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Coolen T, Mihai Dumitrescu A, Wens V, Bourguignon M, Rovai A, Sadeghi N, Urbain C, Goldman S, De Tiège X. Spectrotemporal cortical dynamics and semantic control during sentence completion. Clin Neurophysiol 2024; 163:90-101. [PMID: 38714152 DOI: 10.1016/j.clinph.2024.04.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 03/27/2024] [Accepted: 04/14/2024] [Indexed: 05/09/2024]
Abstract
OBJECTIVE To investigate cortical oscillations during a sentence completion task (SC) using magnetoencephalography (MEG), focusing on the semantic control network (SCN), its leftward asymmetry, and the effects of semantic control load. METHODS Twenty right-handed adults underwent MEG while performing SC, consisting of low cloze (LC: multiple responses) and high cloze (HC: single response) stimuli. Spectrotemporal power modulations as event-related synchronizations (ERS) and desynchronizations (ERD) were analyzed: first, at the whole-brain level; second, in key SCN regions, posterior middle/inferior temporal gyri (pMTG/ITG) and inferior frontal gyri (IFG), under different semantic control loads. RESULTS Three cortical response patterns emerged: early (0-200 ms) theta-band occipital ERS; intermediate (200-700 ms) semantic network alpha/beta-band ERD; late (700-3000 ms) dorsal language stream alpha/beta/gamma-band ERD. Under high semantic control load (LC), pMTG/ITG showed prolonged left-sided engagement (ERD) and right-sided inhibition (ERS). Left IFG exhibited heightened late (2500-2550 ms) beta-band ERD with increased semantic control load (LC vs. HC). CONCLUSIONS SC involves distinct cortical responses and depends on the left IFG and asymmetric engagement of the pMTG/ITG for semantic control. SIGNIFICANCE Future use of SC in neuromagnetic preoperative language mapping and for understanding the pathophysiology of language disorders in neurological conditions.
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Affiliation(s)
- Tim Coolen
- Université Libre de Bruxelles (ULB), ULB Neuroscience Institute (UNI), Laboratoire de Neuroanatomie et Neuroimagerie Translationnelles (LN(2)T), Brussels, Belgium; Université Libre de Bruxelles, Hôpital Universitaire de Bruxelles (HUB), CUB Hôpital Erasme, Department of Radiology, Brussels, Belgium.
| | - Alexandru Mihai Dumitrescu
- Université Libre de Bruxelles (ULB), ULB Neuroscience Institute (UNI), Laboratoire de Neuroanatomie et Neuroimagerie Translationnelles (LN(2)T), Brussels, Belgium
| | - Vincent Wens
- Université Libre de Bruxelles (ULB), ULB Neuroscience Institute (UNI), Laboratoire de Neuroanatomie et Neuroimagerie Translationnelles (LN(2)T), Brussels, Belgium
| | - Mathieu Bourguignon
- Université Libre de Bruxelles (ULB), ULB Neuroscience Institute (UNI), Laboratoire de Neuroanatomie et Neuroimagerie Translationnelles (LN(2)T), Brussels, Belgium; Université Libre de Bruxelles (ULB), ULB Neuroscience Institute (UNI), Laboratory of Neurophysiology and Movement Biomechanics, Brussels, Belgium
| | - Antonin Rovai
- Université Libre de Bruxelles (ULB), ULB Neuroscience Institute (UNI), Laboratoire de Neuroanatomie et Neuroimagerie Translationnelles (LN(2)T), Brussels, Belgium
| | - Niloufar Sadeghi
- Université Libre de Bruxelles, Hôpital Universitaire de Bruxelles (HUB), CUB Hôpital Erasme, Department of Radiology, Brussels, Belgium
| | - Charline Urbain
- Université Libre de Bruxelles (ULB), ULB Neuroscience Institute (UNI), Laboratoire de Neuroanatomie et Neuroimagerie Translationnelles (LN(2)T), Brussels, Belgium; Université Libre de Bruxelles (ULB), ULB Neuroscience Institute (UNI), Centre for Research in Cognition and Neurosciences (CRCN), Neuropsychology and Functional Neuroimaging Research Unit (UR2NF), Brussels, Belgium
| | - Serge Goldman
- Université Libre de Bruxelles (ULB), ULB Neuroscience Institute (UNI), Laboratoire de Neuroanatomie et Neuroimagerie Translationnelles (LN(2)T), Brussels, Belgium
| | - Xavier De Tiège
- Université Libre de Bruxelles (ULB), ULB Neuroscience Institute (UNI), Laboratoire de Neuroanatomie et Neuroimagerie Translationnelles (LN(2)T), Brussels, Belgium
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Audrain S, Barnett A, Mouseli P, McAndrews MP. Leveraging the resting brain to predict memory decline after temporal lobectomy. Epilepsia 2023; 64:3061-3072. [PMID: 37643922 DOI: 10.1111/epi.17767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 08/28/2023] [Accepted: 08/28/2023] [Indexed: 08/31/2023]
Abstract
OBJECTIVE Predicting memory morbidity after temporal lobectomy in patients with temporal lobe epilepsy (TLE) relies on indices of preoperative temporal lobe structural and functional integrity. However, epilepsy is increasingly considered a network disorder, and memory a network phenomenon. We assessed the utility of functional network measures to predict postoperative memory changes. METHODS Seventy-two adults with TLE (37 left/35 right) underwent preoperative resting-state functional magnetic resonance imaging and pre- and postoperative neuropsychological assessment. We compared functional connectivity throughout the memory network of each patient to a healthy control template (n = 19) to identify differences in global organization. A second metric indicated the degree of integration of the to-be-resected temporal lobe with the rest of the memory network. We included these measures in a linear regression model alongside standard clinical variables as predictors of memory change after surgery. RESULTS Left TLE patients with more atypical memory networks, and with greater functional integration of the to-be-resected region with the rest of the memory network preoperatively, experienced the greatest decline in verbal memory after surgery. Together, these two measures explained 44% of variance in verbal memory change, outperforming standard clinical and demographic variables. None of the variables examined was associated with visuospatial memory change in patients with right TLE. SIGNIFICANCE Resting-state connectivity provides valuable information concerning both the integrity of to-be-resected tissue and functional reserve across memory-relevant regions outside of the to-be-resected tissue. Intrinsic functional connectivity has the potential to be useful for clinical decision-making regarding memory outcomes in left TLE, and more work is needed to identify the factors responsible for differences seen in right TLE.
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Affiliation(s)
- Sam Audrain
- Division of Clinical and Computational Neuroscience, Krembil Research Institute, University Health Network, Toronto, Ontario, Canada
| | - Alexander Barnett
- Department of Psychology, University of Toronto, Toronto, Ontario, Canada
| | - Pedram Mouseli
- Division of Clinical and Computational Neuroscience, Krembil Research Institute, University Health Network, Toronto, Ontario, Canada
- Centre for Multimodal Sensorimotor and Pain Research, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada
| | - Mary Pat McAndrews
- Division of Clinical and Computational Neuroscience, Krembil Research Institute, University Health Network, Toronto, Ontario, Canada
- Department of Psychology, University of Toronto, Toronto, Ontario, Canada
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Thomas G, McMahon KL, Finch E, Copland DA. Interindividual variability and consistency of language mapping paradigms for presurgical use. BRAIN AND LANGUAGE 2023; 243:105299. [PMID: 37413742 DOI: 10.1016/j.bandl.2023.105299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 04/08/2023] [Accepted: 06/21/2023] [Indexed: 07/08/2023]
Abstract
Most functional MRI studies of language processing have focussed on group-level inference, but for clinical use, the aim is to predict outcomes at an individual patient level. This requires being able to identify atypical activation and understand how differences relate to language outcomes. A language mapping paradigm that selectively activates left hemisphere language regions in healthy individuals allows atypical activation in a patient to be more easily identified. We investigated the interindividual variability and consistency of language activation in 12 healthy participants using three tasks-verb generation, responsive naming, and sentence comprehension-for future presurgical use. Responsive naming produced the most consistent left-lateralised activation across participants in frontal and temporal regions that postsurgical voxel-based lesion-symptom mapping studies suggest are most critical for language outcomes. Studies with a long-term clinical aim of predicting language outcomes in neurosurgical patients and stroke patients should first establish paradigm validity at an individual level in healthy participants.
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Affiliation(s)
- Georgia Thomas
- School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Australia; Queensland Aphasia Research Centre, School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Australia.
| | - Katie L McMahon
- School of Clinical Sciences, Centre for Biomedical Technologies, Queensland University of Technology, Brisbane, Australia; Herston Imaging Research Facility, The University of Queensland, Brisbane, Australia
| | - Emma Finch
- School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Australia; Research and Innovation, West Moreton Health, Ipswich, Australia; Speech Pathology Department, Princess Alexandra Hospital, Brisbane, Australia
| | - David A Copland
- School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Australia; Queensland Aphasia Research Centre, School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, Australia; Surgical Treatment and Rehabilitation Service (STARS) Education and Research Alliance, The University of Queensland and Metro North Health, Queensland, Australia
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Binding LP, Dasgupta D, Giampiccolo D, Duncan JS, Vos SB. Structure and function of language networks in temporal lobe epilepsy. Epilepsia 2022; 63:1025-1040. [PMID: 35184291 PMCID: PMC9773900 DOI: 10.1111/epi.17204] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 02/09/2022] [Accepted: 02/16/2022] [Indexed: 12/30/2022]
Abstract
Individuals with temporal lobe epilepsy (TLE) may have significant language deficits. Language capabilities may further decline following temporal lobe resections. The language network, comprising dispersed gray matter regions interconnected with white matter fibers, may be atypical in individuals with TLE. This review explores the structural changes to the language network and the functional reorganization of language abilities in TLE. We discuss the importance of detailed reporting of patient's characteristics, such as, left- and right-sided focal epilepsies as well as lesional and nonlesional pathological subtypes. These factors can affect the healthy functioning of gray and/or white matter. Dysfunction of white matter and displacement of gray matter function could concurrently impact their ability, in turn, producing an interactive effect on typical language organization and function. Surgical intervention can result in impairment of function if the resection includes parts of this structure-function network that are critical to language. In addition, impairment may occur if language function has been reorganized and is included in a resection. Conversely, resection of an epileptogenic zone may be associated with recovery of cortical function and thus improvement in language function. We explore the abnormality of functional regions in a clinically applicable framework and highlight the differences in the underlying language network. Avoidance of language decline following surgical intervention may depend on tailored resections to avoid critical areas of gray matter and their white matter connections. Further work is required to elucidate the plasticity of the language network in TLE and to identify sub-types of language representation, both of which will be useful in planning surgery to spare language function.
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Affiliation(s)
- Lawrence P. Binding
- Department of Computer ScienceCentre for Medical Image ComputingUniversity College LondonLondonUK
- Department of Clinical and Experimental EpilepsyUCL Queen Square Institute of NeurologyUniversity College LondonLondonUK
| | - Debayan Dasgupta
- Department of Clinical and Experimental EpilepsyUCL Queen Square Institute of NeurologyUniversity College LondonLondonUK
- Victor Horsley Department of NeurosurgeryNational Hospital for Neurology and NeurosurgeryLondonUK
| | - Davide Giampiccolo
- Department of Clinical and Experimental EpilepsyUCL Queen Square Institute of NeurologyUniversity College LondonLondonUK
- Victor Horsley Department of NeurosurgeryNational Hospital for Neurology and NeurosurgeryLondonUK
- Institute of NeuroscienceCleveland Clinic LondonLondonUK
- Department of NeurosurgeryVerona University HospitalUniversity of VeronaVeronaItaly
| | - John S. Duncan
- Department of Clinical and Experimental EpilepsyUCL Queen Square Institute of NeurologyUniversity College LondonLondonUK
| | - Sjoerd B. Vos
- Department of Computer ScienceCentre for Medical Image ComputingUniversity College LondonLondonUK
- Neuroradiological Academic UnitUCL Queen Square Institute of NeurologyUniversity College LondonLondonUK
- Centre for Microscopy, Characterisation, and AnalysisThe University of Western AustraliaNedlandsWestern AustraliaAustralia
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Elin K, Malyutina S, Bronov O, Stupina E, Marinets A, Zhuravleva A, Dragoy O. A New Functional Magnetic Resonance Imaging Localizer for Preoperative Language Mapping Using a Sentence Completion Task: Validity, Choice of Baseline Condition, and Test–Retest Reliability. Front Hum Neurosci 2022; 16:791577. [PMID: 35431846 PMCID: PMC9006995 DOI: 10.3389/fnhum.2022.791577] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2021] [Accepted: 03/04/2022] [Indexed: 11/24/2022] Open
Abstract
To avoid post-neurosurgical language deficits, intraoperative mapping of the language function in the brain can be complemented with preoperative mapping with functional magnetic resonance imaging (fMRI). The validity of an fMRI “language localizer” paradigm crucially depends on the choice of an optimal language task and baseline condition. This study presents a new fMRI “language localizer” in Russian using overt sentence completion, a task that comprehensively engages the language function by involving both production and comprehension at the word and sentence level. The paradigm was validated in 18 neurologically healthy volunteers who participated in two scanning sessions, for estimating test–retest reliability. For the first time, two baseline conditions for the sentence completion task were compared. At the group level, the paradigm significantly activated both anterior and posterior language-related regions. Individual-level analysis showed that activation was elicited most consistently in the inferior frontal regions, followed by posterior temporal regions and the angular gyrus. Test–retest reliability of activation location, as measured by Dice coefficients, was moderate and thus comparable to previous studies. Test–retest reliability was higher in the frontal than temporo-parietal region and with the most liberal statistical thresholding compared to two more conservative thresholding methods. Lateralization indices were expectedly left-hemispheric, with greater lateralization in the frontal than temporo-parietal region, and showed moderate test-retest reliability. Finally, the pseudoword baseline elicited more extensive and more reliable activation, although the syllable baseline appears more feasible for future clinical use. Overall, the study demonstrated the validity and reliability of the sentence completion task for mapping the language function in the brain. The paradigm needs further validation in a clinical sample of neurosurgical patients. Additionally, the study contributes to general evidence on test–retest reliability of fMRI.
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Affiliation(s)
- Kirill Elin
- Center for Language and Brain, HSE University, Moscow, Russia
| | - Svetlana Malyutina
- Center for Language and Brain, HSE University, Moscow, Russia
- *Correspondence: Svetlana Malyutina,
| | - Oleg Bronov
- Department of Radiology, National Medical and Surgical Center Named After N.I. Pirogov, Moscow, Russia
| | | | - Aleksei Marinets
- Department of Radiology, National Medical and Surgical Center Named After N.I. Pirogov, Moscow, Russia
| | - Anna Zhuravleva
- Center for Language and Brain, HSE University, Moscow, Russia
| | - Olga Dragoy
- Center for Language and Brain, HSE University, Moscow, Russia
- Institute of Linguistics, Russian Academy of Sciences, Moscow, Russia
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Feasibility, Contrast Sensitivity and Network Specificity of Language fMRI in Presurgical Evaluation for Epilepsy and Brain Tumor Surgery. Brain Topogr 2021; 34:511-524. [PMID: 33837867 DOI: 10.1007/s10548-021-00839-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Accepted: 03/30/2021] [Indexed: 02/05/2023]
Abstract
Language fMRI has become an integral part of the planning process in brain surgery. However, fMRI may suffer from confounding factors both on the patient side, as well as on the provider side. In this study, we investigate how patient-related confounds affect the ability of the patient to perform language fMRI tasks (feasibility), the task sensitivity from an image contrast point of view, and the anatomical specificity of expressive and receptive language fMRI protocols. 104 patients were referred for language fMRI in the context of presurgical procedures for epilepsy and brain tumor surgery. Four tasks were used: (1) a verbal fluency (VF) task to map vocabulary use, (2) a semantic description (SD) task to map sentence formation/semantic integration skills, (3) a reading comprehension (RC) task and (4) a listening comprehension (LC) task. Feasibility was excellent in the LC task (100%), but in the acceptable to mediocre range for the rest of the tasks (SD: 87.50%, RC: 85.57%, VF: 67.30%). Feasibility was significantly confounded by age (p = 0.020) and education level (p = 0.003) in VF, by education level (p = 0.004) and lesion laterality (p = 0.019) in SD and by age (p = 0.001), lesion laterality (p = 0.007) and lesion severity (p = 0.048) in RC. All tasks were comparable regarding sensitivity in generating statistically significant image contrast (VF: 90.00%, SD: 92.30%, RC: 93.25%, LC: 88.46%). The lobe of the lesion (p = 0.005) and the age (p = 0.009) confounded contrast sensitivity in the VF and SD tasks respectively. Both VF and LC tasks demonstrated unilateral lateralization of posterior language areas; only the LC task showed unilateral lateralization of anterior language areas. Our study highlights the effects of patient-related confounding factors on language fMRI and proposes LC as the most feasible, less confounded, and efficiently lateralizing task in the clinical presurgical context.
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Omisade A, O'Grady C, Sadler RM, Ikeda K. Functional MRI for language lateralization in individuals with intellectual and cognitive dysfunction: Two clinical case examples. Clin Neuropsychol 2020; 35:1471-1484. [PMID: 32167409 DOI: 10.1080/13854046.2020.1736163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
OBJECTIVE Task-based functional MRI (fMRI) is a common non-invasive method of confirming hemispheric language dominance prior to neurosurgery in epilepsy. However, the use of this method is not recommended for individuals with cognitive dysfunction and in those with IQ below 70 due to concerns about accuracy of task performance in the scanner. This manuscript describes successful use of task-based functional MRI to lateralize language dominance in two individuals with cognitive dysfunction and intellectual disability. METHODS Two patients completed a pre-surgical epilepsy work-up at the QEII Health Sciences Centre in Halifax, Nova Scotia, which included comprehensive neuropsychological assessment. They also completed an fMRI paradigm that involved semantic category fluency, sentence completion, naming to description and passage listening tasks with stimuli delivered both visually and auditorily. RESULTS In both cases, fMRI maps were successful in lateralizing language dominance in relation to other clinical data, including intraoperative cortical mapping in one of the cases. CONCLUSIONS This manuscript is the first to demonstrate that task-based fMRI can be used successfully to lateralize language in adult patients with cognitive and intellectual disabilities, and is the first to propose a specific paradigm for this purpose.
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Affiliation(s)
- A Omisade
- Acquired Brain Injury (Epilepsy Program), Nova Scotia Health Authority, Halifax, Canada.,Department of Psychology & Neuroscience, Dalhousie University, Halifax, Canada
| | - C O'Grady
- Department of Medicine, Nova Scotia Health Authority, Halifax, Canada
| | - R M Sadler
- Department of Medicine, Division of Neurology, Dalhousie University, Halifax, Canada
| | - K Ikeda
- Department of Medicine, Division of Neurology, Dalhousie University, Halifax, Canada
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Utilization of functional MRI language paradigms for pre-operative mapping: a systematic review. Neuroradiology 2019; 62:353-367. [DOI: 10.1007/s00234-019-02322-w] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 11/08/2019] [Indexed: 12/18/2022]
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Zhang M, Savill N, Margulies DS, Smallwood J, Jefferies E. Distinct individual differences in default mode network connectivity relate to off-task thought and text memory during reading. Sci Rep 2019; 9:16220. [PMID: 31700143 PMCID: PMC6838089 DOI: 10.1038/s41598-019-52674-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Accepted: 10/21/2019] [Indexed: 01/08/2023] Open
Abstract
Often, as we read, we find ourselves thinking about something other than the text; this tendency to mind-wander is linked to poor comprehension and reduced subsequent memory for texts. Contemporary accounts argue that periods of off-task thought are related to the tendency for attention to be decoupled from external input. We used fMRI to understand the neural processes that underpin this phenomenon. First, we found that individuals with poorer text-based memory tend to show reduced recruitment of left middle temporal gyrus in response to orthographic input, within a region located at the intersection of default mode, dorsal attention and frontoparietal networks. Voxels within these networks were taken as seeds in a subsequent resting-state study. The default mode network region (i) had greater connectivity with medial prefrontal cortex, falling within the same network, for individuals with better text-based memory, and (ii) was more decoupled from medial visual regions in participants who mind-wandered more frequently. These findings suggest that stronger intrinsic connectivity within the default mode network is linked to better text processing, while reductions in default mode network coupling to the visual system may underpin individual variation in the tendency for our attention to become disengaged from what we are reading.
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Affiliation(s)
- Meichao Zhang
- Department of Psychology, University of York, Heslington, York, YO10 5DD, UK.
| | - Nicola Savill
- School of Psychological and Social Sciences, York St John University, York, YO31 7EX, UK
| | - Daniel S Margulies
- Frontlab, Centre National de la Recherche Scientifique (CNRS) UMR 7225, Institut du cerveau et de la moelle épinière (ICM), 75013, Paris, France
| | - Jonathan Smallwood
- Department of Psychology, University of York, Heslington, York, YO10 5DD, UK
| | - Elizabeth Jefferies
- Department of Psychology, University of York, Heslington, York, YO10 5DD, UK
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Unadkat P, Fumagalli L, Rigolo L, Vangel MG, Young GS, Huang R, Mukundan S, Golby A, Tie Y. Functional MRI Task Comparison for Language Mapping in Neurosurgical Patients. J Neuroimaging 2019; 29:348-356. [PMID: 30648771 PMCID: PMC6506353 DOI: 10.1111/jon.12597] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2018] [Revised: 12/07/2018] [Accepted: 12/10/2018] [Indexed: 11/27/2022] Open
Abstract
BACKGROUND AND PURPOSE Language task-based functional MRI (fMRI) is increasingly used for presurgical planning in patients with brain lesions. Different paradigms elicit activations of different components of the language network. The aim of this study is to optimize fMRI clinical usage by comparing the effectiveness of three language tasks for language lateralization and localization in a large group of patients with brain lesions. METHODS We analyzed fMRI data from a sequential retrospective cohort of 51 patients with brain lesions who underwent presurgical fMRI language mapping. We compared the effectiveness of three language tasks (Antonym Generation, Sentence Completion (SC), and Auditory Naming) for lateralizing language function and for activating cortex within patient-specific regions-of-interest representing eloquent language areas, and assessed the degree of spatial overlap of the areas of activation elicited by each task. RESULTS The tasks were similarly effective for lateralizing language within the anterior language areas. The SC task produced higher laterality indices within the posterior language areas and had a significantly higher agreement with the clinical report. Dice coefficients between the task pairs were in the range of .351-.458, confirming substantial variation in the components of the language network activated by each task. CONCLUSIONS SC task consistently produced large activations within the dominant hemisphere and was more effective for lateralizing language within the posterior language areas. The low degree of spatial overlap among the tasks strongly supports the practice of using a battery of tasks to help the surgeon to avoid eloquent language areas.
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Affiliation(s)
| | | | - Laura Rigolo
- From the Department of Neurosurgery, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (PU, LF, LR, AG, YT); Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (PU, MGV, GSY, RH, SM, AG); School of Medicine and Surgery, Universitá degli Studi di Milano-Bicocca, Milan, Italy (LF); and Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA (MGV)
| | - Mark G. Vangel
- From the Department of Neurosurgery, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (PU, LF, LR, AG, YT); Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (PU, MGV, GSY, RH, SM, AG); School of Medicine and Surgery, Universitá degli Studi di Milano-Bicocca, Milan, Italy (LF); and Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA (MGV)
| | - Geoffrey S. Young
- From the Department of Neurosurgery, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (PU, LF, LR, AG, YT); Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (PU, MGV, GSY, RH, SM, AG); School of Medicine and Surgery, Universitá degli Studi di Milano-Bicocca, Milan, Italy (LF); and Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA (MGV)
| | - Raymond Huang
- From the Department of Neurosurgery, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (PU, LF, LR, AG, YT); Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (PU, MGV, GSY, RH, SM, AG); School of Medicine and Surgery, Universitá degli Studi di Milano-Bicocca, Milan, Italy (LF); and Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA (MGV)
| | - Srinivasan Mukundan
- From the Department of Neurosurgery, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (PU, LF, LR, AG, YT); Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (PU, MGV, GSY, RH, SM, AG); School of Medicine and Surgery, Universitá degli Studi di Milano-Bicocca, Milan, Italy (LF); and Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA (MGV)
| | - Alexandra Golby
- From the Department of Neurosurgery, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (PU, LF, LR, AG, YT); Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (PU, MGV, GSY, RH, SM, AG); School of Medicine and Surgery, Universitá degli Studi di Milano-Bicocca, Milan, Italy (LF); and Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA (MGV)
| | - Yanmei Tie
- From the Department of Neurosurgery, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (PU, LF, LR, AG, YT); Department of Radiology, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA (PU, MGV, GSY, RH, SM, AG); School of Medicine and Surgery, Universitá degli Studi di Milano-Bicocca, Milan, Italy (LF); and Department of Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA (MGV)
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Visual and Auditory fMRI Paradigms for Presurgical Language Mapping: Convergent Validity and Relationship to Individual Variables. Neurol Res Int 2019; 2019:6728120. [PMID: 31057966 PMCID: PMC6463566 DOI: 10.1155/2019/6728120] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Accepted: 02/13/2019] [Indexed: 11/18/2022] Open
Abstract
Functional MRI (fMRI) has emerged as a safe alternative to invasive procedures for determining hemispheric language dominance prior to neurosurgery. Despite this, there are currently no standardized fMRI protocols that have been explored in healthy controls to determine the influence of individual patient variables on the results, which poses challenges in clinical interpretation of ambiguous findings in patient populations. In addition, most fMRI protocols are not suitable for individuals with visual or intellectual disabilities (IQ<70). In the current study, 61 healthy adults (ages: 18-74 years) completed two fMRI paradigms for language mapping. One paradigm used visually based stimuli and has shown good face validity to date in our center. The second paradigm used auditory stimuli presented at slowed speed and was designed for individuals with visual or cognitive dysfunction but has not yet been used clinically. The paradigms demonstrated 97% agreement in classifying individuals as left-hemisphere, right-hemisphere, and bilaterally dominant. Cases that were classified differently showed bilateral dominance in response to either paradigm. Dominance classification rates for right- and left-handed individuals were largely in keeping with published data. Within the left-handed group, IQ and education were positively correlated with laterality indices generated by both paradigms (r values range: 0.44-0.95, p<0.01), suggesting that individuals with higher IQ and formal education were more likely to be classified as left-hemisphere dominant in the current sample. This study will help improve clinical interpretation of language fMRI maps by identifying factors that might impact results (like IQ). It also offers an alternative paradigm to make this procedure more accessible to a broader range of patients. Future studies will replicate results with a sample of patients with epilepsy across a broad range of intellectual abilities.
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Audrain S, Barnett AJ, McAndrews MP. Language network measures at rest indicate individual differences in naming decline after anterior temporal lobe resection. Hum Brain Mapp 2018; 39:4404-4419. [PMID: 29956405 DOI: 10.1002/hbm.24281] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2018] [Revised: 06/03/2018] [Accepted: 06/06/2018] [Indexed: 02/03/2023] Open
Abstract
While anterior temporal lobe (ATL) resection is an effective treatment for temporal lobe epilepsy, surgery on the dominant hemisphere is associated with variable decline in confrontation naming. Accurate prediction of naming impairment is critical to inform clinical decision making, and while there has been some degree of success using task-based functional MRI (fMRI) paradigms, there remains a growing interest in the predictive utility of resting-state connectivity as it allows for relatively shorter scans with low task demands. Our objective was to assess the relationship between measures of preoperative resting-state connectivity and postoperative naming change in patients following left ATL resection. We compared the resting language network connectivity of each patient to a normative healthy control template using a novel measure called "matrix similarity," and found that patients with more abnormal global language-network connectivity-particularly of regions spared from surgery-showed greater postoperative naming decline than those with normative patterns of connectivity. When we interrogated the degree centrality of to-be-resected regions in a more targeted approach of the pathological temporal lobe, we found that greater functional integration of those regions with the rest of the language network at rest was related to greater decline in naming following surgery. Finally, we found that matrix similarity was a better predictor of postoperative outcome than degree within to-be-resected regions, network clustering, modularity, and language task fMRI laterality. We provide some of the first evidence that using this novel measure, a relatively short preoperative resting scan can be exploited to inform naming ability following ATL resection.
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Affiliation(s)
- Samantha Audrain
- Brain Imaging and Behavior: Systems Neuroscience, Krembil Research Institute, University Health Network, Toronto, Ontario, Canada.,Department of Psychology, University of Toronto, Toronto, Ontario, Canada
| | - Alexander J Barnett
- Brain Imaging and Behavior: Systems Neuroscience, Krembil Research Institute, University Health Network, Toronto, Ontario, Canada.,Department of Psychology, University of Toronto, Toronto, Ontario, Canada
| | - Mary P McAndrews
- Brain Imaging and Behavior: Systems Neuroscience, Krembil Research Institute, University Health Network, Toronto, Ontario, Canada.,Department of Psychology, University of Toronto, Toronto, Ontario, Canada
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Black DF, Vachha B, Mian A, Faro SH, Maheshwari M, Sair HI, Petrella JR, Pillai JJ, Welker K. American Society of Functional Neuroradiology-Recommended fMRI Paradigm Algorithms for Presurgical Language Assessment. AJNR Am J Neuroradiol 2017; 38:E65-E73. [PMID: 28860215 DOI: 10.3174/ajnr.a5345] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
INTRODUCTION Functional MR imaging is increasingly being used for presurgical language assessment in the treatment of patients with brain tumors, epilepsy, vascular malformations, and other conditions. The inherent complexity of fMRI, which includes numerous processing steps and selective analyses, is compounded by institution-unique approaches to patient training, paradigm choice, and an eclectic array of postprocessing options from various vendors. Consequently, institutions perform fMRI in such markedly different manners that data sharing, comparison, and generalization of results are difficult. The American Society of Functional Neuroradiology proposes widespread adoption of common fMRI language paradigms as the first step in countering this lost opportunity to advance our knowledge and improve patient care. LANGUAGE PARADIGM REVIEW PROCESS A taskforce of American Society of Functional Neuroradiology members from multiple institutions used a broad literature review, member polls, and expert opinion to converge on 2 sets of standard language paradigms that strike a balance between ease of application and clinical usefulness. ASFNR RECOMMENDATIONS The taskforce generated an adult language paradigm algorithm for presurgical language assessment including the following tasks: Sentence Completion, Silent Word Generation, Rhyming, Object Naming, and/or Passive Story Listening. The pediatric algorithm includes the following tasks: Sentence Completion, Rhyming, Antonym Generation, or Passive Story Listening. DISCUSSION Convergence of fMRI language paradigms across institutions offers the first step in providing a "Rosetta Stone" that provides a common reference point with which to compare and contrast the usefulness and reliability of fMRI data. From this common language task battery, future refinements and improvements are anticipated, particularly as objective measures of reliability become available. Some commonality of practice is a necessary first step to develop a foundation on which to improve the clinical utility of this field.
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Affiliation(s)
- D F Black
- From the Mayo Clinic (D.F.B., K.W.), Rochester Minnesota
| | - B Vachha
- Memorial Sloan Kettering Cancer Center (B.V.), New York, New York
| | - A Mian
- Boston University School of Medicine (A.M.), Boston, Massachusetts
| | - S H Faro
- Johns Hopkins University School of Medicine and the Johns Hopkins Hospital (S.H.F., H.I.S., J.J.P.), Baltimore, Maryland
| | - M Maheshwari
- Children's Hospital of Wisconsin (M.M.), Milwaukee, Wisconsin
| | - H I Sair
- Johns Hopkins University School of Medicine and the Johns Hopkins Hospital (S.H.F., H.I.S., J.J.P.), Baltimore, Maryland
| | - J R Petrella
- Duke University School of Medicine, (J.R.P.) Durham, North Carolina
| | - J J Pillai
- Johns Hopkins University School of Medicine and the Johns Hopkins Hospital (S.H.F., H.I.S., J.J.P.), Baltimore, Maryland
| | - K Welker
- From the Mayo Clinic (D.F.B., K.W.), Rochester Minnesota
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Language Representation Following Left MCA Stroke in Children and Adults: An fMRI Study. Can J Neurol Sci 2017; 44:483-497. [PMID: 28468691 DOI: 10.1017/cjn.2017.44] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND In this case series, functional magnetic resonance imaging was used to examine brain networks that mediate different aspects of language function in 4 young adults (17-22 years) with a history of left middle cerebral artery (MCA) stroke in childhood (40 years of age). Although it is widely believed that altered lateralization patterns are more likely to occur following early brain injuries compared with later brain injuries, the presumed plasticity of the young brain has been challenged in recent years, particularly in the domain of language. METHODS We explored this issue by contrasting the brain activation patterns of individuals with childhood left MCA stroke and adult left MCA stroke while performing two language tasks: verb generation and picture-word matching. Importantly, both groups showed significant recovery of language function, based on standard clinical indicators. RESULTS Controls showed left lateralized activation for both tasks, although much more pronounced for verb generation. Adult stroke patients also showed left lateralization for both tasks, though somewhat weaker than controls. Childhood stroke patients exhibited significantly weaker lateralization than the adult group for verb generation, but there was no significant group difference for picture-word matching. CONCLUSIONS These preliminary findings suggest that successful reorganization of language function is more likely to involve bilateral recruitment following left MCA stroke in childhood than in adulthood. Of importance, although childhood stroke patients had primarily subcortical lesions, there were substantial alterations in cortical activation patterns.
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A contemporary framework of language processing in the human brain in the context of preoperative and intraoperative language mapping. Neuroradiology 2016; 59:69-87. [PMID: 28005160 DOI: 10.1007/s00234-016-1772-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2016] [Accepted: 12/05/2016] [Indexed: 02/06/2023]
Abstract
INTRODUCTION The emergence of advanced in vivo neuroimaging methods has redefined the understanding of brain function with a shift from traditional localizationist models to more complex and widely distributed neural networks. In human language processing, the traditional localizationist models of Wernicke and Broca have fallen out of favor for a dual-stream processing system involving complex networks organized over vast areas of the dominant hemisphere. The current review explores the cortical function and white matter connections of human language processing, as well as their relevance to surgical planning. METHODS We performed a systematic review of the literature with narrative data analysis. RESULTS Although there is significant heterogeneity in the literature over the past century of exploration, modern evidence provides new insight into the true cortical function and white matter anatomy of human language. Intraoperative data and postoperative outcome studies confirm a widely distributed language network extending far beyond the traditional cortical areas of Wernicke and Broca. CONCLUSIONS The anatomic distribution of language networks, based on current theories, is explored to present a modern and clinically relevant interpretation of language function. Within this framework, we present current knowledge regarding the known effects of damage to both cortical and subcortical components of these language networks. Ideally, we hope this framework will provide a common language for which to base future clinical studies in human language function.
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Batouli SAH, Hasani N, Gheisari S, Behzad E, Oghabian MA. Evaluation of the factors influencing brain language laterality in presurgical planning. Phys Med 2016; 32:1201-1209. [PMID: 27742256 DOI: 10.1016/j.ejmp.2016.06.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2015] [Revised: 06/07/2016] [Accepted: 06/17/2016] [Indexed: 10/20/2022] Open
Abstract
Brain lesions cause functional deficits, and one treatment for this condition is lesion resection. In most cases, presurgical planning (PSP) and the information from laterality indices are necessary for maximum preservation of the critical functions after surgery. Language laterality index (LI) is reliably estimated using functional magnetic resonance imaging (fMRI); however, this measure is under the influence of some external factors. In this study, we investigated the influence of a number of factors on language LI, using data from 120 patients (mean age=35.65 (±13.4) years) who underwent fMRI for PSP. Using two proposed language tasks from our previous works, brain left hemisphere was showed to be dominant for the language function, although a higher LI was obtained using the "Word Generation" task, compared to the "Reverse Word Reading". In addition, decline of LIs with age, and lower LI when the lesion invaded brain language area were observed. Meanwhile, gender, lesion side (affected hemisphere), LI calculation strategy, and fMRI analysis Z-values did not statistically show any influences on the LIs. Although fMRI is widely used to estimate language LI, it is shown here that in order to present a reliable language LI and to correctly select the dominant hemisphere of the brain, the influence of external factors should be carefully considered.
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Affiliation(s)
- Seyed Amir Hossein Batouli
- Neuroimaging and Analysis Group, Research Center for Cellular and Molecular Imaging, Tehran University of Medical Sciences, Tehran, Iran
| | - Nafiseh Hasani
- Neuroimaging and Analysis Group, Research Center for Cellular and Molecular Imaging, Tehran University of Medical Sciences, Tehran, Iran
| | - Sara Gheisari
- Neuroimaging and Analysis Group, Research Center for Cellular and Molecular Imaging, Tehran University of Medical Sciences, Tehran, Iran
| | - Ebrahim Behzad
- School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Ali Oghabian
- Neuroimaging and Analysis Group, Research Center for Cellular and Molecular Imaging, Tehran University of Medical Sciences, Tehran, Iran.
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O'Grady C, Omisade A, Sadler RM. Language lateralization of a bilingual person with epilepsy using a combination of fMRI and neuropsychological assessment findings. Neurocase 2016; 22:436-442. [PMID: 27653991 DOI: 10.1080/13554794.2016.1233987] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
This report describes the findings of language functional magnetic resonance imaging (fMRI) in a left-handed Urdu and English speaker with right hemisphere-originating epilepsy and unclear language dominance. fMRI is a reliable method for determining hemispheric language dominance in presurgical planning. However, the effects of bilingualism on language activation depend on many factors including age of acquisition and proficiency in the tested language, and morphological properties of the language itself. This case demonstrates that completing fMRI in both spoken languages and interpreting the results within the context of a neuropsychological assessment are essential in arriving at accurate conclusions about language distribution in bilingual patients.
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Affiliation(s)
| | - Antonina Omisade
- b Acquired Brain Injury - Surgical Epilepsy Programme , Nova Scotia Health Authority , Halifax , Canada
| | - R Mark Sadler
- c Division of Neurology , Dalhousie University , Halifax , Canada
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Stippich C, Blatow M, Garcia M. Task-Based Presurgical Functional MRI in Patients with Brain Tumors. CLINICAL FUNCTIONAL MRI 2015. [DOI: 10.1007/978-3-662-45123-6_4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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Contribution of research on 'Epilepsy & behavior' to the refinement of functional brain atlas in four dimensions. Epilepsy Behav 2014; 40:86-8. [PMID: 25262069 PMCID: PMC4254342 DOI: 10.1016/j.yebeh.2014.08.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2014] [Accepted: 08/18/2014] [Indexed: 11/22/2022]
Abstract
Intracranial stimulation mapping by Penfield et al. largely contributed to our current knowledge of the functional organization of motor, sensory, and language systems. The functional maps were generated and printed in two dimensions, based on the summary results of direct cortical stimulation of which locations varied across patients. Intracranial measurement of electrocorticographic changes elicited by a task can localize the regions involved in or participating to the given task. Augmentation of high-gamma activity at >80 Hz is considered to reflect in situ cortical activation at each moment. In the late 2000s, the spatial-temporal profiles of event-related high-gamma activity began to be published as a video material in journals. We have referred to our animation movie as ‘in-vivo animation of event-related high-gamma activity’, that demonstrates ‘when’ and ‘where’ cortical regions are activated in a self-explanatory fashion. Summation of event-related high-gamma measures derived from a large cohort of patients, as previously performed by Penfield et al, is expected to generate unique four-dimensional functional brain atlas covering the whole cerebral cortex.
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Hertz-Pannier L, Noulhiane M, Rodrigo S, Chiron C. Pretherapeutic functional magnetic resonance imaging in children. Neuroimaging Clin N Am 2014; 24:639-53. [PMID: 25441505 DOI: 10.1016/j.nic.2014.07.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
In this article, some specificities of functional magnetic resonance imaging (fMRI) in children (eg, blood-oxygen-level-dependent response and brain maturation, paradigm design, technical issues, feasibility, data analysis) are reviewed, the main knowledge on presurgical cortical mapping in children (motor, language, reading, memory) is summarized, and the emergence of resting state fMRI in presurgical cortical mapping is discussed.
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Affiliation(s)
- Lucie Hertz-Pannier
- UMR 1129, INSERM, Paris Descartes University, CEA-Saclay, Gif sur Yvette, France; UNIACT/Neurospin, I2BM, DSV, CEA-Saclay, Gif sur Yvette, France.
| | - Marion Noulhiane
- UMR 1129, INSERM, Paris Descartes University, CEA-Saclay, Gif sur Yvette, France; UNIACT/Neurospin, I2BM, DSV, CEA-Saclay, Gif sur Yvette, France
| | - Sebastian Rodrigo
- UMR 1129, INSERM, Paris Descartes University, CEA-Saclay, Gif sur Yvette, France; UNIACT/Neurospin, I2BM, DSV, CEA-Saclay, Gif sur Yvette, France
| | - Catherine Chiron
- UMR 1129, INSERM, Paris Descartes University, CEA-Saclay, Gif sur Yvette, France; UNIACT/Neurospin, I2BM, DSV, CEA-Saclay, Gif sur Yvette, France
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