
- Laboratory for Clinical Neuroscience, Center for Biomedical Technology, Universidad Politécnica de Madrid, IdISSC, 28223, Madrid, Spain
- Alzheimer’s Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Center, 28031, Madrid, Spain
| |
Collapse
|
7
|
Garo-Pascual M, Gaser C, Zhang L, Tohka J, Medina M, Strange BA. Brain structure and phenotypic profile of superagers compared with age-matched older adults: a longitudinal analysis from the Vallecas Project. Lancet Healthy Longev 2023; 4:e374-e385. [PMID: 37454673 PMCID: PMC10397152 DOI: 10.1016/s2666-7568(23)00079-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 04/27/2023] [Accepted: 04/27/2023] [Indexed: 07/18/2023] Open
Abstract
BACKGROUND Cognitive abilities, particularly memory, normally decline with age. However, some individuals, often designated as superagers, can reach late life with the memory function of individuals 30 years younger. We aimed to characterise the brain structure of superagers and identify demographic, lifestyle, and clinical factors associated with this phenotype. METHODS We selected cognitively healthy participants from the Vallecas Project longitudinal cohort recruited between Oct 10, 2011, and Jan 14, 2014, aged 79·5 years or older, on the basis of their delayed verbal episodic memory score. Participants were assessed with the Free and Cued Selective Reminding Test and with three non-memory tests (the 15-item version of the Boston Naming Test, the Digit Symbol Substitution Test, and the Animal Fluency Test). Participants were classified as superagers if they scored at or above the mean values for a 50-56-year-old in the Free and Cued Selective Reminding Test and within one standard deviation of the mean or above for their age and education level in the three non-memory tests, or as typical older adults if they scored within one standard deviation of the mean for their age and education level in the Free and Cued Selective Reminding Test. Data acquired as per protocol from up to six yearly follow-ups were used for longitudinal analyses. FINDINGS We included 64 superagers (mean age 81·9 years; 38 [59%] women and 26 [41%] men) and 55 typical older adults (82·4 years; 35 [64%] women and 20 [36%] men). The median number of follow-up visits was 5·0 (IQR 5·0-6·0) for superagers and 5·0 (4·5-6·0) for typical older adults. Superagers exhibited higher grey matter volume cross-sectionally in the medial temporal lobe, cholinergic forebrain, and motor thalamus. Longitudinally, superagers also showed slower total grey matter atrophy, particularly within the medial temporal lobe, than did typical older adults. A machine learning classification including 89 demographic, lifestyle, and clinical predictors showed that faster movement speed (despite no group differences in exercise frequency) and better mental health were the most differentiating factors for superagers. Similar concentrations of dementia blood biomarkers in superager and typical older adult groups suggest that group differences reflect inherent superager resistance to typical age-related memory loss. INTERPRETATION Factors associated with dementia prevention are also relevant for resistance to age-related memory decline and brain atrophy, and the association between superageing and movement speed could provide potential novel insights into how to preserve memory function into the ninth decade. FUNDING Queen Sofia Foundation, CIEN Foundation, Spanish Ministry of Science and Innovation, Alzheimer's Association, European Research Council, MAPFRE Foundation, Carl Zeiss Foundation, and the EU Comission for Horizon 2020. TRANSLATION For the Spanish translation of the abstract see Supplementary Materials section.
Collapse
Affiliation(s)
- Marta Garo-Pascual
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politécnica de Madrid, IdISSC, Madrid, Spain; Alzheimer Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Centre, Madrid, Spain; PhD Program in Neuroscience, Autonomous University of Madrid-Cajal Institute, Madrid, Spain.
| | - Christian Gaser
- Structural Brain Mapping Group, Department of Neurology, Jena University Hospital, Jena, Germany; Department of Psychiatry and Psychotherapy, Jena University Hospital, Jena, Germany; German Centre for Mental Health, Jena, Germany
| | - Linda Zhang
- Alzheimer Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Centre, Madrid, Spain
| | - Jussi Tohka
- A. I. Virtanen Institute for Molecular Sciences, University of Eastern Finland, Kuopio, Finland
| | - Miguel Medina
- Alzheimer Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Centre, Madrid, Spain; Network Centre for Biomedical Research in Neurodegenerative Diseases, Madrid, Spain
| | - Bryan A Strange
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politécnica de Madrid, IdISSC, Madrid, Spain; Alzheimer Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Centre, Madrid, Spain
| |
Collapse
|
8
|
Pascual MG, Gaser C, Strange BA. Brain age estimation by structural MRI in superagers: a BrainAGE approach in elderly people with youthful episodic memory. Alzheimers Dement 2022. [DOI: 10.1002/alz.065438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Marta Garo Pascual
- CIEN Foundation, Queen Sofia Foundation Alzheimer Centre Madrid Spain
- Centre for Biomedical Technology, Universidad Politecnica de Madrid Madrid Spain
- PhD Program in Neuroscience, Autonoma de Madrid University Madrid Spain
| | | | - Bryan A Strange
- CIEN Foundation, Queen Sofia Foundation Alzheimer Centre Madrid Spain
- Centre for Biomedical Technology, Universidad Politecnica de Madrid Madrid Spain
| |
Collapse
|
9
|
Zhang L, Sanchez B, Moldenhauer F, de Asua DR, Brudfors M, Foulon C, del Ser T, Ashburner J, Nachev P, Strange BA. Neuroanatomy of dementia in Down Syndrome revealed using a voxel‐based morphometry approach to computed tomography. Alzheimers Dement 2022. [DOI: 10.1002/alz.062219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Linda Zhang
- CIEN Foundation, Queen Sofia Foundation Alzheimer Centre Madrid Spain
| | | | | | | | - Mikael Brudfors
- Wellcome Centre for Human Neuroimaging, UCL London United Kingdom
| | - Chris Foulon
- UCL Queen Square Institute of Neurology London United Kingdom
| | - Teodoro del Ser
- CIEN Foundation, Queen Sofia Foundation Alzheimer Centre Madrid Spain
| | - John Ashburner
- Wellcome Centre for Human Neuroimaging, UCL London United Kingdom
| | | | - Bryan A Strange
- CIEN Foundation, Queen Sofia Foundation Alzheimer Centre Madrid Spain
- Centre for Biomedical Technology, Universidad Politecnica de Madrid Madrid Spain
| |
Collapse
|
10
|
Ortega‐Cruz D, Uceda‐Heras A, Zhang L, Iglesias JE, Rabano A, Strange BA. Retrospective MRI‐based tracking of hippocampal sclerosis. Alzheimers Dement 2022. [DOI: 10.1002/alz.062116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Diana Ortega‐Cruz
- Centre for Biomedical Technology, Universidad Politecnica de Madrid Madrid Spain
| | | | - Linda Zhang
- CIEN Foundation, Queen Sofia Foundation Alzheimer Centre Madrid Spain
| | - Juan Eugenio Iglesias
- Computer Science and Artificial Intelligence Laboratory, Massachusetts Institute of Technology Cambridge MA USA
- Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School Charlestown MA USA
| | - Alberto Rabano
- CIEN Foundation, Queen Sofia Foundation Alzheimer Centre Madrid Spain
| | - Bryan A Strange
- Centre for Biomedical Technology, Universidad Politecnica de Madrid Madrid Spain
- CIEN Foundation, Queen Sofia Foundation Alzheimer Centre Madrid Spain
| |
Collapse
|
11
|
Zhang L, Sanchez B, Moldenhauer F, de Asua DR, Brudfors M, Foulon C, del Ser T, Ashburner J, Nachev P, Strange BA. Neuroanatomy of dementia in Down Syndrome revealed using a voxel‐based morphometry approach to computed tomography. Alzheimers Dement 2022. [DOI: 10.1002/alz.065754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Linda Zhang
- CIEN Foundation, Queen Sofia Foundation Alzheimer Centre Madrid Spain
| | | | | | | | - Mikael Brudfors
- Wellcome Centre for Human Neuroimaging, UCL London United Kingdom
| | - Chris Foulon
- UCL Queen Square Institute of Neurology London United Kingdom
| | - Teodoro del Ser
- CIEN Foundation, Queen Sofia Foundation Alzheimer Centre Madrid Spain
| | - John Ashburner
- Wellcome Centre for Human Neuroimaging, UCL London United Kingdom
| | | | - Bryan A Strange
- CIEN Foundation, Queen Sofia Foundation Alzheimer Centre Madrid Spain
- Centre for Biomedical Technology, Universidad Politecnica de Madrid Madrid Spain
| |
Collapse
|
12
|
Abstract
New study reveals how various regions of the human cortex connect to the hippocampus along its longer anterior-posterior axis, shedding light on the way this structure is functionally organized.
Collapse
Affiliation(s)
- Bryan A Strange
- Laboratory for Clinical Neuroscience, Center for Biomedical Technology, University Politécnica de MadridMadridSpain
- Reina Sofia Centre for Alzheimer's ResearchMadridSpain
| |
Collapse
|
13
|
Frank D, Garo-Pascual M, Velasquez PAR, Frades B, Peled N, Zhang L, Strange BA. Brain structure and episodic learning rate in cognitively healthy ageing. Neuroimage 2022; 263:119630. [PMID: 36113738 DOI: 10.1016/j.neuroimage.2022.119630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 09/08/2022] [Accepted: 09/12/2022] [Indexed: 10/31/2022] Open
Abstract
Memory normally declines with ageing and these age-related cognitive changes are associated with changes in brain structure. Episodic memory retrieval has been widely studied during ageing, whereas learning has received less attention. Here we examined the neural correlates of episodic learning rate in ageing. Our study sample consisted of 982 cognitively healthy female and male older participants from the Vallecas Project cohort, without a clinical diagnosis of mild cognitive impairment or dementia. The learning rate across the three consecutive recall trials of the verbal memory task (Free and Cued Selective Reminding Test) recall trials was used as a predictor of grey matter (GM) using voxel-based morphometry, and WM microstructure using tract-based spatial statistics on fractional anisotropy (FA) and mean diffusivity (MD) measures. Immediate Recall improved by 1.4 items per trial on average, and this episodic learning rate was faster in women and negatively associated with age. Structurally, hippocampal and anterior thalamic GM volume correlated positively with learning rate. Learning also correlated with the integrity of WM microstructure (high FA and low MD) in an extensive network of tracts including bilateral anterior thalamic radiation, fornix, and long-range tracts. These results suggest that episodic learning rate is associated with key anatomical structures for memory functioning, motivating further exploration of the differential diagnostic properties between episodic learning rate and retrieval in ageing.
Collapse
Affiliation(s)
- Darya Frank
- Laboratory for Clinical Neuroscience, Centro de Tecnología Biomédica, CTB, Universidad Politécnica de Madrid, Madrid 28223, Spain.
| | - Marta Garo-Pascual
- Laboratory for Clinical Neuroscience, Centro de Tecnología Biomédica, CTB, Universidad Politécnica de Madrid, Madrid 28223, Spain; Alzheimer's Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Center, Madrid 28031, Spain; PhD Program in Neuroscience, Autonoma de Madrid University, Madrid 28049, Spain.
| | - Pablo Alejandro Reyes Velasquez
- Laboratory for Clinical Neuroscience, Centro de Tecnología Biomédica, CTB, Universidad Politécnica de Madrid, Madrid 28223, Spain
| | - Belén Frades
- Alzheimer's Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Center, Madrid 28031, Spain
| | - Noam Peled
- Department of Radiology, Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA 02129, USA; Harvard Medical School, Boston, MA 02115, USA
| | - Linda Zhang
- Alzheimer's Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Center, Madrid 28031, Spain
| | - Bryan A Strange
- Laboratory for Clinical Neuroscience, Centro de Tecnología Biomédica, CTB, Universidad Politécnica de Madrid, Madrid 28223, Spain; Alzheimer's Disease Research Unit, CIEN Foundation, Queen Sofia Foundation Alzheimer Center, Madrid 28031, Spain.
| |
Collapse
|
14
|
Soto-León V, Torres-Llacsa M, Mordillo-Mateos L, Carrasco-López C, Pineda-Pardo JA, Velasco AI, Abad-Toribio L, Tornero J, Foffani G, Strange BA, Oliviero A. Static magnetic field stimulation over motor cortex modulates resting functional connectivity in humans. Sci Rep 2022; 12:7834. [PMID: 35551490 PMCID: PMC9098424 DOI: 10.1038/s41598-022-11859-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2021] [Accepted: 04/22/2022] [Indexed: 11/09/2022] Open
Abstract
Focal application of transcranial static magnetic field stimulation (tSMS) over the human motor cortex induces local changes in cortical excitability. Whether tSMS can also induce distant network effects, and how these local and distant effects may vary over time, is currently unknown. In this study, we applied 10 min tSMS over the left motor cortex of healthy subjects using a real/sham parallel design. To measure tSMS effects at the sensori-motor network level, we used resting-state fMRI. Real tSMS, but not sham, reduced functional connectivity within the stimulated sensori-motor network. This effect of tSMS showed time-dependency, returning to sham levels after the first 5 min of fMRI scanning. With 10 min real tSMS over the motor cortex we did not observe effects in other functional networks examined (default mode and visual system networks). In conclusion, 10 min of tSMS over a location within the sensori-motor network reduces functional connectivity within the same functional network.
Collapse
Affiliation(s)
- Vanesa Soto-León
- FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Finca La Peraleda s/n, 45071, Toledo, Spain.
| | - Mabel Torres-Llacsa
- FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Finca La Peraleda s/n, 45071, Toledo, Spain
| | - Laura Mordillo-Mateos
- FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Finca La Peraleda s/n, 45071, Toledo, Spain.,Universidad de Castilla la Mancha, Talavera de la Reina, Toledo, Spain
| | - Carmen Carrasco-López
- FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Finca La Peraleda s/n, 45071, Toledo, Spain.,IoTaP (Internet of Things and People), Malmö University, Malmö, Sweden
| | - José A Pineda-Pardo
- HM CINAC (Centro Integral de Neurociencias Abarca Campal), Hospital Universitario HM Puerta del Sur, HM Hospitales, Madrid, Spain
| | - Ana I Velasco
- Universidad Alfonso X El Sabio, Villanueva de la Cañada, Madrid, Spain
| | | | | | - Guglielmo Foffani
- HM CINAC (Centro Integral de Neurociencias Abarca Campal), Hospital Universitario HM Puerta del Sur, HM Hospitales, Madrid, Spain.,Neural Bioengineering Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain
| | - Bryan A Strange
- Laboratory for Clinical Neuroscience, Centre of Biomedical Technology, Universidad Politécnica de Madrid, Madrid, Spain
| | - Antonio Oliviero
- FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Finca La Peraleda s/n, 45071, Toledo, Spain. .,Hospital Los Madroños, Brunete, Madrid, Spain.
| |
Collapse
|
15
|
Zhang L, Medina M, Strange BA. White matter diffusion abnormalities observed in cognitively normal elderly before conversion to mild cognitive impairment. Alzheimers Dement 2021. [DOI: 10.1002/alz.056431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Linda Zhang
- CIEN Foundation, Queen Sofia Foundation Alzheimer Centre Madrid Spain
| | - Miguel Medina
- Network Centre for Biomedical Research in Neurodegenerative Diseases (CIBERNED), National Institute of Health Carlos III Madrid Spain
| | - Bryan A Strange
- CIEN Foundation, Queen Sofia Foundation Alzheimer Centre Madrid Spain
- Centre for Biomedical Technology, Universidad Politecnica de Madrid Madrid Spain
| |
Collapse
|
16
|
Pascual MG, Zhang L, Strange BA. Cerebral white matter microstructure in superagers: A diffusion MRI study of a population over the age of 80 with youthful episodic memory. Alzheimers Dement 2021. [DOI: 10.1002/alz.053499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Linda Zhang
- CIEN Foundation Queen Sofia Foundation Alzheimer Centre Madrid Spain
| | - Bryan A. Strange
- CIEN Foundation Queen Sofia Foundation Alzheimer Centre Madrid Spain
- Centre for Biomedical Technology Universidad Politecnica de Madrid Madrid Spain
| |
Collapse
|
17
|
Li N, Hollunder B, Baldermann JC, Kibleur A, Treu S, Akram H, Al-Fatly B, Strange BA, Barcia JA, Zrinzo L, Joyce EM, Chabardes S, Visser-Vandewalle V, Polosan M, Kuhn J, Kühn AA, Horn A. A Unified Functional Network Target for Deep Brain Stimulation in Obsessive-Compulsive Disorder. Biol Psychiatry 2021; 90:701-713. [PMID: 34134839 DOI: 10.1016/j.biopsych.2021.04.006] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 03/26/2021] [Accepted: 04/12/2021] [Indexed: 12/25/2022]
Abstract
BACKGROUND Multiple deep brain stimulation (DBS) targets have been proposed for treating intractable obsessive-compulsive disorder (OCD). Here, we investigated whether stimulation effects of different target sites would be mediated by one common or several segregated functional brain networks. METHODS First, seeding from active electrodes of 4 OCD patient cohorts (N = 50) receiving DBS to anterior limb of the internal capsule or subthalamic nucleus zones, optimal functional connectivity profiles for maximal Yale-Brown Obsessive Compulsive Scale improvements were calculated and cross-validated in leave-one-cohort-out and leave-one-patient-out designs. Second, we derived optimal target-specific connectivity patterns to determine brain regions mutually predictive of clinical outcome for both targets and others predictive for either target alone. Functional connectivity was defined using resting-state functional magnetic resonance imaging data acquired in 1000 healthy participants. RESULTS While optimal functional connectivity profiles showed both commonalities and differences between target sites, robust cross-predictions of clinical improvements across OCD cohorts and targets suggested a shared network. Connectivity to the anterior cingulate cortex, insula, and precuneus, among other regions, was predictive regardless of stimulation target. Regions with maximal connectivity to these commonly predictive areas included the insula, superior frontal gyrus, anterior cingulate cortex, and anterior thalamus, as well as the original stereotactic targets. CONCLUSIONS Pinpointing the network modulated by DBS for OCD from different target sites identified a set of brain regions to which DBS electrodes associated with optimal outcomes were functionally connected-regardless of target choice. On these grounds, we establish potential brain areas that could prospectively inform additional or alternative neuromodulation targets for obsessive-compulsive disorder.
Collapse
Affiliation(s)
- Ningfei Li
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Movement Disorders and Neuromodulation Unit, Department of Neurology, Berlin, Germany.
| | - Barbara Hollunder
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Movement Disorders and Neuromodulation Unit, Department of Neurology, Berlin, Germany; Charité - Universitätsmedizin Berlin, Einstein Center for Neurosciences Berlin, Berlin, Germany; Berlin School of Mind and Brain, Faculty of Philosophy, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Juan Carlos Baldermann
- Department of Neurology, Faculty of Medicine and University Hospital Cologne, University of Cologne, Cologne; Department of Psychiatry and Psychotherapy, Faculty of Medicine and University Hospital Cologne, Cologne, Germany
| | - Astrid Kibleur
- Univ. Grenoble Alpes, Inserm, U1216, CHU Grenoble Alpes, Grenoble Institut des Neurosciences (AK, SC, MP), Grenoble; and OpenMind Innovation (AK), Paris, France; OpenMind Innovation, Paris, France
| | - Svenja Treu
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politécnica de Madrid, Madrid, Spain
| | - Harith Akram
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, United Kingdom; National Hospital for Neurology and Neurosurgery, University College London Hospitals NHS Trust (UCLH), London, United Kingdom
| | - Bassam Al-Fatly
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Movement Disorders and Neuromodulation Unit, Department of Neurology, Berlin, Germany
| | - Bryan A Strange
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politécnica de Madrid, Madrid, Spain
| | - Juan A Barcia
- Neurosurgery Department, Hospital Clínico San Carlos, Universidad Complutense de Madrid, Madrid, Spain
| | - Ludvic Zrinzo
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, United Kingdom; National Hospital for Neurology and Neurosurgery, University College London Hospitals NHS Trust (UCLH), London, United Kingdom
| | - Eileen M Joyce
- Department of Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, London, United Kingdom; National Hospital for Neurology and Neurosurgery, University College London Hospitals NHS Trust (UCLH), London, United Kingdom
| | - Stephan Chabardes
- Univ. Grenoble Alpes, Inserm, U1216, CHU Grenoble Alpes, Grenoble Institut des Neurosciences (AK, SC, MP), Grenoble; and OpenMind Innovation (AK), Paris, France
| | | | - Mircea Polosan
- Univ. Grenoble Alpes, Inserm, U1216, CHU Grenoble Alpes, Grenoble Institut des Neurosciences (AK, SC, MP), Grenoble; and OpenMind Innovation (AK), Paris, France
| | - Jens Kuhn
- Department of Psychiatry and Psychotherapy, Faculty of Medicine and University Hospital Cologne, Cologne, Germany; Department of Psychiatry, Psychotherapy and Psychosomatics, Johanniter Hospital Oberhausen, Evangelisches Klinikum Niederrhein, Oberhausen, Germany
| | - Andrea A Kühn
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Movement Disorders and Neuromodulation Unit, Department of Neurology, Berlin, Germany; Charité - Universitätsmedizin Berlin, Einstein Center for Neurosciences Berlin, Berlin, Germany; Berlin School of Mind and Brain, Faculty of Philosophy, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Andreas Horn
- Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Movement Disorders and Neuromodulation Unit, Department of Neurology, Berlin, Germany; Charité - Universitätsmedizin Berlin, Einstein Center for Neurosciences Berlin, Berlin, Germany
| |
Collapse
|
18
|
Treu S, Gonzalez-Rosa JJ, Soto-Leon V, Lozano-Soldevilla D, Oliviero A, Lopez-Sosa F, Reneses-Prieto B, Barcia JA, Strange BA. A ventromedial prefrontal dysrhythmia in obsessive-compulsive disorder is attenuated by nucleus accumbens deep brain stimulation. Brain Stimul 2021; 14:761-770. [PMID: 33984535 DOI: 10.1016/j.brs.2021.04.028] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 04/23/2021] [Accepted: 04/30/2021] [Indexed: 11/29/2022] Open
Abstract
BACKGROUND Obsessive-compulsive disorder (OCD) has consistently been linked to abnormal frontostriatal activity. The electrophysiological disruption in this circuit, however, remains to be characterized. OBJECTIVE/HYPOTHESIS The primary goal of this study was to investigate the neuronal synchronization in OCD patients. We predicted aberrant oscillatory activity in frontal regions compared to healthy control subjects, which would be alleviated by deep brain stimulation (DBS) of the nucleus accumbens (NAc). METHODS We compared scalp EEG recordings from nine patients with OCD treated with NAc-DBS with recordings from healthy controls, matched for age and gender. Within the patient group, EEG activity was compared with DBS turned off vs. stimulation at typical clinical settings (3.5 V, frequency of stimulation 130 Hz, pulse width 60 μs). In addition, intracranial EEG was recorded directly from depth macroelectrodes in the NAc in four OCD patients. RESULTS Cross-frequency coupling between the phase of alpha/low beta oscillations and amplitude of high gamma was significantly increased over midline frontal and parietal electrodes in patients when stimulation was turned off, compared to controls. Critically, in patients, beta (16-25 Hz) -gamma (110-166 Hz) phase amplitude coupling source localized to the ventromedial prefrontal cortex, and was reduced when NAc-DBS was active. In contrast, intracranial EEG recordings showed no beta-gamma phase amplitude coupling. The contribution of non-sinusoidal beta waveforms to this coupling are reported. CONCLUSION We reveal an increased beta-gamma phase amplitude coupling in fronto-central scalp sensors in patients suffering from OCD, compared to healthy controls, which may derive from ventromedial prefrontal regions implicated in OCD and is normalized by DBS of the nucleus accumbens. This aberrant cross-frequency coupling could represent a biomarker of OCD, as well as a target for novel therapeutic approaches.
Collapse
Affiliation(s)
- Svenja Treu
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politécnica de Madrid, Spain.
| | - Javier J Gonzalez-Rosa
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politécnica de Madrid, Spain; University of Cadiz, Institute of Biomedical Research Cadiz (INiBICA), Cádiz, Spain
| | - Vanesa Soto-Leon
- Hospital Nacional de Parapléjicos, FENNSI Group, Hospital Nacional de Parapléjicos, Toledo, Spain
| | - Diego Lozano-Soldevilla
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politécnica de Madrid, Spain
| | - Antonio Oliviero
- Hospital Nacional de Parapléjicos, FENNSI Group, Hospital Nacional de Parapléjicos, Toledo, Spain
| | - Fernando Lopez-Sosa
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politécnica de Madrid, Spain; University of Cadiz, Institute of Biomedical Research Cadiz (INiBICA), Cádiz, Spain
| | - Blanca Reneses-Prieto
- Department of Psychiatry, Hospital Clínico San Carlos, Instituto de Investigación Sanitaria San Carlos, Universidad Complutense de Madrid, Spain
| | - Juan A Barcia
- Department of Neurosurgery, Hospital Clínico San Carlos, Instituto de Investigación Sanitaria San Carlos, Universidad Complutense de Madrid, Spain
| | - Bryan A Strange
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politécnica de Madrid, Spain
| |
Collapse
|
19
|
Lopez-Sosa F, Reneses B, Sanmartino F, Galarza-Vallejo A, Garcia-Albea J, Cruz-Gomez AJ, Yebra M, Oliviero A, Barcia JA, Strange BA, Gonzalez-Rosa JJ. Nucleus Accumbens Stimulation Modulates Inhibitory Control by Right Prefrontal Cortex Activation in Obsessive-Compulsive Disorder. Cereb Cortex 2021; 31:2742-2758. [PMID: 33406245 DOI: 10.1093/cercor/bhaa397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2020] [Revised: 12/03/2020] [Accepted: 12/11/2020] [Indexed: 11/14/2022] Open
Abstract
Inhibitory control is considered a compromised cognitive function in obsessive-compulsive (OCD) patients and likely linked to corticostriatal circuitry disturbances. Here, 9 refractory OCD patients treated with deep brain stimulation (DBS) were evaluated to address the dynamic modulations of large-scale cortical network activity involved in inhibitory control after nucleus accumbens (NAc) stimulation and their relationship with cortical thickness. A comparison of DBS "On/Off" states showed that patients committed fewer errors and exhibited increased intraindividual reaction time variability, resulting in improved goal maintenance abilities and proactive inhibitory control. Visual P3 event-related potentials showed increased amplitudes during Go/NoGo performance. Go and NoGo responses increased cortical activation mainly over the right inferior frontal gyrus and medial frontal gyrus, respectively. Moreover, increased cortical activation in these areas was equally associated with a higher cortical thickness within the prefrontal cortex. These results highlight the critical role of NAc DBS for preferentially modulating the neuronal activity underlying sustained speed responses and inhibitory control in OCD patients and show that it is triggered by reorganizing brain functions to the right prefrontal regions, which may depend on the underlying cortical thinning. Our findings provide updated structural and functional evidence that supports critical dopaminergic-mediated frontal-striatal network interactions in OCD.
Collapse
Affiliation(s)
- Fernando Lopez-Sosa
- Psychophysiology and Neuroimaging Group, Institute of Biomedical Research Cadiz (INiBICA), 11009 Cádiz, Spain.,Laboratory for Clinical Neuroscience, Centre for Biomedical Technology (CTB), Technical University of Madrid (UPM), 28040 Madrid, Spain
| | - Blanca Reneses
- Department of Psychiatry, Health Research Institute of Hospital Clinico San Carlos (IdISSC), Complutense University of Madrid (UCM), 28040 Madrid, Spain
| | | | - Ana Galarza-Vallejo
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology (CTB), Technical University of Madrid (UPM), 28040 Madrid, Spain
| | - Julia Garcia-Albea
- Department of Psychiatry, Health Research Institute of Hospital Clinico San Carlos (IdISSC), Complutense University of Madrid (UCM), 28040 Madrid, Spain
| | - Alvaro J Cruz-Gomez
- Psychophysiology and Neuroimaging Group, Institute of Biomedical Research Cadiz (INiBICA), 11009 Cádiz, Spain
| | - Mar Yebra
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology (CTB), Technical University of Madrid (UPM), 28040 Madrid, Spain.,Department of Neurosurgery, Cedars-Sinai Medical Center, Los Angeles, CA 90048, USA
| | - Antonio Oliviero
- FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, 45004 Toledo, Spain
| | - Juan A Barcia
- Department of Neurosurgery, Health Research Institute of Hospital Clinico San Carlos (IdISSC), Complutense University of Madrid (UCM), 28040 Madrid, Spain
| | - Bryan A Strange
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology (CTB), Technical University of Madrid (UPM), 28040 Madrid, Spain.,Department of Neuroimaging, Alzheimer's Disease Research Centre, Reina Sofia-CIEN Foundation, 28013 Madrid, Spain
| | - Javier J Gonzalez-Rosa
- Psychophysiology and Neuroimaging Group, Institute of Biomedical Research Cadiz (INiBICA), 11009 Cádiz, Spain.,Laboratory for Clinical Neuroscience, Centre for Biomedical Technology (CTB), Technical University of Madrid (UPM), 28040 Madrid, Spain.,Department of Psychology, University of Cadiz. 11003 Cádiz, Spain
| |
Collapse
|
20
|
Prakash M, Abdelaziz M, Zhang L, Strange BA, Tohka J. Quantitative Longitudinal Predictions of Alzheimer's Disease by Multi-Modal Predictive Learning. J Alzheimers Dis 2021; 79:1533-1546. [PMID: 33459714 DOI: 10.3233/jad-200906] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
BACKGROUND Quantitatively predicting the progression of Alzheimer's disease (AD) in an individual on a continuous scale, such as the Alzheimer's Disease Assessment Scale-cognitive (ADAS-cog) scores, is informative for a personalized approach as opposed to qualitatively classifying the individual into a broad disease category. OBJECTIVE To evaluate the hypothesis that the multi-modal data and predictive learning models can be employed for future predicting ADAS-cog scores. METHODS Unimodal and multi-modal regression models were trained on baseline data comprised of demographics, neuroimaging, and cerebrospinal fluid based markers, and genetic factors to predict future ADAS-cog scores for 12, 24, and 36 months. We subjected the prediction models to repeated cross-validation and assessed the resulting mean absolute error (MAE) and cross-validated correlation (ρ) of the model. RESULTS Prediction models trained on multi-modal data outperformed the models trained on single modal data in predicting future ADAS-cog scores (MAE12, 24 & 36 months= 4.1, 4.5, and 5.0, ρ12, 24 & 36 months= 0.88, 0.82, and 0.75). Including baseline ADAS-cog scores to prediction models improved predictive performance (MAE12, 24 & 36 months= 3.5, 3.7, and 4.6, ρ12, 24 & 36 months= 0.89, 0.87, and 0.80). CONCLUSION Future ADAS-cog scores were predicted which could aid clinicians in identifying those at greater risk of decline and apply interventions at an earlier disease stage and inform likely future disease progression in individuals enrolled in AD clinical trials.
Collapse
Affiliation(s)
- Mithilesh Prakash
- University of Eastern Finland, A.I. Virtanen Institute for Molecular Sciences, Kuopio, Finland
| | | | - Linda Zhang
- Department of Neuroimaging, Alzheimer's Disease Research Centre, Reina Sofia-CIEN Foundation, Madrid, Spain
| | - Bryan A Strange
- Department of Neuroimaging, Alzheimer's Disease Research Centre, Reina Sofia-CIEN Foundation, Madrid, Spain.,Laboratory for Clinical Neuroscience, CTB, Universidad Politécnica de Madrid, Madrid, Spain
| | - Jussi Tohka
- University of Eastern Finland, A.I. Virtanen Institute for Molecular Sciences, Kuopio, Finland
| | | |
Collapse
|
21
|
Pascual MG, Zhang L, Defelipe J, Gaser C, Medina M, Strange BA. Neuroanatomical signature of super‐ageing: Structural brain study of youthful episodic memory in people over the age of 80. Alzheimers Dement 2020. [DOI: 10.1002/alz.041915] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Linda Zhang
- CIEN Foundation Queen Sofia Foundation Alzheimer Centre Madrid Spain
| | - Javier Defelipe
- Laboratorio Cajal de Circuitos Corticales Centro de Tecnología Biomédica (CTB) Universidad Politécnica de Madrid (UPM) Pozuelo de Alarcón Spain
| | | | - Miguel Medina
- Network Centre for Biomedical Research in Neurodegenerative Diseases (CIBERNED) National Institute of Health Carlos III Madrid Spain
| | - Bryan A Strange
- Centre for Biomedical Technology Universidad Politecnica de Madrid Madrid Spain
| |
Collapse
|
22
|
Zhang L, Duenas E, Long C, Navas S, Calero M, Medina M, Strange BA. APOE‐ε4 and hippocampal volume in the cognitively healthy elderly: Longitudinal analysis reveals origins of apparent cross‐sectional differences. Alzheimers Dement 2020. [DOI: 10.1002/alz.042680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Linda Zhang
- CIEN Foundation Queen Sofia Foundation Alzheimer Centre Madrid Spain
| | - Eva Duenas
- CIEN Foundation Queen Sofia Foundation Alzheimer Centre Madrid Spain
| | - Christopher Long
- CIEN Foundation Queen Sofia Foundation Alzheimer Centre Madrid Spain
| | - Susana Navas
- CIEN Foundation Queen Sofia Foundation Alzheimer Centre Madrid Spain
| | - Miguel Calero
- Network Centre for Biomedical Research in Neurodegenerative Diseases (CIBERNED) National Institute of Health Carlos III Madrid Spain
- Chronic Disease Programme (UFIEC) National Institute of Health Carlos III Madrid Spain
| | - Miguel Medina
- CIEN Foundation Queen Sofia Foundation Alzheimer Centre Madrid Spain
- Network Centre for Biomedical Research in Neurodegenerative Diseases (CIBERNED) National Institute of Health Carlos III Madrid Spain
| | - Bryan A Strange
- CIEN Foundation Queen Sofia Foundation Alzheimer Centre Madrid Spain
- Centre for Biomedical Technology Universidad Politecnica de Madrid Madrid Spain
| |
Collapse
|
23
|
Bierbrauer A, Kunz L, Gomes CA, Luhmann M, Deuker L, Getzmann S, Wascher E, Gajewski PD, Hengstler JG, Fernandez-Alvarez M, Atienza M, Cammisuli DM, Bonatti F, Pruneti C, Percesepe A, Bellaali Y, Hanseeuw B, Strange BA, Cantero JL, Axmacher N. Unmasking selective path integration deficits in Alzheimer's disease risk carriers. Sci Adv 2020; 6:eaba1394. [PMID: 32923622 PMCID: PMC7455192 DOI: 10.1126/sciadv.aba1394] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 07/15/2020] [Indexed: 05/11/2023]
Abstract
Alzheimer's disease (AD) manifests with progressive memory loss and spatial disorientation. Neuropathological studies suggest early AD pathology in the entorhinal cortex (EC) of young adults at genetic risk for AD (APOE ε4-carriers). Because the EC harbors grid cells, a likely neural substrate of path integration (PI), we examined PI performance in APOE ε4-carriers during a virtual navigation task. We report a selective impairment in APOE ε4-carriers specifically when recruitment of compensatory navigational strategies via supportive spatial cues was disabled. A separate fMRI study revealed that PI performance was associated with the strength of entorhinal grid-like representations when no compensatory strategies were available, suggesting grid cell dysfunction as a mechanistic explanation for PI deficits in APOE ε4-carriers. Furthermore, posterior cingulate/retrosplenial cortex was involved in the recruitment of compensatory navigational strategies via supportive spatial cues. Our results provide evidence for selective PI deficits in AD risk carriers, decades before potential disease onset.
Collapse
Affiliation(s)
- Anne Bierbrauer
- Department of Neuropsychology, Institute of Cognitive Neuroscience, Faculty of Psychology, Ruhr University Bochum, Universitätsstraße 150, 44801 Bochum, Germany
- Corresponding author. (A.B.); (L.K.); (N.A.)
| | - Lukas Kunz
- Epilepsy Center, Medical Center–University of Freiburg, Faculty of Medicine, University of Freiburg, Breisacher Str. 64, 79106 Freiburg im Breisgau, Germany
- Spemann Graduate School of Biology and Medicine (SGBM), University of Freiburg, Freiburg, Germany
- Faculty of Biology, University of Freiburg, Schänzlestraße 1, 79104 Freiburg, Germany
- Corresponding author. (A.B.); (L.K.); (N.A.)
| | - Carlos A. Gomes
- Department of Neuropsychology, Institute of Cognitive Neuroscience, Faculty of Psychology, Ruhr University Bochum, Universitätsstraße 150, 44801 Bochum, Germany
| | - Maike Luhmann
- Faculty of Psychology, Ruhr University Bochum, Bochum, Germany
| | - Lorena Deuker
- Department of Neuropsychology, Institute of Cognitive Neuroscience, Faculty of Psychology, Ruhr University Bochum, Universitätsstraße 150, 44801 Bochum, Germany
| | - Stephan Getzmann
- Leibniz Research Centre for Working Environment and Human Factors (IfADo), Technical University of Dortmund, Dortmund, Germany
| | - Edmund Wascher
- Leibniz Research Centre for Working Environment and Human Factors (IfADo), Technical University of Dortmund, Dortmund, Germany
| | - Patrick D. Gajewski
- Leibniz Research Centre for Working Environment and Human Factors (IfADo), Technical University of Dortmund, Dortmund, Germany
| | - Jan G. Hengstler
- Leibniz Research Centre for Working Environment and Human Factors (IfADo), Technical University of Dortmund, Dortmund, Germany
| | - Marina Fernandez-Alvarez
- Laboratory of Functional Neuroscience, Pablo de Olavide University, Network Center for Biomedical Research in Neurodegenerative Disease (CIBERNED), Seville, Spain
| | - Mercedes Atienza
- Laboratory of Functional Neuroscience, Pablo de Olavide University, Network Center for Biomedical Research in Neurodegenerative Disease (CIBERNED), Seville, Spain
| | - Davide M. Cammisuli
- Department of Medicine and Surgery, Laboratory of Clinical Psychology, Clinical Psychophysiology and Clinical Neuropsychology, University of Parma, Parma, Italy
| | - Francesco Bonatti
- Department of Medicine and Surgery, Medical Genetics, University of Parma, Parma, Italy
| | - Carlo Pruneti
- Department of Medicine and Surgery, Laboratory of Clinical Psychology, Clinical Psychophysiology and Clinical Neuropsychology, University of Parma, Parma, Italy
| | - Antonio Percesepe
- Department of Medicine and Surgery, Medical Genetics, University of Parma, Parma, Italy
| | - Youssef Bellaali
- Department of Neurology, Cliniques Universitaires Saint-Luc, Institute of Neuroscience, Université Catholique de Louvain, Brussels, Belgium
| | - Bernard Hanseeuw
- Department of Neurology, Cliniques Universitaires Saint-Luc, Institute of Neuroscience, Université Catholique de Louvain, Brussels, Belgium
- Gordon Center for Medical Imaging, Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Bryan A. Strange
- Department of Neuroimaging, Alzheimer’s Disease Research Centre, Reina Sofia–CIEN Foundation, Madrid, Spain
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politecnica de Madrid, Madrid, Spain
| | - Jose L. Cantero
- Laboratory of Functional Neuroscience, Pablo de Olavide University, Network Center for Biomedical Research in Neurodegenerative Disease (CIBERNED), Seville, Spain
| | - Nikolai Axmacher
- Department of Neuropsychology, Institute of Cognitive Neuroscience, Faculty of Psychology, Ruhr University Bochum, Universitätsstraße 150, 44801 Bochum, Germany
- State Key Laboratory of Cognitive Neuroscience and Learning and IDG/McGovern Institute for Brain Research, Beijing Normal University, Xinjiekouwai Street 19, Beijing 100875, China
- Corresponding author. (A.B.); (L.K.); (N.A.)
| |
Collapse
|
24
|
Guex R, Méndez-Bértolo C, Moratti S, Strange BA, Spinelli L, Murray RJ, Sander D, Seeck M, Vuilleumier P, Domínguez-Borràs J. Temporal dynamics of amygdala response to emotion- and action-relevance. Sci Rep 2020; 10:11138. [PMID: 32636485 PMCID: PMC7340782 DOI: 10.1038/s41598-020-67862-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2019] [Accepted: 04/06/2020] [Indexed: 11/27/2022] Open
Abstract
It has been proposed that the human amygdala may not only encode the emotional value of sensory events, but more generally mediate the appraisal of their relevance for the individual’s goals, including relevance for action or task-based needs. However, emotional and non-emotional/action-relevance might drive amygdala activity through distinct neural signals, and the relative timing of both kinds of responses remains undetermined. Here, we recorded intracranial event-related potentials from nine amygdalae of patients undergoing epilepsy surgery, while they performed variants of a Go/NoGo task with faces and abstract shapes, where emotion- and action-relevance were orthogonally manipulated. Our results revealed early amygdala responses to emotion facial expressions starting ~ 130 ms after stimulus-onset. Importantly, the amygdala responded to action-relevance not only with face stimuli but also with abstract shapes (squares), and these relevance effects consistently occurred in later time-windows (starting ~ 220 ms) for both faces and squares. A similar dissociation was observed in gamma activity. Furthermore, whereas emotional responses habituated over time, the action-relevance effect increased during the course of the experiment, suggesting progressive learning based on the task needs. Our results support the hypothesis that the human amygdala mediates a broader relevance appraisal function, with the processing of emotion-relevance preceding temporally that of action-relevance.
Collapse
Affiliation(s)
- Raphael Guex
- Laboratory for Behavioral Neurology and Imaging of Cognition, Campus Biotech, University of Geneva, Geneva, Switzerland. .,Pre-surgical Epilepsy Evaluation Unit, Clinic of Neurology, University Hospital, Geneva, Switzerland. .,Swiss Center for Affective Sciences, University of Geneva, Geneva, Switzerland. .,Department of Clinical Neurosciences, University of Geneva, Geneva, Switzerland. .,Laboratory for Behavioral Neurology and Imaging of Cognition, Department of Neuroscience, University Medical Center, 1 Rue Michel-Servet, 1211, Geneva, Switzerland.
| | | | - Stephan Moratti
- Department of Experimental Psychology, Complutense University of Madrid, Madrid, Spain
| | - Bryan A Strange
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politécnica de Madrid, Madrid, Spain.,Department of Neuroimaging, Alzheimer's Disease Research Centre, Reina Sofia-CIEN Foundation, Madrid, Spain
| | - Laurent Spinelli
- Pre-surgical Epilepsy Evaluation Unit, Clinic of Neurology, University Hospital, Geneva, Switzerland
| | - Ryan J Murray
- Swiss Center for Affective Sciences, University of Geneva, Geneva, Switzerland.,Laboratory for the Study of Emotion Elicitation and Expression, Department of Psychology, University of Geneva, Geneva, Switzerland
| | - David Sander
- Swiss Center for Affective Sciences, University of Geneva, Geneva, Switzerland.,Laboratory for the Study of Emotion Elicitation and Expression, Department of Psychology, University of Geneva, Geneva, Switzerland
| | - Margitta Seeck
- Pre-surgical Epilepsy Evaluation Unit, Clinic of Neurology, University Hospital, Geneva, Switzerland
| | - Patrik Vuilleumier
- Laboratory for Behavioral Neurology and Imaging of Cognition, Campus Biotech, University of Geneva, Geneva, Switzerland.,Swiss Center for Affective Sciences, University of Geneva, Geneva, Switzerland
| | - Judith Domínguez-Borràs
- Laboratory for Behavioral Neurology and Imaging of Cognition, Campus Biotech, University of Geneva, Geneva, Switzerland.,Swiss Center for Affective Sciences, University of Geneva, Geneva, Switzerland.,Department of Clinical Neurosciences, University of Geneva, Geneva, Switzerland.,Department of Clinical Psychology and Psychobiology, University of Barcelona, Barcelona, Spain
| |
Collapse
|
25
|
Fijtman A, Bücker J, Strange BA, Martins DS, Passos IC, Hasse-Sousa M, Lima FM, Kapczinski F, Yatham L, Kauer-Sant'Anna M. Emotional memory in bipolar disorder: Impact of multiple episodes and childhood trauma. J Affect Disord 2020; 260:206-213. [PMID: 31505398 DOI: 10.1016/j.jad.2019.09.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 07/07/2019] [Accepted: 09/01/2019] [Indexed: 11/28/2022]
Abstract
BACKGROUND Emotional memory is a critical amygdala-dependent cognitive function characterized by enhanced memory for emotional events coupled with retrograde amnesia. Our study aims to assess the influence of bipolar disorder (BD), trauma, and the number of mood episodes on emotional memory. METHODS 53 subjects (33 euthymic patients with BD and 20 healthy controls) answered a clinical assessment, childhood trauma questionnaire (CTQ), and an emotional memory test composed of lists of nouns, including neutral words, one emotional (E), one preceding (E-1) and one following word (E + 1). We assessed for the influence of type, position, diagnosis, trauma, and number of mood episodes in word recall using generalized estimating equations. RESULTS Controlling for neutral words, BD had a higher recall for E-1 (p = 0.038) and a trend for a higher recall of E (p = 0.055). There was no difference between patients with and without trauma. Patients with BD who suffered multiple mood episodes had a higher recall of E compared to patients with fewer episodes (p = 0.016). LIMITATIONS Cross-sectional design and small sample size. CONCLUSION Our results indicate dysfunction in emotional memory in patients with BD, particularly after multiple mood episodes. While we expected an impaired emotional memory, patients with BD showed an increased recall for emotional stimuli and events preceding them. Childhood trauma does not seem to interfere with emotional memory changes in patients with BD. Emotional memory enhancement seems to be a promising marker of progression in BD.
Collapse
Affiliation(s)
- Adam Fijtman
- Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil; Department of Psychiatry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil.
| | - Joana Bücker
- Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil; Department of Psychiatry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Bryan A Strange
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politécnica de Madrid, Spain
| | - Dayane Santos Martins
- Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil; Department of Psychiatry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Ives Cavalcante Passos
- Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil; Department of Psychiatry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Mathias Hasse-Sousa
- Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil; Department of Psychiatry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Flavia Moreira Lima
- Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil; Department of Psychiatry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| | - Flavio Kapczinski
- Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil; Department of Psychiatry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil; Neuroscience Graduate Program, McMaster University, 100 West Fifth Street, Hamilton, ON, Canada
| | - Lakshmi Yatham
- Department of Psychiatry, University of British Columbia, Vancouver, Canada
| | - Márcia Kauer-Sant'Anna
- Laboratory of Molecular Psychiatry, Hospital de Clínicas de Porto Alegre (HCPA), Federal University of Rio Grande do Sul, Porto Alegre, Brazil; Department of Psychiatry, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, Brazil
| |
Collapse
|
26
|
Pineda-Pardo JA, Obeso I, Guida P, Dileone M, Strange BA, Obeso JA, Oliviero A, Foffani G. Static magnetic field stimulation of the supplementary motor area modulates resting-state activity and motor behavior. Commun Biol 2019; 2:397. [PMID: 31701026 PMCID: PMC6823375 DOI: 10.1038/s42003-019-0643-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Accepted: 09/10/2019] [Indexed: 12/12/2022] Open
Abstract
Focal application of a strong static magnetic field over the human scalp induces measurable local changes in brain function. Whether it also induces distant effects across the brain and how these local and distant effects collectively affect motor behavior remains unclear. Here we applied transcranial static magnetic field stimulation (tSMS) over the supplementary motor area (SMA) in healthy subjects. At a behavioral level, tSMS increased the time to initiate movement while decreasing errors in choice reaction-time tasks. At a functional level, tSMS increased SMA resting-state fMRI activity and bilateral functional connectivity between the SMA and both the paracentral lobule and the lateral frontotemporal cortex, including the inferior frontal gyrus. These results suggest that tSMS over the SMA can induce behavioral aftereffects associated with modulation of both local and distant functionally-connected cortical circuits involved in the control of speed-accuracy tradeoffs, thus offering a promising protocol for cognitive and clinical research.
Collapse
Affiliation(s)
- José A. Pineda-Pardo
- CINAC, Hospital Universitario HM Puerta del Sur, Móstoles, Universidad CEU-San Pablo, Madrid, Spain
| | - Ignacio Obeso
- CINAC, Hospital Universitario HM Puerta del Sur, Móstoles, Universidad CEU-San Pablo, Madrid, Spain
| | - Pasqualina Guida
- CINAC, Hospital Universitario HM Puerta del Sur, Móstoles, Universidad CEU-San Pablo, Madrid, Spain
| | - Michele Dileone
- CINAC, Hospital Universitario HM Puerta del Sur, Móstoles, Universidad CEU-San Pablo, Madrid, Spain
| | - Bryan A. Strange
- Laboratory for Clinical Neuroscience, CTB, Universidad Politecnica de Madrid, Madrid, Spain
- Department of Neuroimaging, Alzheimer’s Disease Research Centre, Reina Sofia-CIEN Foundation, Madrid, Spain
| | - José A. Obeso
- CINAC, Hospital Universitario HM Puerta del Sur, Móstoles, Universidad CEU-San Pablo, Madrid, Spain
- CIBERNED, Instituto de Salud Carlos III, Madrid, Spain
| | | | - Guglielmo Foffani
- CINAC, Hospital Universitario HM Puerta del Sur, Móstoles, Universidad CEU-San Pablo, Madrid, Spain
- Hospital Nacional de Parapléjicos, Toledo, Spain
| |
Collapse
|
27
|
Yebra M, Galarza-Vallejo A, Soto-Leon V, Gonzalez-Rosa JJ, de Berker AO, Bestmann S, Oliviero A, Kroes MCW, Strange BA. Action boosts episodic memory encoding in humans via engagement of a noradrenergic system. Nat Commun 2019; 10:3534. [PMID: 31388000 PMCID: PMC6684634 DOI: 10.1038/s41467-019-11358-8] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Accepted: 07/10/2019] [Indexed: 11/09/2022] Open
Abstract
We are constantly interacting with our environment whilst we encode memories. However, how actions influence memory formation remains poorly understood. Goal-directed movement engages the locus coeruleus (LC), the main source of noradrenaline in the brain. Noradrenaline is also known to enhance episodic encoding, suggesting that action could improve memory via LC engagement. Here we demonstrate, across seven experiments, that action (Go-response) enhances episodic encoding for stimuli unrelated to the action itself, compared to action inhibition (NoGo). Functional magnetic resonance imaging, and pupil diameter as a proxy measure for LC-noradrenaline transmission, indicate increased encoding-related LC activity during action. A final experiment, replicated in two independent samples, confirmed a novel prediction derived from these data that emotionally aversive stimuli, which recruit the noradrenergic system, modulate the mnemonic advantage conferred by Go-responses relative to neutral stimuli. We therefore provide converging evidence that action boosts episodic memory encoding via a noradrenergic mechanism.
Collapse
Affiliation(s)
- Mar Yebra
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politecnica de Madrid, Campus Montegancedo, Madrid, Spain.
- Cedars-Sinai 127S. San Vicente Blvd, Advanced Health Sciences Pavilion, 6th Floor, Los Angeles, CA, 90048, USA.
| | - Ana Galarza-Vallejo
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politecnica de Madrid, Campus Montegancedo, Madrid, Spain
| | - Vanesa Soto-Leon
- Hospital Nacional de Parapléjicos, FENNSI Group, Hospital Nacional de parapléjicos Finca la Peraleda s/n 45004, Toledo, Spain
| | - Javier J Gonzalez-Rosa
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politecnica de Madrid, Campus Montegancedo, Madrid, Spain
- University of Cadiz, Institute of Biomedical Research Cadiz (INiBICA), Puerta del Mar Hospital, Research Unit, Lab 3, 9th floor, Av. Ana de Viya, 21, 11009, Cádiz, Spain
| | - Archy O de Berker
- Dept Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, University College London, 33 Queen Square WC1N3BG, London, UK
| | - Sven Bestmann
- Dept Clinical and Movement Neurosciences, UCL Queen Square Institute of Neurology, University College London, 33 Queen Square WC1N3BG, London, UK
| | - Antonio Oliviero
- Hospital Nacional de Parapléjicos, FENNSI Group, Hospital Nacional de parapléjicos Finca la Peraleda s/n 45004, Toledo, Spain
| | - Marijn C W Kroes
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politecnica de Madrid, Campus Montegancedo, Madrid, Spain
- Donders Institute for Brain, Cognition, and Behaviour, Radboud University Nijmegen Medical Center, Kapittelweg 29, 6500 HB, Nijmegen, The Netherlands
| | - Bryan A Strange
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politecnica de Madrid, Campus Montegancedo, Madrid, Spain
- Department of Neuroimaging, Alzheimer's Disease Research Centre, Reina Sofia-CIEN Foundation, Calle de Valderrebollo, 5, 28031, Madrid, Spain
| |
Collapse
|
28
|
Galarza Vallejo A, Kroes MCW, Rey E, Acedo MV, Moratti S, Fernández G, Strange BA. Propofol-induced deep sedation reduces emotional episodic memory reconsolidation in humans. Sci Adv 2019; 5:eaav3801. [PMID: 30906867 PMCID: PMC6426467 DOI: 10.1126/sciadv.aav3801] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 01/31/2019] [Indexed: 05/29/2023]
Abstract
The adjustment of maladaptive thoughts and behaviors associated with emotional memories is central to treating psychiatric disorders. Recent research, predominantly with laboratory animals, indicates that memories can become temporarily sensitive to modification following reactivation, before undergoing reconsolidation. A method to selectively impair reconsolidation of specific emotional or traumatic memories in humans could translate to an effective treatment for conditions such as posttraumatic stress disorder. We tested whether deep sedation could impair emotional memory reconsolidation in 50 human participants. Administering the intravenous anesthetic propofol following memory reactivation disrupted memory for the reactivated, but not for a non-reactivated, slideshow story. Propofol impaired memory for the reactivated story after 24 hours, but not immediately after propofol recovery. Critically, memory impairment occurred selectively for the emotionally negative phase of the reactivated story. One dose of propofol following memory reactivation selectively impaired subsequent emotional episodic memory retrieval in a time-dependent manner, consistent with reconsolidation impairment.
Collapse
Affiliation(s)
- Ana Galarza Vallejo
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politécnica de Madrid, Spain
| | - Marijn C. W. Kroes
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politécnica de Madrid, Spain
- Department of Psychology and Center for Neural Science, New York University, New York, NY, USA
- Donders Institute for Brain, Cognition, and Behaviour, Donders Institute, Radboud University Medical Centre, Nijmegen 6525 EZ, Netherlands
| | - Enrique Rey
- Department of Gastroenterology, Hospital Clínico San Carlos and Instituto de Investigación Sanitaria San Carlos, Universidad Complutense de Madrid, Spain
| | - Maria Victoria Acedo
- Department of Anesthesia, Hospital Clínico San Carlos, Instituto de Investigación Sanitaria San Carlos, Universidad Complutense de Madrid, Spain
| | - Stephan Moratti
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politécnica de Madrid, Spain
- Department of Basic Psychology I, Complutense University of Madrid, Spain
| | - Guillén Fernández
- Donders Institute for Brain, Cognition, and Behaviour, Donders Institute, Radboud University Medical Centre, Nijmegen 6525 EZ, Netherlands
| | - Bryan A. Strange
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politécnica de Madrid, Spain
- Department of Neuroimaging, Alzheimer’s Disease Research Centre, Reina Sofia–CIEN Foundation, Madrid, Spain
| |
Collapse
|
29
|
Barcia JA, Avecillas-Chasín JM, Nombela C, Arza R, García-Albea J, Pineda-Pardo JA, Reneses B, Strange BA. Personalized striatal targets for deep brain stimulation in obsessive-compulsive disorder. Brain Stimul 2018; 12:724-734. [PMID: 30670359 DOI: 10.1016/j.brs.2018.12.226] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Revised: 12/05/2018] [Accepted: 12/15/2018] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Psychiatric conditions currently treated with deep brain stimulation (DBS), such as obsessive-compulsive disorder (OCD), are heterogeneous diseases with different symptomatic dimensions, indicating that fixed neuroanatomical DBS targets for all OCD cases may not be efficacious. OBJECTIVE/HYPOTHESIS We tested whether the optimal DBS target for OCD is fixed for all patients or whether it is individualized and related to each patient's symptomatic content. Further, we explored if the optimal target can be predicted by combining functional neuroimaging and structural connectivity. METHODS In a prospective, randomized, double-blinded study in 7 OCD patients, symptomatic content was characterized pre-operatively by clinical interview and OCD symptom-provocation during functional MRI. DBS electrode implantation followed a trajectory placing 4 contacts along a striatal axis (nucleus accumbens to caudate). Patients underwent three-month stimulation periods for each contact (and sham), followed by clinical evaluation. Probabilistic tractography, applied to diffusion-weighted images acquired pre-operatively, was used to study the overlap between projections from the prefrontal areas activated during symptom provocation and the volume of activated tissue of each electrode contact. RESULTS Six patients were classified responders, with median symptomatic reduction of 50% achieved from each patient's best contact. This was located at the caudate in 4 cases and at the accumbens in 2. Critically, the anatomical locus of the best contact (accumbens or caudate) was related to an index derived by combining functional MRI responses to prevailing symptom provocation and prefronto-cortico-striatal projections defined by probabilistic tractography. CONCLUSION Our results therefore represent a step towards personalized, content-specific DBS targets for OCD.
Collapse
Affiliation(s)
- Juan A Barcia
- Service of Neurosurgery, Hospital Clinico San Carlos, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos, Madrid, Spain; Department of Surgery, Universidad Complutense de Madrid, Madrid, Spain.
| | - Josué M Avecillas-Chasín
- Service of Neurosurgery, Hospital Clinico San Carlos, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos, Madrid, Spain
| | - Cristina Nombela
- Service of Neurosurgery, Hospital Clinico San Carlos, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos, Madrid, Spain
| | - Rocío Arza
- Service of Neurosurgery, Hospital Clinico San Carlos, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos, Madrid, Spain
| | - Julia García-Albea
- Service of Psychiatry, Hospital Clinico San Carlos, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos, Madrid, Spain
| | - José A Pineda-Pardo
- CINAC, HM Puerta del Sur, Hospitales de Madrid, Mostoles, and CEU-San Pablo University, Madrid, Spain
| | - Blanca Reneses
- Service of Psychiatry, Hospital Clinico San Carlos, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos, Madrid, Spain
| | - Bryan A Strange
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Universidad Politecnica de Madrid, Spain; Department of Neuroimaging, Reina Sofia Centre for Alzheimer's Disease, Madrid, Spain
| |
Collapse
|
30
|
Lozano-Soto E, Soto-León V, Sabbarese S, Ruiz-Alvarez L, Sanchez-del-Rio M, Aguilar J, Strange BA, Foffani G, Oliviero A. Transcranial static magnetic field stimulation (tSMS) of the visual cortex decreases experimental photophobia. Cephalalgia 2017; 38:1493-1497. [DOI: 10.1177/0333102417736899] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Background Transcranial static magnetic field stimulation (tSMS) reduces cortical excitability in humans. Methods The objective of this study was to determine whether tSMS over the occipital cortex is effective in reducing experimental photophobia. In a sham-controlled double-blind crossover study, tSMS (or sham) was applied for 10 minutes with a cylindrical magnet on the occiput of 20 healthy subjects. We assessed subjective discomfort induced by low-intensity and high-intensity visual stimuli presented in a dark room before, during and after tSMS (or sham). Results Compared to sham, tSMS significantly reduced the discomfort induced by high-intensity light stimuli. Conclusions The visual cortex may contribute to visual discomfort in experimental photophobia, providing a rationale for investigating tSMS as a possible treatment for photophobia in migraine.
Collapse
Affiliation(s)
- Elena Lozano-Soto
- FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain
| | - Vanesa Soto-León
- FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain
| | - Simona Sabbarese
- FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain
| | - Lara Ruiz-Alvarez
- FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain
- Neurology Service, Hospital del Henares. Coslada, Madrid, Spain
| | | | - Juan Aguilar
- Experimental Neurophysiology Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain
| | - Bryan A Strange
- Laboratory for Clinical Neuroscience, CTB, Universidad Politecnica de Madrid, Madrid, Spain
- Department of Neuroimaging, Alzheimer’s Disease Research Centre, Reina Sofia-CIEN Foundation, Madrid, Spain
| | - Guglielmo Foffani
- HM CINAC, Hospital Universitario HM Puerta del Sur, Universidad CEU-San Pablo, Madrid, Spain
- Neural Bioengineering Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain
| | - Antonio Oliviero
- FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain
| |
Collapse
|
31
|
Méndez-Bértolo C, Moratti S, Toledano R, Lopez-Sosa F, Martínez-Alvarez R, Mah YH, Vuilleumier P, Gil-Nagel A, Strange BA. A fast pathway for fear in human amygdala. Nat Neurosci 2016; 19:1041-9. [DOI: 10.1038/nn.4324] [Citation(s) in RCA: 208] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Accepted: 05/12/2016] [Indexed: 11/09/2022]
|
32
|
Avila J, Perry G, Strange BA, Hernandez F. Alternative neural circuitry that might be impaired in the development of Alzheimer disease. Front Neurosci 2015; 9:145. [PMID: 25954151 PMCID: PMC4407584 DOI: 10.3389/fnins.2015.00145] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 04/08/2015] [Indexed: 11/13/2022] Open
Abstract
It is well established that some individuals with normal cognitive capacity have abundant senile plaques in their brains. It has been proposed that those individuals are resilient or have compensation factors to prevent cognitive decline. In this comment, we explore an alternative mechanism through which cognitive capacity is maintained. This mechanism could involve the impairment of alternative neural circuitry. Also, the proportion of molecules such as Aβ or tau protein present in different areas of the brain could be important.
Collapse
Affiliation(s)
- Jesus Avila
- Neurobiology, Centro de Biologia Molecular Severo Ochoa (CSIC-UAM) Madrid, Spain ; Centro de Investigacion Biomedica en Red de Enfermedades Neurodegenerativas Madrid, Spain
| | - George Perry
- College of Sciences, The University of Texas at San Antonio San Antonio, TX, USA
| | - Bryan A Strange
- Department of Neuroimaging, Reina Sofia Foundation, Center for Alzheimer Research, FCIEN Madrid, Spain ; Laboratory for Clinical Neuroscience, CTB, Universidad Politecnica de Madrid Madrid, Spain
| | - Felix Hernandez
- Neurobiology, Centro de Biologia Molecular Severo Ochoa (CSIC-UAM) Madrid, Spain ; Centro de Investigacion Biomedica en Red de Enfermedades Neurodegenerativas Madrid, Spain
| |
Collapse
|
33
|
Kroes MCW, Tendolkar I, van Wingen GA, van Waarde JA, Strange BA, Fernández G. An electroconvulsive therapy procedure impairs reconsolidation of episodic memories in humans. Nat Neurosci 2013; 17:204-6. [DOI: 10.1038/nn.3609] [Citation(s) in RCA: 112] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Accepted: 11/26/2013] [Indexed: 11/10/2022]
|
34
|
Moratti S, Méndez-Bértolo C, Del-Pozo F, Strange BA. Dynamic gamma frequency feedback coupling between higher and lower order visual cortices underlies perceptual completion in humans. Neuroimage 2013; 86:470-9. [PMID: 24185019 DOI: 10.1016/j.neuroimage.2013.10.037] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Revised: 09/29/2013] [Accepted: 10/18/2013] [Indexed: 11/29/2022] Open
Abstract
To perceive a coherent environment, incomplete or overlapping visual forms must be integrated into meaningful coherent percepts, a process referred to as "Gestalt" formation or perceptual completion. Increasing evidence suggests that this process engages oscillatory neuronal activity in a distributed neuronal assembly. A separate line of evidence suggests that Gestalt formation requires top-down feedback from higher order brain regions to early visual cortex. Here we combine magnetoencephalography (MEG) and effective connectivity analysis in the frequency domain to specifically address the effective coupling between sources of oscillatory brain activity during Gestalt formation. We demonstrate that perceptual completion of two-tone "Mooney" faces induces increased gamma frequency band power (55-71Hz) in human early visual, fusiform and parietal cortices. Within this distributed neuronal assembly fusiform and parietal gamma oscillators are coupled by forward and backward connectivity during Mooney face perception, indicating reciprocal influences of gamma activity between these higher order visual brain regions. Critically, gamma band oscillations in early visual cortex are modulated by top-down feedback connectivity from both fusiform and parietal cortices. Thus, we provide a mechanistic account of Gestalt perception in which gamma oscillations in feature sensitive and spatial attention-relevant brain regions reciprocally drive one another and convey global stimulus aspects to local processing units at low levels of the sensory hierarchy by top-down feedback. Our data therefore support the notion of inverse hierarchical processing within the visual system underlying awareness of coherent percepts.
Collapse
Affiliation(s)
- S Moratti
- Department of Basic Psychology I, Complutense University of Madrid (UCM), 28223 Pozuelo de Alarcón, Madrid, Spain; Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Technical University of Madrid (UPM), Campus Montegancedo, 28223 Pozuelo de Alarcón, Madrid, Spain.
| | - C Méndez-Bértolo
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Technical University of Madrid (UPM), Campus Montegancedo, 28223 Pozuelo de Alarcón, Madrid, Spain; CEI Campus Moncloa, UCM-UPM, Avenida Complutense s/n, 28040 Madrid, Spain
| | - F Del-Pozo
- Laboratory for Cognitive and Computational Neuroscience, Centre for Biomedical Technology, Technical University of Madrid (UPM), Campus Montegancedo, 28223 Pozuelo de Alarcón, Madrid, Spain
| | - B A Strange
- Laboratory for Clinical Neuroscience, Centre for Biomedical Technology, Technical University of Madrid (UPM), Campus Montegancedo, 28223 Pozuelo de Alarcón, Madrid, Spain
| |
Collapse
|
35
|
Toledano R, Jiménez-Huete A, García-Morales I, Campo P, Poch C, Strange BA, Gil-Nagel A. Aphasic seizures in patients with temporopolar and anterior temporobasal lesions: a video-EEG study. Epilepsy Behav 2013. [PMID: 23973642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
Abstract
Studies of patients with temporal lobe epilepsy provide few descriptions of seizures that arise in the temporopolar and the anterior temporobasal brain region. Based on connectivity, it might be assumed that the semiology of these seizures is similar to that of medial temporal lobe epilepsy. However, accumulating evidence suggests that the anterior temporobasal cortex may play an important role in the language system, which could account for particular features of seizures arising here. We studied the electroclinical features of seizures in patients with circumscribed temporopolar and temporobasal lesions in order to identify specific features that might differentiate them from seizures that originate in other temporal areas. Among 172 patients with temporal lobe seizures registered in our epilepsy unit in the last 15 years, 15 (8.7%) patients had seizures caused by temporopolar or anterior temporobasal lesions (11 left-sided lesions). The main finding in our study is that patients with left-sided lesions had aphasia during their seizures as the most prominent feature. In addition, while all patients showed normal to high intellectual functioning in standard neuropsychological testing, semantic impairment was found in a subset of 9 patients with left-sided lesions. This case series demonstrates that aphasic seizures without impairment of consciousness can result from small, circumscribed left anterior temporobasal and temporopolar lesions. Thus, the presence of speech manifestation during seizures should prompt detailed assessment of the structural integrity of the basal surface of the temporal lobe in addition to the evaluation of primary language areas.
Collapse
Affiliation(s)
- Rafael Toledano
- Epilepsy Unit, Department of Neurology, Hospital Ruber Internacional, Madrid, Spain.
| | | | | | | | | | | | | |
Collapse
|
36
|
Abstract
Reconsolidation postulates that reactivation of a memory trace renders it susceptible to disruption by treatments similar to those that impair initial memory consolidation. Despite evidence that implicit, or non-declarative, human memories can be disrupted at retrieval, a convincing demonstration of selective impairment in retrieval of target episodic memories following reactivation is lacking. In human subjects, we demonstrate that if reactivation of a verbal memory, through successful retrieval, is immediately followed by an emotionally aversive stimulus, a significant impairment is evident in its later recall. This effect is time-dependent and persists for at least 6 days. Thus, in line with a reconsolidation hypothesis, established human episodic memories can be selectively impaired following their retrieval.
Collapse
Affiliation(s)
- Bryan A Strange
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology London, UK
| | | | | | | |
Collapse
|
37
|
Moran RJ, Campo P, Maestu F, Reilly RB, Dolan RJ, Strange BA. Peak frequency in the theta and alpha bands correlates with human working memory capacity. Front Hum Neurosci 2010; 4:200. [PMID: 21206531 PMCID: PMC3009479 DOI: 10.3389/fnhum.2010.00200] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2010] [Accepted: 10/01/2010] [Indexed: 11/13/2022] Open
Abstract
Theta oscillations in the local field potential of neural ensembles are considered key mediators of human working memory. Theoretical accounts arising from animal hippocampal recordings propose that the phase of theta oscillations serves to instantiate sequential neuronal firing to form discrete representations of items held online. Human evidence of phase relationships in visual working memory has enhanced this theory, implicating long theta cycles in supporting greater memory capacity. Here we use human magnetoencephalographic recordings to examine a novel, alternative principle of theta functionality. The principle we hypothesize is derived from information theory and predicts that rather than long (low frequency) theta cycles, short (high frequency) theta cycles are best suited to support high information capacity. From oscillatory activity recorded during the maintenance period of a visual working memory task we show that a network of brain regions displays an increase in peak 4-12 Hz frequency with increasing memory load. Source localization techniques reveal that this network comprises bilateral prefrontal and right parietal cortices. Further, the peak of oscillation along this theta-alpha frequency axis is significantly higher in high capacity individuals compared to low capacity individuals. Importantly while we observe the adherence of cortical neuronal oscillations to our novel principle of theta functioning, we also observe the traditional inverse effect of low frequency theta maintaining high loads, where critically this was located in medial temporal regions suggesting parallel, dissociable hippocampal-centric, and prefrontal-centric theta mechanisms.
Collapse
Affiliation(s)
- Rosalyn J Moran
- Wellcome Trust Centre for Neuroimaging, University College London London, UK
| | | | | | | | | | | |
Collapse
|
38
|
Strange BA, Gartmann N, Brenninkmeyer J, Reif A, Kalisch R, Buechel C. Dopamine receptor 4 polymorphism modulates human memory and neuronal responses to novelty. Neuroimage 2009. [DOI: 10.1016/s1053-8119(09)70504-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
|
39
|
Abstract
INTRODUCTION Norepinephrine (NE) has a regulatory role in human attention. OBJECTIVE To examine its role in emotional modulation of attention, we used an attentional blink (AB) paradigm, in the context of psychopharmacological manipulation, where targets were either emotional or neutral items. RESULTS AND DISCUSSION We report behavioural evidence that beta-adrenergic blockade with propranolol impairs attention independent of target valence. Furthermore, this effect is centrally mediated as administration of the peripheral beta-adrenergic antagonist nadolol did not impair attention. By contrast, increasing NE tone, using the selective NE reuptake inhibitor reboxetine, improves detection of emotional stimuli. CONCLUSION In line with theoretical and animal models, these findings provide human behavioural evidence that the adrenergic system has a modulatory influence on selective attention that in some instances depends on item valence.
Collapse
Affiliation(s)
- Benedetto De Martino
- Functional Imaging Laboratory, Institute of Neurology, Wellcome Trust Centre for Neuroimaging, 12 Queen Square, London, WC1N 3BG, UK.
| | | | | |
Collapse
|
40
|
Abstract
Detection of salient or motivationally significant stimuli is of adaptive importance. The neurophysiological correlates of this detection have been extensively studied in 'oddball' paradigms. Much theoretical data supports the role of noradrenergic systems in generating oddball responses. We combine psychopharmacology and functional neuroimaging to demonstrate modulation of neuronal responses to oddball nouns by the β-adrenergic antagonist propranolol. Critically, responses in regions implicated in oddball detection, namely right ventrolateral prefrontal cortex and temporoparietal junction (TPJ), were abolished by propranolol. Thus, oddball responses depend on modulatory adrenergic inputs, mediated via β-adrenergic receptors.
Collapse
Affiliation(s)
- Bryan A Strange
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, 12 Queen Square, London WC1N 3BG, UK
- Centre for Clinical Pharmacology and Therapeutics, Division of Medicine, University College London, London, UK
| | - Raymond J Dolan
- Wellcome Trust Centre for Neuroimaging, Institute of Neurology, 12 Queen Square, London WC1N 3BG, UK
| |
Collapse
|
41
|
Abstract
INTRODUCTION To survive, an organism must remember occurrences of value in its environment. These include those that pose a threat to survival, novel or unexpected stimuli, or a general class of stimuli that represent punishment or reward. There is substantial evidence that memory for novel and emotionally salient events is enhanced relative to familiar or emotionally neutral events. METHODS We present human functional magnetic resonance imaging (fMRI) experiments that address the neurobiological processes underlying upregulation of memory for novel or emotional events. RESULTS Enhanced memory for novel or unexpected stimuli is mediated by anterior hippocampus, whereas increased memory for emotional stimuli is mediated by a beta-adrenergic-dependent modulation of amygdala-hippocampal interactions. We introduce a hypothesis that medial temporal connectivity with autonomic control centres may be central to this memory enhancement. CONCLUSION Enhanced memory for stimuli that are of adaptive importance to survival is mediated by the anterior medial temporal lobe and effected via connections with the autonomic system.
Collapse
|
42
|
Abstract
BACKGROUND An optimal technique for clinical memory fMRI is not established. Previous studies suggest activity in right parahippocampal gyrus and right hippocampus shows the strongest difference between left hippocampal sclerosis (HS) patients and normal control subjects and that the difference in activity between left and right hippocampus predicts postoperative memory change. METHODS The authors studied 30 patients with mesial temporal lobe epilepsy (mTLE) and left HS, 12 of whom subsequently underwent surgery, and 13 normal control subjects. The patients who had surgery underwent neuropsychometric evaluation pre- and postoperatively. All subjects underwent a verbal memory encoding event-related fMRI study. Activation maps were assessed visually. Subsequently, the brain regions involved in the memory task were revealed by group averaging; these regions were used to determine regions of interest (ROIs) for subsequent analysis. By use of stepwise discriminant function and stepwise multiple regression, the ROIs that optimally discriminated between patients and normal control subjects and that optimally predicted postoperative verbal memory outcome were determined. RESULTS Visual inspection of individual patient activation statistic maps revealed noisy data that did not afford visual interpretation. Stepwise discriminant function revealed the difference between left and right hippocampal activity best discriminated between patients and normal control subjects. Stepwise multiple regression revealed left hippocampal activity was the strongest predictor of postoperative verbal memory outcome; greater left hippocampal activity predicted a greater postoperative decline in memory. CONCLUSIONS Patients with left hippocampal sclerosis (HS) differ from normal control subjects in the distribution of memory-encoding activity between left and right hippocampus. Functional adequacy of left hippocampus best predicts postoperative memory outcome in left HS.
Collapse
Affiliation(s)
- Mark P Richardson
- Department of Clinical and Experimental Epilepsy, Institute of Neurology, University College London, UK.
| | | | | | | |
Collapse
|
43
|
Strange BA, Duggins A, Penny W, Dolan RJ, Friston KJ. Information theory, novelty and hippocampal responses: unpredicted or unpredictable? Neural Netw 2005; 18:225-30. [PMID: 15896570 DOI: 10.1016/j.neunet.2004.12.004] [Citation(s) in RCA: 192] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2004] [Accepted: 12/17/2004] [Indexed: 11/24/2022]
Abstract
Shannon's information theory provides a principled framework for the quantitative analysis of brain responses during the encoding and representation of event streams. In particular, entropy measures the expected uncertainty of events in a given context. This contextual uncertainty or unpredictability may, itself, be important for balancing [bottom-up] sensory information and [top-down] prior expectations during perceptual synthesis. Using event-related functional magnetic resonance imaging (fMRI), we found that the anterior hippocampus is sensitive to the entropy of a visual stimulus stream. In contrast, activity in an extensive bilateral cortico-thalamic network was dictated by the surprise or information associated with each particular stimulus. In short, we show that the probabilistic structure or context in which events occur is an important predictor of hippocampal activity.
Collapse
Affiliation(s)
- Bryan A Strange
- Wellcome Department of Imaging Neuroscience, Functional Imaging Laboratory, Institute of Neurology, 12 Queen Square, London WC1N 3BG, UK.
| | | | | | | | | |
Collapse
|
44
|
Strange BA, Hurlemann R, Duggins A, Heinze HJ, Dolan RJ. Dissociating intentional learning from relative novelty responses in the medial temporal lobe. Neuroimage 2005; 25:51-62. [PMID: 15734343 DOI: 10.1016/j.neuroimage.2004.12.014] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2004] [Revised: 11/11/2004] [Accepted: 12/08/2004] [Indexed: 11/20/2022] Open
Abstract
The establishment of a role for medial temporal lobe (MTL) structures in episodic memory has led to an investigative focus on the specific contributions and interactions between constituent MTL regions, including the hippocampus and surrounding medial temporal cortices. By dissociating an intentional stimulus-category learning condition from a passive viewing condition, we demonstrate, using fMRI, that novelty- and familiarity-driven responses in human anterior and posterior hippocampus, respectively, only occur during intentional learning. With increasing familiarity of stimulus-category associations, there is a shift in neuronal responses from anterior to posterior hippocampal regions. This anterior/posterior response gradient may reflect a weighting of functional hippocampal architecture related to encoding of novel and retrieval of familiar information. By contrast, perirhinal cortex is engaged by novel stimuli irrespective of task, highlighting this region as a component of a generic familiarity discrimination system. By introducing distinct stimulus types, we further demonstrate that these MTL responses are independent of stimulus complexity. Different patterns of activity for intentional learning vs. passive viewing indicate that intentional encoding/retrieval of stimulus-category associations and automatic novelty/familiarity assessment of stimuli are processed in anatomically dissociable neuronal ensembles within the MTL memory system.
Collapse
Affiliation(s)
- Bryan A Strange
- Wellcome Department of Imaging Neuroscience, Functional Imaging Laboratory, Institute of Neurology, 12 Queen Square, London, WC1N 3BG, UK.
| | | | | | | | | |
Collapse
|
45
|
Richardson MP, Strange BA, Thompson PJ, Baxendale SA, Duncan JS, Dolan RJ. Pre-operative verbal memory fMRI predicts post-operative memory decline after left temporal lobe resection. ACTA ACUST UNITED AC 2004; 127:2419-26. [PMID: 15459025 DOI: 10.1093/brain/awh293] [Citation(s) in RCA: 127] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Functional MRI (fMRI) of cognitive tasks depends on technology widely available in the clinical sphere, but has yet to show a role in the investigation of patients. We report here the first demonstration of a clinically valuable role for cognitive fMRI. Temporal lobe epilepsy (TLE) is commonly caused by hippocampal sclerosis and is frequently resistant to drug treatment. Surgical resection of the left hippocampus in this setting can cure seizures, but may produce significant verbal memory decline, which is hard to predict. We report 10 right-handed TLE patients with left hippocampal sclerosis who underwent left hippocampal resection. We compared currently used data for the prediction of post-operative verbal memory decline in such patients with a novel fMRI assessment of verbal memory encoding. Multiple regression analyses showed that fMRI provided the strongest independent predictor of memory outcome after surgery. At the individual subject level, the fMRI data had high positive predictive value for memory decline.
Collapse
Affiliation(s)
- Mark P Richardson
- Department of Clinical and Experimental Epilepsy , Institute of Neurology, University College London, UK.
| | | | | | | | | | | |
Collapse
|
46
|
Strange BA, Dolan RJ. Beta-adrenergic modulation of emotional memory-evoked human amygdala and hippocampal responses. Proc Natl Acad Sci U S A 2004; 101:11454-8. [PMID: 15269349 PMCID: PMC509222 DOI: 10.1073/pnas.0404282101] [Citation(s) in RCA: 226] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2004] [Indexed: 11/18/2022] Open
Abstract
Human emotional experience is typically associated with enhanced episodic memory. We have used functional magnetic resonance imaging to demonstrate that successful encoding of emotional, compared to neutral, verbal stimuli evokes increased human amygdala responses. Items that evoke amygdala activation at encoding evoke greater hippocampal responses at retrieval compared to neutral items. Administration of the beta-adrenergic antagonist propranolol at encoding abolishes the enhanced amygdala encoding and hippocampal retrieval effects, despite propranolol being no longer present at retrieval. Thus, memory-related amygdala responses at encoding and hippocampal responses at recognition for emotional items depend on beta-adrenergic engagement at encoding. Our results suggest that human emotional memory is associated with a beta-adrenergic-dependent modulation of amygdala-hippocampal interactions.
Collapse
Affiliation(s)
- B A Strange
- Wellcome Department of Imaging Neuroscience, Institute of Neurology, University College London, 12 Queen Square, London WC1N 3BG, United Kingdom.
| | | |
Collapse
|
47
|
Richardson MP, Strange BA, Dolan RJ. Encoding of emotional memories depends on amygdala and hippocampus and their interactions. Nat Neurosci 2004; 7:278-85. [PMID: 14758364 DOI: 10.1038/nn1190] [Citation(s) in RCA: 330] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2003] [Accepted: 12/08/2003] [Indexed: 11/08/2022]
Abstract
We have studied patients with variable degrees of left hippocampal and amygdala pathology who performed a verbal encoding task during functional magnetic resonance imaging (fMRI) to assess the impact of pathology on emotional-memory performance and encoding-evoked activity. The severity of left hippocampal pathology predicted memory performance for neutral and emotional items alike, whereas the severity of amygdala pathology predicted memory performance for emotional items alone. Encoding-related hippocampal activity for successfully remembered emotional items correlated with the degree of left amygdala pathology. Conversely, amygdala-evoked activity with respect to subsequently remembered emotional items correlated with the degree of left hippocampal pathology. Our data indicate a reciprocal dependence between amygdala and hippocampus during the encoding of emotional memories.
Collapse
Affiliation(s)
- Mark P Richardson
- Department of Clinical and Experimental Epilepsy, Institute of Neurology, Queen Square London WC1N 3BG, UK.
| | | | | |
Collapse
|
48
|
Richardson MP, Strange BA, Duncan JS, Dolan RJ. Preserved verbal memory function in left medial temporal pathology involves reorganisation of function to right medial temporal lobe. Neuroimage 2004; 20 Suppl 1:S112-9. [PMID: 14597304 DOI: 10.1016/j.neuroimage.2003.09.008] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The left hippocampus and related structures mediate verbal memory function. The mechanism underlying preserved verbal memory function in patients with left hippocampal damage is unknown. Temporal lobe epilepsy, a common disease, is frequently the consequence of a characteristic hippocampal pathology termed hippocampal sclerosis, which may also affect the amygdala. In this setting, mapping the sites of memory function is a vital component of planning for surgical treatment for epilepsy. Using event-related functional magnetic resonance imaging, we studied 24 right-handed nonamnesic patients with left hippocampal sclerosis and 12 normal controls, performing a verbal encoding task. The patients were subdivided into two groups according to presence or absence of additional left amygdala pathology. Analysis of the data employed a two-level random-effects design, examining the main effects of subsequent memory in each group, as well as the differences between the groups. Additional effects of emotionality of the remembered words were also examined. Verbal memory encoding involved activation of left hippocampus in normals, but was associated with reorganisation to right hippocampus and parahippocampal gyrus in the patients. The additional presence of left amygdala sclerosis resulted in reorganisation for encoding of emotional verbal material to right amygdala. Retained verbal memory function in the presence of left medial temporal lobe pathology is mediated by recruitment of a parallel system in the right hemisphere consistent with adaptive functional reorganisation. The findings indicate a high degree of plasticity in medial temporal lobe structures.
Collapse
Affiliation(s)
- Mark P Richardson
- Department of Clinical and Experimental Epilepsy, Institute of Neurology, Queen Square, London, WC1N 3BG, UK.
| | | | | | | |
Collapse
|
49
|
Strange BA, Hurlemann R, Dolan RJ. An emotion-induced retrograde amnesia in humans is amygdala- and beta-adrenergic-dependent. Proc Natl Acad Sci U S A 2003; 100:13626-31. [PMID: 14595032 PMCID: PMC263864 DOI: 10.1073/pnas.1635116100] [Citation(s) in RCA: 169] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2003] [Indexed: 11/18/2022] Open
Abstract
The influence of emotion on human memory is associated with two contradictory effects in the form of either emotion-induced enhancements or decrements in memory. In a series of experiments involving single word presentation, we show that enhanced memory for emotional words is strongly coupled to decrements in memory for items preceding the emotional stimulus, an effect that is more pronounced in women. These memory effects would appear to depend on a common neurobiological substrate, in that enhancements and decrements are reversed by propranolol, a beta-adrenergic antagonist, and abolished by selective bilateral amygdala damage. Thus, our findings suggest that amygdala-dependent beta-adrenergic modulation of episodic encoding has costs as well as benefits.
Collapse
Affiliation(s)
- B A Strange
- Wellcome Department of Imaging Neuroscience, Institute of Neurology, 12 Queen Square, London WC1N 3BG, United Kingdom.
| | | | | |
Collapse
|
50
|
Abstract
An efficient memory system requires the ability to detect and preferentially encode novel stimuli. Human electrophysiological recordings demonstrate differential hippocampal responses to novel vs. familiar stimuli, as well as to oddball stimuli. Although functional imaging experiments of novelty detection have demonstrated hippocampal activation, oddball-evoked hippocampal activation has not been demonstrated. Here we use event-related functional magnetic resonance imaging (fMRI) to measure hippocampal responses to three types of oddball words: perceptual, semantic, and emotional. We demonstrate left anterior hippocampal sensitivity to all three oddball types, with adaptation of responses across multiple oddball presentations. This adaptive hippocampal oddball response was not modulated by depth of processing, suggesting a high degree of automaticity in the underlying process. However, an interaction with depth of encoding for semantic oddballs was evident in a more lateral left anterior hippocampal region. We conclude that the hippocampal response to oddballs demonstrates a second-order novelty effect, being sensitive to the "novelty of novelty" of oddball stimuli. The data provide support for a more general theory that a function of the anterior hippocampus is to register mismatches between expectation and experience.
Collapse
Affiliation(s)
- B A Strange
- Wellcome Department of Cognitive Neurology, Institute of Neurology, London, UK.
| | | |
Collapse
|