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Berenbaum JG, Nadkarni PA, Marvel CL. An fMRI analysis of verbal and non-verbal working memory in people with a past history of opioid dependence. Front Neurosci 2023; 17:1053500. [PMID: 37090800 PMCID: PMC10113507 DOI: 10.3389/fnins.2023.1053500] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Accepted: 03/20/2023] [Indexed: 04/07/2023] Open
Abstract
Introduction Working memory describes the ability to maintain and manipulate information held in mind, and it is a fundamental aspect of executive function. Within drug addiction, impairments of executive control over behavior are thought to lead to poor decision making and risky behaviors. Previous research has demonstrated working memory (WM) and executive function difficulties in opioid-dependent individuals, but the neural underpinnings of such impairments in this population are not well understood. Methods This study used functional magnetic resonance imaging to examine the neural mechanisms involved in WM in 13 opioid-dependent, methadone-maintained participants (OP) and 13 matched, healthy controls (HC). A Sternberg item-recognition task was administered with three conditions: (1) a "verbal" condition in which participants determined whether any six visually presented target letters matched a probe item that was presented 4-6 s later, (2) a "non-verbal" condition in which participants were presented with a Chinese character and, following a 4-6 s delay, determined whether the character matched the probe item, and (3) a "control" condition in which participants were presented with three horizontal lines and following the same delay, determined whether the lines matched a probe item (always the same three lines). Functional magnetic resonance imaging (fMRI) contrasts focused on the delay (or "maintenance") phase for verbal and non-verbal conditions relative to the control condition. Results Accuracy on the WM task did not differ between groups, but the OP group was significantly slower to respond. The fMRI imaging results indicated differences in brain activity between the OP and HC groups. fMRI-guided regions of interest correlated with age of first alcohol and THC use, suggesting that early substance use, in addition to years of opioid-abuse, may have played a role in the OP group's WM performance. Discussion A deeper understanding of these neural differences between opioid-dependent individuals and their healthy control counterparts helps shed light on fundamental ways in which substance use impacts the brain and cognition, potentially opening up novel avenues for therapeutic targets to treat substance use disorder.
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Affiliation(s)
| | | | - Cherie L. Marvel
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
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Marvel CL, Alm KH, Bhattacharya D, Rebman AW, Bakker A, Morgan OP, Creighton JA, Kozero EA, Venkatesan A, Nadkarni PA, Aucott JN. A multimodal neuroimaging study of brain abnormalities and clinical correlates in post treatment Lyme disease. PLoS One 2022; 17:e0271425. [PMID: 36288329 PMCID: PMC9604010 DOI: 10.1371/journal.pone.0271425] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [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: 06/29/2022] [Accepted: 09/15/2022] [Indexed: 01/24/2023] Open
Abstract
Lyme disease is the most common vector-borne infectious disease in the United States. Post-treatment Lyme disease (PTLD) is a condition affecting 10-20% of patients in which symptoms persist despite antibiotic treatment. Cognitive complaints are common among those with PTLD, suggesting that brain changes are associated with the course of the illness. However, there has been a paucity of evidence to explain the cognitive difficulties expressed by patients with PTLD. This study administered a working memory task to a carefully screened group of 12 patients with well-characterized PTLD and 18 healthy controls while undergoing functional MRI (fMRI). A subset of 12 controls and all 12 PTLD participants also received diffusion tensor imaging (DTI) to measure white matter integrity. Clinical variables were also assessed and correlated with these multimodal MRI findings. On the working memory task, the patients with PTLD responded more slowly, but no less accurately, than did controls. FMRI activations were observed in expected regions by the controls, and to a lesser extent, by the PTLD participants. The PTLD group also hypoactivated several regions relevant to the task. Conversely, novel regions were activated by the PTLD group that were not observed in controls, suggesting a compensatory mechanism. Notably, three activations were located in white matter of the frontal lobe. DTI measures applied to these three regions of interest revealed that higher axial diffusivity correlated with fewer cognitive and neurological symptoms. Whole-brain DTI analyses revealed several frontal lobe regions in which higher axial diffusivity in the patients with PTLD correlated with longer duration of illness. Together, these results show that the brain is altered by PTLD, involving changes to white matter within the frontal lobe. Higher axial diffusivity may reflect white matter repair and healing over time, rather than pathology, and cognition appears to be dynamically affected throughout this repair process.
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Affiliation(s)
- Cherie L. Marvel
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, United States of America
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, United States of America
- * E-mail:
| | - Kylie H. Alm
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, United States of America
| | - Deeya Bhattacharya
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, United States of America
| | - Alison W. Rebman
- Division of Rheumatology, Department of Medicine, Lyme Disease Research Center, Johns Hopkins University School of Medicine, Baltimore, MD, United States of America
| | - Arnold Bakker
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, United States of America
| | - Owen P. Morgan
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, United States of America
| | - Jason A. Creighton
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, United States of America
| | - Erica A. Kozero
- Division of Rheumatology, Department of Medicine, Lyme Disease Research Center, Johns Hopkins University School of Medicine, Baltimore, MD, United States of America
| | - Arun Venkatesan
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, United States of America
| | - Prianca A. Nadkarni
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, United States of America
| | - John N. Aucott
- Division of Rheumatology, Department of Medicine, Lyme Disease Research Center, Johns Hopkins University School of Medicine, Baltimore, MD, United States of America
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Marvel CL, Chen L, Joyce MR, Morgan OP, Iannuzzelli KG, LaConte SM, Lisinski JM, Rosenthal LS, Li X. Quantitative susceptibility mapping of basal ganglia iron is associated with cognitive and motor functions that distinguish spinocerebellar ataxia type 6 and type 3. Front Neurosci 2022; 16:919765. [PMID: 36061587 PMCID: PMC9433989 DOI: 10.3389/fnins.2022.919765] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 07/26/2022] [Indexed: 11/13/2022] Open
Abstract
Background In spinocerebellar ataxia type 3 (SCA3), volume loss has been reported in the basal ganglia, an iron-rich brain region, but iron content has not been examined. Recent studies have reported that patients with SCA6 have markedly decreased iron content in the cerebellar dentate, coupled with severe volume loss. Changing brain iron levels can disrupt cognitive and motor functions, yet this has not been examined in the SCAs, a disease in which iron-rich regions are affected. Methods In the present study, we used quantitative susceptibility mapping (QSM) to measure tissue magnetic susceptibility (indicating iron concentration), structural volume, and normalized susceptibility mass (indicating iron content) in the cerebellar dentate and basal ganglia in people with SCA3 (n = 10) and SCA6 (n = 6) and healthy controls (n = 9). Data were acquired using a 7T Philips MRI scanner. Supplemental measures assessed motor, cognitive, and mood domains. Results Putamen volume was lower in both SCA groups relative to controls, replicating prior findings. Dentate susceptibility mass and volume in SCA6 was lower than in SCA3 or controls, also replicating prior findings. The novel finding was that higher basal ganglia susceptibility mass in SCA6 correlated with lower cognitive performance and greater motor impairment, an association that was not observed in SCA3. Cerebellar dentate susceptibility mass, however, had the opposite relationship with cognition and motor function in SCA6, suggesting that, as dentate iron is depleted, it relocated to the basal ganglia, which contributed to cognitive and motor decline. By contrast, basal ganglia volume loss, rather than iron content, appeared to drive changes in motor function in SCA3. Conclusion The associations of higher basal ganglia iron with lower motor and cognitive function in SCA6 but not in SCA3 suggest the potential for using brain iron deposition profiles beyond the cerebellar dentate to assess disease states within the cerebellar ataxias. Moreover, the role of the basal ganglia deserves greater attention as a contributor to pathologic and phenotypic changes associated with SCA.
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Affiliation(s)
- Cherie L. Marvel
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Lin Chen
- F.M. Kirby Research Center for Functional Brain Imaging, Kennedy Krieger Institute, Baltimore, MD, United States
- Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Michelle R. Joyce
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Owen P. Morgan
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Katherine G. Iannuzzelli
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Stephen M. LaConte
- Fralin Biomedical Research Institute at VTC, Virginia Tech, Roanoke, VA, United States
- Biomedical Engineering and Mechanics, Virginia Tech, Blacksburg, VA, United States
| | - Jonathan M. Lisinski
- Fralin Biomedical Research Institute at VTC, Virginia Tech, Roanoke, VA, United States
| | - Liana S. Rosenthal
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, United States
| | - Xu Li
- F.M. Kirby Research Center for Functional Brain Imaging, Kennedy Krieger Institute, Baltimore, MD, United States
- Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD, United States
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Monick AJ, Joyce MR, Chugh N, Creighton JA, Morgan OP, Strain EC, Marvel CL. Characterization of basal ganglia volume changes in the context of HIV and polysubstance use. Sci Rep 2022; 12:4357. [PMID: 35288604 PMCID: PMC8921181 DOI: 10.1038/s41598-022-08364-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 03/04/2022] [Indexed: 11/10/2022] Open
Abstract
HIV and psychoactive substances can impact the integrity of the basal ganglia (BG), a neural substrate of cognition, motor control, and reward-seeking behaviors. This study assessed BG gray matter (GM) volume as a function of polysubstance (stimulant and opioid) use and HIV status. We hypothesized that comorbid polysubstance use and HIV seropositivity would alter BG GM volume differently than would polysubstance use or HIV status alone. We collected structural MRI scans, substance use history, and HIV diagnoses. Participants who had HIV (HIV +), a history of polysubstance dependence (POLY +), both, or neither completed assessments for cognition, motor function, and risk-taking behaviors (N = 93). All three clinical groups showed a left-lateralized pattern of GM reduction in the BG relative to controls. However, in the HIV + /POLY + group, stimulant use was associated with increased GM volume within the globus pallidus and putamen. This surpassed the effects from opioid use, as indicated by decreased GM volume throughout the BG in the HIV-/POLY + group. Motor learning was impaired in all three clinical groups, and in the HIV + /POLY + group, motor learning was associated with increased caudate and putamen GM volume. We also observed associations between BG GM volume and risk-taking behaviors in the HIV + /POLY- and HIV-/POLY + groups. The effects of substance use on the BG differed as a function of substance type used, HIV seropositivity, and BG subregion. Although BG volume decreased in association with HIV and opioid use, stimulants can, inversely, lead to BG volume increases within the context of HIV.
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Fischer NM, Hinkle JT, Perepezko K, Bakker CC, Morris M, Broen MP, Butala A, Dawson TM, Leentjens AF, Mari Z, Marvel CL, Mills KA, Rosenthal LS, Shepard MD, Pantelyat A, Bakker A, Pletnikova O, Troncoso JC, Wang J, Pontone GM. Brainstem Pathologies Correlate With Depression and Psychosis in Parkinson's Disease. Am J Geriatr Psychiatry 2021; 29:958-968. [PMID: 33455856 PMCID: PMC8277871 DOI: 10.1016/j.jagp.2020.12.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [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: 08/30/2020] [Revised: 11/30/2020] [Accepted: 12/12/2020] [Indexed: 02/08/2023]
Abstract
BACKGROUND The pathological hallmarks of Parkinson's disease include intraneuronal Lewy bodies, neuronal loss, and gliosis. We aim to correlate Parkinson's disease neuropsychiatric symptoms, (e.g., depression, psychosis, and anxiety) with the severity of neuropathology in the substantia nigra and locus coeruleus. METHODS The brains of 175 participants with a primary pathologic diagnosis of Parkinson's disease were analyzed semi-quantitatively to ascertain the burden of neuronal loss and gliosis and Lewy body pathology within the locus coeruleus and substantia nigra. Participants' history of anxiety, depression, and psychosis were determined using a chart-extracted medical history or record of formal psychiatric evaluation. RESULTS Of the sample, 56% (n = 98), 50% (n = 88), and 31.25% (n = 55) of subjects had a diagnosis of psychosis, depression, and anxiety, respectively. Psychosis (χ2 = 7.1, p = 0.008, df = 1) and depression (χ2 = 7.2, p = 0.007, df = 1) were associated with severe neuronal loss and gliosis in the substantia nigra but not in the locus coeruleus. No association was observed between anxiety and neuronal loss and gliosis in either region. No neuropsychiatric symptoms were associated with Lewy body score. After controlling for disease duration and dementia, psychosis (odds ratio [OR]: 3.1, 95% confidence interval [CI]: 1.5-6.4, χ2 = 9.4, p = 0.012, df = 1) and depression (OR: 2.6, 95% CI: 1.3-5.0, χ2 = 7.9, p = 0.005, df = 1) remained associated with severe neuronal loss and gliosis in the substantia nigra. CONCLUSION These results suggest that psychosis and depression in Parkinson's disease are associated with the underlying neurodegenerative process and demonstrate that cell loss and gliosis may be a better marker of neuropsychiatric symptoms than Lewy body pathology.
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Affiliation(s)
- Nicole Mercado Fischer
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Jared T. Hinkle
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins School of Medicine, Baltimore, MD, United States,Medical Scientist Training Program, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Kate Perepezko
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Catherine C. Bakker
- Morris K. Udall Parkinson’s Disease Research Center of Excellence, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Meaghan Morris
- Clinical and Neuropathology Core, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Martinus P.G. Broen
- Department of Neurology, Maastricht University Medical Centre, Maastricht, the Netherlands
| | - Ankur Butala
- Department of Neurology, Johns Hopkins School of Medicine, Baltimore MD, United States
| | - Ted M. Dawson
- Department of Neurology, Johns Hopkins School of Medicine, Baltimore MD, United States,Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, Johns Hopkins School of Medicine, Baltimore, MD, United States,Solomon H. Snyder Department of Neuroscience, Johns Hopkins School of Medicine, Baltimore, MD, United States,Department of Pharmacology and Molecular Sciences, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Albert F.G. Leentjens
- Department of Psychiatry, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Zoltan Mari
- Morris K. Udall Parkinson’s Disease Research Center of Excellence, Johns Hopkins School of Medicine, Baltimore, MD, United States,Lou Ruvo Center for Brain Health, Cleveland Clinic, Las Vegas, NV, United States
| | - Cherie L. Marvel
- Department of Neurology, Johns Hopkins School of Medicine, Baltimore MD, United States
| | - Kelly A. Mills
- Morris K. Udall Parkinson’s Disease Research Center of Excellence, Johns Hopkins School of Medicine, Baltimore, MD, United States,Department of Neurology, Johns Hopkins School of Medicine, Baltimore MD, United States
| | - Liana S. Rosenthal
- Morris K. Udall Parkinson’s Disease Research Center of Excellence, Johns Hopkins School of Medicine, Baltimore, MD, United States,Department of Neurology, Johns Hopkins School of Medicine, Baltimore MD, United States
| | - Melissa D. Shepard
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Alexander Pantelyat
- Morris K. Udall Parkinson’s Disease Research Center of Excellence, Johns Hopkins School of Medicine, Baltimore, MD, United States,Department of Neurology, Johns Hopkins School of Medicine, Baltimore MD, United States
| | - Arnold Bakker
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Olga Pletnikova
- Morris K. Udall Parkinson’s Disease Research Center of Excellence, Johns Hopkins School of Medicine, Baltimore, MD, United States,Clinical and Neuropathology Core, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Juan C. Troncoso
- Morris K. Udall Parkinson’s Disease Research Center of Excellence, Johns Hopkins School of Medicine, Baltimore, MD, United States,Clinical and Neuropathology Core, Johns Hopkins School of Medicine, Baltimore, MD, United States
| | - Jiangxia Wang
- Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States
| | - Gregory M. Pontone
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins School of Medicine, Baltimore, MD, United States,Morris K. Udall Parkinson’s Disease Research Center of Excellence, Johns Hopkins School of Medicine, Baltimore, MD, United States,Department of Neurology, Johns Hopkins School of Medicine, Baltimore MD, United States
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Morgan OP, Slapik MB, Iannuzzelli KG, LaConte SM, Lisinski JM, Nopoulos PC, Cochran AM, Kronemer SI, Rosenthal LS, Marvel CL. The Cerebellum and Implicit Sequencing: Evidence from Cerebellar Ataxia. Cerebellum 2020; 20:222-245. [PMID: 33123963 DOI: 10.1007/s12311-020-01206-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/20/2020] [Indexed: 12/20/2022]
Abstract
The cerebellum recognizes sequences from prior experiences and uses this information to generate internal models that predict future outcomes in a feedforward manner [Front Hum Neurosci 8: 475, 2014; Cortex 47: 137-44, 2011; Cerebellum 7: 611-5, 2008; J Neurosci 26: 9107-16, 2006]. This process has been well documented in the motor domain, but the cerebellum's role in cognitive sequencing, within the context of implicit versus explicit processes, is not well characterized. In this study, we tested individuals with cerebellar ataxia and healthy controls to clarify the role of the cerebellum sequencing using variations on implicit versus explicit and motor versus cognitive demands across five experiments. Converging results across these studies suggest that cerebellar feedforward mechanisms may be necessary for sequencing in the implicit domain only. In the ataxia group, rhythmic tapping, rate of motor learning, and implicit sequence learning were impaired. However, for cognitive sequencing that could be accomplished using explicit strategies, the cerebellar group performed normally, as though they shifted to extra-cerebellar mechanisms to compensate. For example, when cognitive and motor functions relied on cerebellar function simultaneously, the ataxia group's motor function was unaffected, in contrast to that of controls whose motor performance declined as a function of cognitive load. These findings indicated that the cerebellum is not critical for all forms of sequencing per se. Instead, it plays a fundamental role for sequencing within the implicit domain, whether functions are motor or cognitive. Moreover, individuals with cerebellar ataxia are generally able to compensate for cognitive sequencing when explicit strategies are available in order to preserve resources for motor function.
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Affiliation(s)
- Owen P Morgan
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Mitchell B Slapik
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | | | - Stephen M LaConte
- Fralin Biomedical Research Institute at VTC, Virginia Tech, Roanoke, VA, USA
| | - Jonathan M Lisinski
- Fralin Biomedical Research Institute at VTC, Virginia Tech, Roanoke, VA, USA
| | - Peg C Nopoulos
- Department of Psychiatry, University of Iowa Carver College of Medicine, Iowa City, IA, USA
| | - Ashley M Cochran
- Department of Psychiatry, University of Iowa Carver College of Medicine, Iowa City, IA, USA
| | - Sharif I Kronemer
- Interdepartmental Neuroscience Program and the Department of Neurology, Yale University, New Haven, CT, USA
| | - Liana S Rosenthal
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Cherie L Marvel
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
- , Baltimore, MD, 21205, USA.
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Abstract
Working memory is vital for basic functions in everyday life. During working memory, one holds a finite amount of information in mind until it is no longer required or when resources to maintain this information are depleted. Convergence of neuroimaging data indicates that working memory is supported by the motor system, and in particular, by regions that are involved in motor planning and preparation, in the absence of overt movement. These "secondary motor" regions are physically located between primary motor and non-motor regions, within the frontal lobe, cerebellum, and basal ganglia, creating a functionally organized gradient. The contribution of secondary motor regions to working memory may be to generate internal motor traces that reinforce the representation of information held in mind. The primary aim of this review is to elucidate motor-cognitive interactions through the lens of working memory using the Sternberg paradigm as a model and to suggest origins of the motor-cognitive interface. In addition, we discuss the implications of the motor-cognitive relationship for clinical groups with motor network deficits.
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Affiliation(s)
- Cherie L Marvel
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA.
| | - Owen P Morgan
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Sharif I Kronemer
- Department of Neurology, Yale University, New Haven, CT, USA; Interdepartmental Neuroscience Program, Yale University, New Haven, CT, USA
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Wong AL, Marvel CL, Taylor JA, Krakauer JW. Can patients with cerebellar disease switch learning mechanisms to reduce their adaptation deficits? Brain 2019; 142:662-673. [PMID: 30689760 PMCID: PMC6391651 DOI: 10.1093/brain/awy334] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [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: 08/07/2018] [Revised: 11/08/2018] [Accepted: 11/15/2018] [Indexed: 11/12/2022] Open
Abstract
Systematic perturbations in motor adaptation tasks are primarily countered by learning from sensory-prediction errors, with secondary contributions from other learning processes. Despite the availability of these additional processes, particularly the use of explicit re-aiming to counteract observed target errors, patients with cerebellar degeneration are surprisingly unable to compensate for their sensory-prediction error deficits by spontaneously switching to another learning mechanism. We hypothesized that if the nature of the task was changed-by allowing vision of the hand, which eliminates sensory-prediction errors-patients could be induced to preferentially adopt aiming strategies to solve visuomotor rotations. To test this, we first developed a novel visuomotor rotation paradigm that provides participants with vision of their hand in addition to the cursor, effectively setting the sensory-prediction error signal to zero. We demonstrated in younger healthy control subjects that this promotes a switch to strategic re-aiming based on target errors. We then showed that with vision of the hand, patients with cerebellar degeneration could also switch to an aiming strategy in response to visuomotor rotations, performing similarly to age-matched participants (older controls). Moreover, patients could retrieve their learned aiming solution after vision of the hand was removed (although they could not improve beyond what they retrieved), and retain it for at least 1 year. Both patients and older controls, however, exhibited impaired overall adaptation performance compared to younger healthy controls (age 18-33 years), likely due to age-related reductions in spatial and working memory. Patients also failed to generalize, i.e. they were unable to adopt analogous aiming strategies in response to novel rotations. Hence, there appears to be an inescapable obligatory dependence on sensory-prediction error-based learning-even when this system is impaired in patients with cerebellar disease. The persistence of sensory-prediction error-based learning effectively suppresses a switch to target error-based learning, which perhaps explains the unexpectedly poor performance by patients with cerebellar degeneration in visuomotor adaptation tasks.
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Affiliation(s)
- Aaron L Wong
- Moss Rehabilitation Research Institute, Elkins Park, PA, USA
| | - Cherie L Marvel
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Jordan A Taylor
- Department of Psychology, Princeton University, Princeton, NJ, USA
| | - John W Krakauer
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
- Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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Hinkle JT, Perepezko K, Bakker CC, Dawson TM, Johnson V, Mari Z, Marvel CL, Mills KA, Pantelyat A, Pletnikova O, Rosenthal LS, Shepard MD, Stevens DA, Troncoso JC, Wang J, Pontone GM. Domain-specific cognitive impairment in non-demented Parkinson's disease psychosis. Int J Geriatr Psychiatry 2018; 33:e131-e139. [PMID: 28509347 PMCID: PMC5698175 DOI: 10.1002/gps.4736] [Citation(s) in RCA: 8] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Accepted: 04/10/2017] [Indexed: 11/10/2022]
Abstract
INTRODUCTION In Parkinson's disease (PD), psychosis is associated with cognitive impairment that may be more profound in particular cognitive domains. Our goal was to determine whether psychosis in non-demented PD participants is associated with domain-specific cognitive impairment on the Mini-Mental State Exam (MMSE). METHODS The Morris K. Udall Parkinson's Disease Research Center of Excellence Longitudinal Study at Johns Hopkins is a prospective study that was initiated in 1998. Clinical assessments are conducted at two-year intervals at the Johns Hopkins Hospital. We analyzed data from 137 enrolled participants with idiopathic PD. Psychosis diagnoses were established by psychiatrist interview per DSM-IV criteria. An incident dementia diagnosis resulted in exclusion from analysis for that evaluation and any future evaluations in that participant. We used logistic regression with generalized estimated equations (GEE) to model the time-varying relationship between MMSE subscale scores and psychosis, adjusting for potential confounding variables identified through univariable analysis. RESULTS Thirty-one unique psychosis cases were recorded among non-demented participants. Fifty total evaluations with psychosis present were analyzed. In multivariable regressions, psychosis was associated with lower scores on the orientation (relative odds ratio, rOR: 0.73; 95% CI: 0.58-0.93; p = 0.011), language (rOR: 0.64; 95% CI: 0.48-0.86; p = 0.003), and intersecting pentagon (rOR: 0.43; 95% CI: 0.20-0.92 p = 0.030) subscales of the MMSE. CONCLUSIONS In PD, executive dysfunction, disorientation, and impaired language comprehension may be associated with psychosis. Our findings suggest that the corresponding MMSE subscales may be useful in identifying participants with a higher likelihood of developing psychosis. Copyright © 2017 John Wiley & Sons, Ltd.
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Affiliation(s)
- Jared T. Hinkle
- Medical Scientist Training Program, Johns Hopkins University School of Medicine, Baltimore, MD, USA,Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Kate Perepezko
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Catherine C. Bakker
- Morris K. Udall Parkinson’s Disease Research Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Ted M. Dawson
- Morris K. Udall Parkinson’s Disease Research Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA,Movement Disorders Division, Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA,Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, Baltimore, MD, USA,Solomon H. Snyder Department of Neuroscience, Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA,Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Vanessa Johnson
- Movement Disorders Division, Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Zoltan Mari
- Morris K. Udall Parkinson’s Disease Research Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA,Movement Disorders Division, Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Cherie L. Marvel
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA,Cognitive Neuroscience Division, Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Kelly A. Mills
- Movement Disorders Division, Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Alexander Pantelyat
- Morris K. Udall Parkinson’s Disease Research Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA,Movement Disorders Division, Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Olga Pletnikova
- Morris K. Udall Parkinson’s Disease Research Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA,Clinical and Neuropathology Core, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Liana S. Rosenthal
- Morris K. Udall Parkinson’s Disease Research Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA,Movement Disorders Division, Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Melissa D. Shepard
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Daniel A. Stevens
- Medical Scientist Training Program, Johns Hopkins University School of Medicine, Baltimore, MD, USA,Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Juan C. Troncoso
- Morris K. Udall Parkinson’s Disease Research Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA,Clinical and Neuropathology Core, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Jiangxia Wang
- Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Gregory M. Pontone
- Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD, USA,Morris K. Udall Parkinson’s Disease Research Center, Johns Hopkins University School of Medicine, Baltimore, MD, USA
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10
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Hinkle JT, Perepezko K, Bakker CC, Broen MPG, Chin K, Dawson TM, Johnson V, Mari Z, Marvel CL, Mills KA, Pantelyat A, Pletnikova O, Rosenthal LS, Shepard MD, Stevens DA, Troncoso JC, Wang J, Pontone GM. Onset and Remission of Psychosis in Parkinson's Disease: Pharmacologic and Motoric Markers. Mov Disord Clin Pract 2018; 5:31-38. [PMID: 29756003 PMCID: PMC5945218 DOI: 10.1002/mdc3.12550] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Revised: 08/10/2017] [Accepted: 08/18/2017] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Psychosis is among the most disabling complications of Parkinson's disease (PD). The chronicity of PD psychosis remains understudied and the relative importance of dopaminergic therapy versus the disease process itself in engendering psychosis remains unclear. OBJECTIVES To examine pharmacologic and motoric correlates of PD psychosis onset and remission in a longitudinally monitored PD cohort. METHODS We analyzed data from 165 participants enrolled in a longitudinal PD study through the Morris K. Udall Parkinson's Disease Research Center of Excellence at Johns Hopkins University. Evaluations included formal psychiatric assessment and were conducted at two-year intervals. Regression with generalized estimated equations (GEE) was used to produce unadjusted and adjusted estimates for time-varying longitudinal associations between psychosis and putative risk factors. RESULTS Sixty-two participants (37.6%) were diagnosed with psychosis during at least one evaluation. Of forty-nine participants with psychosis followed over multiple evaluations, 13 (26.5%) demonstrated remission despite significant Hoehn & Yahr stage increase (p=0.009); two of these cases later relapsed. Multivariable regression with GEE identified dementia diagnosis, akinesia-rigidity, anticholinergic usage, and levodopa-carbidopa dose to be significantly associated with psychosis, while disease duration was not. A sub-analysis of 30 incident psychosis cases suggested that dopamine agonist dose was lowered after psychosis onset with a compensatory increase in levodopa-carbidopa dosage. CONCLUSIONS Our findings suggest that in the context of standard therapy, PD-related psychotic disorder can remit at a frequency of approximately 27%. Additionally, akinetic-rigid motor impairment was more strongly associated with psychosis than disease duration, independent of cognitive impairment and medications.
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Affiliation(s)
- Jared T. Hinkle
- Medical Scientist Training ProgramJohns Hopkins School of MedicineBaltimoreMarylandUSA
- Department of Psychiatry and Behavioral SciencesJohns Hopkins School of MedicineBaltimoreMarylandUSA
| | - Kate Perepezko
- Department of Psychiatry and Behavioral SciencesJohns Hopkins School of MedicineBaltimoreMarylandUSA
| | - Catherine C. Bakker
- Morris K. Udall Parkinson's Disease Research CenterJohns Hopkins School of MedicineBaltimoreMarylandUSA
| | - Martijn P. G. Broen
- Department of NeurologyMaastricht University Medical CentreMaastrichtthe Netherlands
| | - Kathleen Chin
- Department of NeurologyJohns Hopkins School of MedicineBaltimoreMarylandUSA
| | - Ted M. Dawson
- Morris K. Udall Parkinson's Disease Research CenterJohns Hopkins School of MedicineBaltimoreMarylandUSA
- Department of NeurologyJohns Hopkins School of MedicineBaltimoreMarylandUSA
- Neuroregeneration and Stem Cell ProgramsInstitute for Cell EngineeringJohns Hopkins School of MedicineBaltimoreMarylandUSA
- Solomon H. Snyder Department of NeuroscienceJohns Hopkins School of MedicineBaltimoreMarylandUSA
- Department of Pharmacology and Molecular SciencesJohns Hopkins School of MedicineBaltimoreMarylandUSA
| | - Vanessa Johnson
- Department of NeurologyJohns Hopkins School of MedicineBaltimoreMarylandUSA
| | - Zoltan Mari
- Morris K. Udall Parkinson's Disease Research CenterJohns Hopkins School of MedicineBaltimoreMarylandUSA
- Department of NeurologyJohns Hopkins School of MedicineBaltimoreMarylandUSA
| | - Cherie L. Marvel
- Department of Psychiatry and Behavioral SciencesJohns Hopkins School of MedicineBaltimoreMarylandUSA
- Cognitive Neuroscience DivisionDepartment of NeurologyJohns Hopkins School of MedicineBaltimoreMarylandUSA
| | - Kelly A. Mills
- Morris K. Udall Parkinson's Disease Research CenterJohns Hopkins School of MedicineBaltimoreMarylandUSA
- Department of NeurologyJohns Hopkins School of MedicineBaltimoreMarylandUSA
| | - Alexander Pantelyat
- Morris K. Udall Parkinson's Disease Research CenterJohns Hopkins School of MedicineBaltimoreMarylandUSA
- Department of NeurologyJohns Hopkins School of MedicineBaltimoreMarylandUSA
| | - Olga Pletnikova
- Morris K. Udall Parkinson's Disease Research CenterJohns Hopkins School of MedicineBaltimoreMarylandUSA
- Clinical and Neuropathology CoreJohns Hopkins School of MedicineBaltimoreMarylandUSA
| | - Liana S. Rosenthal
- Morris K. Udall Parkinson's Disease Research CenterJohns Hopkins School of MedicineBaltimoreMarylandUSA
- Department of NeurologyJohns Hopkins School of MedicineBaltimoreMarylandUSA
| | - Melissa D. Shepard
- Department of Psychiatry and Behavioral SciencesJohns Hopkins School of MedicineBaltimoreMarylandUSA
| | - Daniel A. Stevens
- Medical Scientist Training ProgramJohns Hopkins School of MedicineBaltimoreMarylandUSA
- Department of Psychiatry and Behavioral SciencesJohns Hopkins School of MedicineBaltimoreMarylandUSA
| | - Juan C. Troncoso
- Morris K. Udall Parkinson's Disease Research CenterJohns Hopkins School of MedicineBaltimoreMarylandUSA
- Clinical and Neuropathology CoreJohns Hopkins School of MedicineBaltimoreMarylandUSA
| | - Jiangxia Wang
- Department of BiostatisticsJohns Hopkins Bloomberg School of Public HealthBaltimoreMarylandUSA
| | - Gregory M. Pontone
- Department of Psychiatry and Behavioral SciencesJohns Hopkins School of MedicineBaltimoreMarylandUSA
- Morris K. Udall Parkinson's Disease Research CenterJohns Hopkins School of MedicineBaltimoreMarylandUSA
- Department of NeurologyJohns Hopkins School of MedicineBaltimoreMarylandUSA
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11
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Thomas HS, Brodsky MB, Ewen JB, Bergey GK, Lloyd TE, Haughey NJ, Marvel CL. Internal grant review to increase grant funding for junior investigators. Ann Neurol 2017; 82:497-502. [PMID: 28869672 DOI: 10.1002/ana.25040] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Revised: 08/01/2017] [Accepted: 08/27/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Heather S Thomas
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Martin B Brodsky
- Department of Physical Medicine and Rehabilitation, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Joshua B Ewen
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD.,Department of Neurology and Developmental Medicine, Kennedy Krieger Institute, Baltimore, MD
| | - Gregory K Bergey
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Thomas E Lloyd
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Norman J Haughey
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD
| | - Cherie L Marvel
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD
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12
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Abstract
Human immunodeficiency virus (HIV) became a treatable illness with the introduction of combination antiretroviral therapy (CART). As a result, patients with regular access to CART are expected to live decades with HIV. Long-term HIV infection presents unique challenges, including neurocognitive impairments defined by three major stages of HIV-associated neurocognitive disorders (HAND). The current investigation aimed to study cognitive and motor impairments in HIV using a novel multitasking paradigm. Unlike current standard measures of cognitive and motor performance in HIV, multitasking increases real-world validity by mimicking the dual motor and cognitive demands that are part of daily professional and personal settings (e.g., driving, typing and writing). Moreover, multitask assessments can unmask compensatory mechanisms, normally used under single task conditions, to maintain performance. This investigation revealed that HIV+ participants were impaired on the motor component of the multitask, while cognitive performance was spared. A patient-specific positive interaction between motor performance and working memory recall was driven by poor HIV+ multitaskers. Surprisingly, HAND stage did not correspond with multitask performance and a variety of commonly used assessments indicated normal motor function among HIV+ participants with poor motor performance during the experimental task. These results support the use of multitasks to reveal otherwise hidden impairment in chronic HIV by expanding the sensitivity of clinical assessments used to determine HAND stage. Future studies should examine the capability of multitasks to predict performance in personal, professional and health-related behaviors and prognosis of patients living with chronic HIV.
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Affiliation(s)
- Sharif I Kronemer
- Department of Neurology, Johns Hopkins School of MedicineBaltimore, MD, USA.,Department of Neuroscience, Yale UniversityNew Haven, CT, USA
| | - Jordan A Mandel
- Department of Neurology, Johns Hopkins School of MedicineBaltimore, MD, USA
| | - Ned C Sacktor
- Department of Neurology, Johns Hopkins School of MedicineBaltimore, MD, USA
| | - Cherie L Marvel
- Department of Neurology, Johns Hopkins School of MedicineBaltimore, MD, USA.,Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of MedicineBaltimore, MD, USA
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13
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Anderson BA, Kronemer SI, Rilee JJ, Sacktor N, Marvel CL. Reward, attention, and HIV-related risk in HIV+ individuals. Neurobiol Dis 2015; 92:157-65. [PMID: 26484383 DOI: 10.1016/j.nbd.2015.10.018] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [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: 05/14/2015] [Revised: 10/04/2015] [Accepted: 10/16/2015] [Indexed: 01/15/2023] Open
Abstract
Human immunodeficiency virus (HIV) is often contracted through engaging in risky reward-motivated behaviors such as needle sharing and unprotected sex. Understanding the factors that make an individual more vulnerable to succumbing to the temptation to engage in these risky behaviors is important to limiting the spread of HIV. One potential source of this vulnerability concerns the degree to which an individual is able to resist paying attention to irrelevant reward information. In the present study, we examine this possible link by characterizing individual differences in value-based attentional bias in a sample of HIV+ individuals with varying histories of risk-taking behavior. Participants learned associations between experimental stimuli and monetary reward outcome. The degree of attentional bias for these reward-associated stimuli, reflected in their ability to capture attention when presented as task-irrelevant distractors, was then assessed both immediately and six months following reward learning. Value-driven attentional capture was related to substance abuse history and non-planning impulsiveness during the time leading up to contraction of HIV as measured via self-report. These findings suggest a link between the ability to ignore reward-associated information and prior HIV-related risk-taking behavior. Additionally, particular aspects of HIV-associated neurocognitive disorders were related to attentional bias, including motor deficits commonly associated with HIV-induced damage to the basal ganglia.
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Affiliation(s)
- Brian A Anderson
- Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, MD 21218, United States.
| | - Sharif I Kronemer
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, United States
| | - Jessica J Rilee
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, United States
| | - Ned Sacktor
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, United States
| | - Cherie L Marvel
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, United States; Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21205, United States
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14
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Liao DA, Kronemer SI, Yau JM, Desmond JE, Marvel CL. Motor system contributions to verbal and non-verbal working memory. Front Hum Neurosci 2014; 8:753. [PMID: 25309402 PMCID: PMC4173669 DOI: 10.3389/fnhum.2014.00753] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [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: 07/09/2014] [Accepted: 09/07/2014] [Indexed: 11/28/2022] Open
Abstract
Working memory (WM) involves the ability to maintain and manipulate information held in mind. Neuroimaging studies have shown that secondary motor areas activate during WM for verbal content (e.g., words or letters), in the absence of primary motor area activation. This activation pattern may reflect an inner speech mechanism supporting online phonological rehearsal. Here, we examined the causal relationship between motor system activity and WM processing by using transcranial magnetic stimulation (TMS) to manipulate motor system activity during WM rehearsal. We tested WM performance for verbalizable (words and pseudowords) and non-verbalizable (Chinese characters) visual information. We predicted that disruption of motor circuits would specifically affect WM processing of verbalizable information. We found that TMS targeting motor cortex slowed response times (RTs) on verbal WM trials with high (pseudoword) vs. low (real word) phonological load. However, non-verbal WM trials were also significantly slowed with motor TMS. WM performance was unaffected by sham stimulation or TMS over visual cortex (VC). Self-reported use of motor strategy predicted the degree of motor stimulation disruption on WM performance. These results provide evidence of the motor system’s contributions to verbal and non-verbal WM processing. We speculate that the motor system supports WM by creating motor traces consistent with the type of information being rehearsed during maintenance.
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Affiliation(s)
- Diana A Liao
- Department of Neurology, Johns Hopkins University School of Medicine Baltimore, MD, USA ; Neuroscience Institute, Princeton University Princeton, NJ, USA
| | - Sharif I Kronemer
- Department of Neurology, Johns Hopkins University School of Medicine Baltimore, MD, USA
| | - Jeffrey M Yau
- Department of Neurology, Johns Hopkins University School of Medicine Baltimore, MD, USA ; Department of Neuroscience, Baylor College of Medicine Houston, TX, USA
| | - John E Desmond
- Department of Neurology, Johns Hopkins University School of Medicine Baltimore, MD, USA
| | - Cherie L Marvel
- Department of Neurology, Johns Hopkins University School of Medicine Baltimore, MD, USA ; Department of Psychiatry and Behavioral Sciences, Johns Hopkins University School of Medicine Baltimore, MD, USA
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15
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Abstract
Attentional biases for drug-related stimuli play a prominent role in addiction, predicting treatment outcomes. Attentional biases also develop for stimuli that have been paired with nondrug rewards in adults without a history of addiction, the magnitude of which is predicted by visual working-memory capacity and impulsiveness. We tested the hypothesis that addiction is associated with an increased attentional bias for nondrug (monetary) reward relative to that of healthy controls, and that this bias is related to working-memory impairments and increased impulsiveness. Seventeen patients receiving methadone-maintenance treatment for opioid dependence and 17 healthy controls participated. Impulsiveness was measured using the Barratt Impulsiveness Scale (BIS-11; Patton, Stanford, & Barratt, 1995), visual working-memory capacity was measured as the ability to recognize briefly presented color stimuli, and attentional bias was measured as the magnitude of response time slowing caused by irrelevant but previously reward-associated distractors in a visual-search task. The results showed that attention was biased toward the distractors across all participants, replicating previous findings. It is important to note, this bias was significantly greater in the patients than in the controls and was negatively correlated with visual working-memory capacity. Patients were also significantly more impulsive than controls as a group. Our findings demonstrate that patients in treatment for addiction experience greater difficulty ignoring stimuli associated with nondrug reward. This nonspecific reward-related bias could mediate the distracting quality of drug-related stimuli previously observed in addiction.
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Affiliation(s)
- Brian A. Anderson
- Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, MD 21218
| | - Monica L. Faulkner
- Department of Neurology, Division of Cognitive Neuroscience, Johns Hopkins University, Baltimore, MD 21205
| | - Jessica J. Rilee
- Department of Neurology, Division of Cognitive Neuroscience, Johns Hopkins University, Baltimore, MD 21205
| | - Steven Yantis
- Department of Psychological and Brain Sciences, Johns Hopkins University, Baltimore, MD 21218
| | - Cherie L. Marvel
- Department of Neurology, Division of Cognitive Neuroscience, Johns Hopkins University, Baltimore, MD 21205,Department of Psychiatry and Behavioral Sciences, Johns Hopkins University, Baltimore, MD 21205
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16
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Marvel CL, Faulkner ML, Strain EC, Mintzer MZ, Desmond JE. An fMRI investigation of cerebellar function during verbal working memory in methadone maintenance patients. Cerebellum 2012; 11:300-10. [PMID: 21892700 PMCID: PMC3248617 DOI: 10.1007/s12311-011-0311-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Working memory is impaired in opioid-dependent individuals, yet the neural underpinnings of working memory in this population are largely unknown. Previous studies in healthy adults have demonstrated that working memory is supported by a network of brain regions that includes a cerebro-cerebellar circuit. The cerebellum, in particular, may be important for inner speech mechanisms that assist verbal working memory. This study used functional magnetic resonance imaging to examine brain activity associated with working memory in five opioid-dependent, methadone-maintained patients and five matched, healthy controls. An item recognition task was administered in two conditions: (1) a low working memory load "match" condition in which participants determined whether target letters presented at the beginning of the trial matched a probe item, and (2) a high working memory load "manipulation" condition in which participants counted two alphabetical letters forward of each of the targets and determined whether either of these new items matched a probe item. Response times and accuracy scores were not significantly different between the groups. FMRI analyses indicated that, in association with higher working memory load ("manipulation" condition), the patient group exhibited hyperactivity in the superior and inferior cerebellum and amygdala relative to that of controls. At a more liberal statistical threshold, patients exhibited hypoactivity in the left prefrontal and medial frontal/pre-SMA regions. These results indicate that verbal working memory in opioid-dependent individuals involves a disrupted cerebro-cerebellar circuit and shed light on the neuroanatomical basis of working memory impairments in this population.
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Affiliation(s)
- Cherie L Marvel
- Department of Neurology, Division of Cognitive Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
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17
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Marvel CL, Desmond JE. From storage to manipulation: How the neural correlates of verbal working memory reflect varying demands on inner speech. Brain Lang 2012; 120:42-51. [PMID: 21889195 PMCID: PMC3242899 DOI: 10.1016/j.bandl.2011.08.005] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2011] [Revised: 05/28/2011] [Accepted: 08/03/2011] [Indexed: 05/27/2023]
Abstract
The ability to store and manipulate online information may be enhanced by an inner speech mechanism that draws upon motor brain regions. Neural correlates of this mechanism were examined using event-related functional magnetic resonance imaging (fMRI). Sixteen participants completed two conditions of a verbal working memory task. In both conditions, participants viewed one or two target letters. In the "storage" condition, these targets were held in mind across a delay. Then a probe letter was presented, and participants indicated by button press whether the probe matched the targets. In the "manipulation" condition, participants identified new targets by thinking two alphabetical letters forward of each original target (e.g., f→h). Participants subsequently indicated whether the probe matched the newly derived targets. Brain activity during the storage and manipulation conditions was examined specifically during the delay phase in order to directly compare manipulation versus storage processes. Activations that were common to both conditions, yet disproportionately greater with manipulation, were observed in the left inferior frontal cortex, premotor cortex, and anterior insula, bilaterally in the parietal lobes and superior cerebellum, and in the right inferior cerebellum. This network shares substrates with overt speech and may represent an inner speech pathway that increases activity with greater working memory demands. Additionally, an inverse correlation was observed between manipulation-related brain activity (on correct trials) and test accuracy in the left premotor cortex, anterior insula, and bilateral superior cerebellum. This inverse relationship may represent intensification of inner speech as one struggles to maintain performance levels.
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Affiliation(s)
- Cherie L Marvel
- Department of Neurology, Division of Cognitive Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
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18
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Abstract
Speech-both overt and covert-facilitates working memory by creating and refreshing motor memory traces, allowing new information to be received and processed. Neuroimaging studies suggest a functional topography within the sub-regions of the cerebellum that subserve verbal working memory. Medial regions of the anterior cerebellum support overt speech, consistent with other forms of motor execution such as finger tapping, whereas lateral portions of the superior cerebellum support speech planning and preparation (e.g., covert speech). The inferior cerebellum is active when information is maintained across a delay, but activation appears to be independent of speech, lateralized by modality of stimulus presentation, and possibly related to phonological storage processes. Motor (dorsal) and cognitive (ventral) channels of cerebellar output nuclei can be distinguished in working memory. Clinical investigations suggest that hyper-activity of cerebellum and disrupted control of inner speech may contribute to certain psychiatric symptoms.
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Affiliation(s)
- Cherie L Marvel
- Department of Neurology, Division of Cognitive Neuroscience, Johns Hopkins University School of Medicine, 1620 McElderry St., Reed Hall 2205B, Baltimore, MD 21205, USA.
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19
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Marvel CL, Desmond JE. The contributions of cerebro-cerebellar circuitry to executive verbal working memory. Cortex 2010; 46:880-95. [PMID: 19811779 PMCID: PMC2872048 DOI: 10.1016/j.cortex.2009.08.017] [Citation(s) in RCA: 122] [Impact Index Per Article: 8.7] [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: 10/31/2008] [Revised: 03/09/2009] [Accepted: 08/12/2009] [Indexed: 11/18/2022]
Abstract
Contributions of cerebro-cerebellar function to executive verbal working memory were examined using event-related functional magnetic resonance imaging (fMRI) while 16 subjects completed two versions of the Sternberg task. In both versions subjects were presented with two or six target letters during the encoding phase, which were held in memory during the maintenance phase. A single probe letter was presented during the retrieval phase. In the "match condition", subjects decided whether the probe matched the target letters. In the "executive condition", subjects created a new probe by counting two alphabetical letters forward (e.g., f-->h) and decided whether the new probe matched the target letters. Neural activity during the match and executive conditions was compared during each phase of the task. There were four main findings. First, cerebro-cerebellar activity increased as a function of executive load. Second, the dorsal cerebellar dentate co-activated with the supplementary motor area (SMA) during encoding. This likely represented the formation of an articulatory (motor) trajectory. Third, the ventral cerebellar dentate co-activated with anterior prefrontal regions Brodmann Area (BA) 9/46 and the pre-SMA during retrieval. This likely represented the manipulation of information and formation of a response. A functional dissociation between the dorsal "motor" dentate and "cognitive" ventral dentate agrees with neuroanatomical tract tracing studies that have demonstrated separate neural pathways involving each region of the dentate: the dorsal dentate projects to frontal motor areas (including the SMA), and the ventral dentate projects to frontal cognitive areas (including BA 9/46 and the pre-SMA). Finally, activity during the maintenance phase in BA 9, anterior insula, pre-SMA and ventral dentate predicted subsequent accuracy of response to the probe during the retrieval phase. This finding underscored the significant contribution of the pre-SMA/ventral dentate pathway--observed several seconds prior to any motor response to the probe--to executive verbal working memory.
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Affiliation(s)
- Cherie L Marvel
- Department of Neurology, Division of Cognitive Neuroscience, Johns Hopkins Medical Institutes, 1620 McElderry Street, Baltimore, MD 21205, USA.
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20
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Abstract
Twenty-seven schizophrenia spectrum patients and 25 healthy controls performed a probabilistic version of the serial reaction time task (SRT) that included sequence trials embedded within random trials. Patients showed diminished, yet measurable, sequence learning. Postexperimental analyses revealed that a group of patients performed above chance when generating short spans of the sequence. This high-generation group showed SRT learning that was similar in magnitude to that of controls. Their learning was evident from the very 1st block; however, unlike controls, learning did not develop further with continued testing. A subset of 12 patients and 11 controls performed the SRT in conjunction with positron emission tomography. High-generation performance, which corresponded to SRT learning in patients, correlated to activity in the premotor cortex and parahippocampus. These areas have been associated with stimulus-driven visuospatial processing. Taken together, these results suggest that a subset of patients who showed moderate success on the SRT used an explicit stimulus-driven strategy to process the sequential stimuli. This adaptive strategy facilitated sequence learning but may have interfered with conventional implicit learning of the overall stimulus pattern.
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Affiliation(s)
- Cherie L Marvel
- Department of Psychiatry, Roy J. and Lucille A. Carver College of Medicine, University of Iowa, USA.
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21
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Turner BM, Paradiso S, Marvel CL, Pierson R, Boles Ponto LL, Hichwa RD, Robinson RG. The cerebellum and emotional experience. Neuropsychologia 2006; 45:1331-41. [PMID: 17123557 PMCID: PMC1868674 DOI: 10.1016/j.neuropsychologia.2006.09.023] [Citation(s) in RCA: 206] [Impact Index Per Article: 11.4] [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] [Received: 06/21/2006] [Revised: 09/21/2006] [Accepted: 09/26/2006] [Indexed: 11/23/2022]
Abstract
While the role of the cerebellum in motor coordination is widely accepted, the notion that it is involved in emotion has only recently gained popularity. To date, functional neuroimaging has not been used in combination with lesion studies to elucidate the role of the cerebellum in the processing of emotional material. We examined six participants with cerebellar stroke and nine age and education matched healthy volunteers. In addition to a complete neuropsychological, neurologic, and psychiatric examination, participants underwent [15O]water positron emission tomography (PET) while responding to emotion-evoking visual stimuli. Cerebellar lesions were associated with reduced pleasant experience in response to happiness-evoking stimuli. Stroke patients reported an unpleasant experience to frightening stimuli similar to healthy controls, yet showed significantly lower activity in the right ventral lateral and left dorsolateral prefrontal cortex, amygdala, thalamus, and retrosplenial cingulate gyrus. Frightening stimuli led to increased activity in the ventral medial prefrontal, anterior cingulate, pulvinar, and insular cortex. This suggests that alternate neural circuitry became responsible for maintaining the evolutionarily critical fear response after cerebellar damage.
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Affiliation(s)
- Beth M. Turner
- Department of Psychiatry, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
- Neuroscience Program, University of Iowa, Iowa City, IA, USA
| | - Sergio Paradiso
- Department of Psychiatry, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
- Neuroscience Program, University of Iowa, Iowa City, IA, USA
- *Corresponding author. The University of Iowa Roy J. and Lucille A. Carver College of Medicine, Psychiatry Research T215 GH, Iowa City, IA 52242-1057, USA. Tel.: +1-319-384-9248; fax: +1-319-353-8656. E-mail address:
| | - Cherie L. Marvel
- Department of Psychiatry, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
| | - Ronald Pierson
- Department of Psychiatry, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
| | - Laura L. Boles Ponto
- Department of Radiology/PET Center, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
| | - Richard D. Hichwa
- Department of Radiology/PET Center, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
| | - Robert G. Robinson
- Department of Psychiatry, University of Iowa Hospitals and Clinics, Iowa City, IA, USA
- Neuroscience Program, University of Iowa, Iowa City, IA, USA
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Marvel CL, Schwartz BL, Howard DV, Howard JH. Implicit learning of non-spatial sequences in schizophrenia. J Int Neuropsychol Soc 2005; 11:659-67. [PMID: 16248901 PMCID: PMC1408630 DOI: 10.1017/s1355617705050861] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [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: 07/21/2004] [Revised: 06/17/2005] [Accepted: 06/20/2005] [Indexed: 11/07/2022]
Abstract
Recent studies have reported abnormal implicit learning of sequential patterns in patients with schizophrenia. Because these studies were based on visuospatial cues, the question remained whether patients were impaired simply due to the demands of spatial processing. This study examined implicit sequence learning in 24 patients with schizophrenia and 24 healthy controls using a non-spatial variation of the serial reaction time test (SRT) in which pattern stimuli alternated with random stimuli on every other trial. Both groups showed learning by responding faster and more accurately to pattern trials than to random trials. Patients, however, showed a smaller magnitude of sequence learning. Both groups were unable to demonstrate explicit knowledge of the nature of the pattern, confirming that learning occurred without awareness. Clinical variables were not correlated with the patients' learning deficits. Patients with schizophrenia have a decreased ability to develop sensitivity to regularly occurring sequences of events within their environment. This type of deficit may affect an array of cognitive and motor functions that rely on the perception of event regularity.
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Affiliation(s)
- Cherie L Marvel
- Mental Health Service Line, Washington DC Veterans Affairs Medical Center, Washington, DC, USA.
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Abstract
Clinicians rely on observational methods to assess obvious signs of postural abnormalities in schizophrenia, yet subtle signs of postural deficits may go unnoticed. Posture is controlled, in large part, by the cerebellum, which has been implicated in numerous reports of structural and functional deficits in schizophrenia. Given the possibility of an underlying disruption of cerebellar function in schizophrenia, this study used an objective, quantitative measure to assess the magnitude of postural stability in this disorder. A total of 36 schizophrenia patients and 36 non-psychiatric age-matched controls stood on a pressure-sensitive platform that recorded shifts in weight (body sway) through pressure points in the feet. Patients demonstrated more postural sway than did healthy controls (p<0.01). When patients with noticeable signs of tardive dyskinesia were removed from analyses, group differences remained (p<0.01). There was no significant correlation between neuroleptic medication level and degree of postural sway (r=0.16, p=0.37). These results indicate that patients with schizophrenia have subtle, yet quantifiable, disturbances in the control of posture and balance. Quantitative measures of postural sway may provide a more sensitive means of detecting disturbances of movement than do standard clinical observations alone.
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Affiliation(s)
- Cherie L Marvel
- Mental Health Service Line, Washington DC Veterans Affairs Medical Center, and Interdisciplinary Program in Neuroscience and Department of Psychiatry, Georgetown University Medical Center, Washington, DC, USA.
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Abstract
Fronto-cerebellar circuitry is implicated in word production. Data suggest that the cerebellum is involved in word search, whereas the prefrontal cortex underlies the selection of words from among competing alternatives. We explored the role of search and selection processes in word production deficits in schizophrenia patients. In Experiment 1, patients were impaired in a verb generation task under both high and low selection conditions but were more impaired in the high selection condition. In Experiment 2, when the difficulty level of search and selection conditions was equated in a word stem completion task, patients were only impaired in the search condition. Word search deficits underlie word production problems in schizophrenia, and may involve fronto-cerebellar dysfunction.
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Affiliation(s)
- Cherie L Marvel
- Mental Health Service Line, Washington DC Veterans Affairs Medical Center, USA.
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Abstract
Disorders of mood are accompanied by a range of cognitive and neurological impairments. Similar types of cognitive deficits are shared by patients with unipolar depression and bipolar disorder. Given the disparate clinical nature of these two disorders, it is interesting and informative to understand that they share common impairments in cognition. Neuro-imaging studies indicate that these impairments in both patient populations may be subserved by disruptions of the dorsal lateral and ventral medial PFC. An important problem that remains for clinicians is that some neurological symptoms are linked specifically to the adverse pharmacological effects of antidepressant agents, mood stabilizers, and neuroleptic agents. Research has shown a relation between mood and cognitive ability. Studies also have shown an association between mood and specific types of neurological dysfunction. Although few studies have examined all three symptom domains within one investigation, preliminary reports indicate that mood, cognition, and motor function may be linked to one another by complex mechanisms. Moreover, either type of abnormality that persists in the euthymic state suggests that a fundamental neural dysfunction is unaffected by treatment with existing means. Understanding the neural mechanisms that underlie mood, cognition, and movements may help to devise better treatments that do not influence cognitive or neurological functions,yet treat mood successfully.
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Affiliation(s)
- Cherie L Marvel
- Department of Psychiatry, University of Iowa Hospitals and Clinics, Roy J. and Lucille A. Carver College of Medicine, Mental Health Clinical Research Center, 200 Hawkins Drive, W278 GH, Iowa City, IA 52242-1057, USA.
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Deutsch SI, Schwartz BL, Rosse RB, Mastropaolo J, Marvel CL, Drapalski AL. Adjuvant topiramate administration: a pharmacologic strategy for addressing NMDA receptor hypofunction in schizophrenia. Clin Neuropharmacol 2003; 26:199-206. [PMID: 12897641 DOI: 10.1097/00002826-200307000-00010] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
N-methyl-d-aspartate receptor hypofunction (NRH) and its downstream consequences, especially excitotoxicity, may explain the progressive psychosocial deterioration and ventriculomegaly observed in at least some patients with schizophrenia. Topiramate has several properties that address downstream consequences of NRH. In this open-label investigation, the authors examined the salutary therapeutic effects of adjuvant topiramate in 12 patients with schizophrenia and schizoaffective disorder. Patients were selected on the basis of the presence of negative symptoms. An optimal dose of topiramate was determined for each patient during a slow 4-week titration process. Patients were maintained on topiramate and their stable antipsychotic medications for 8 weeks, after which topiramate was tapered and discontinued. Patients were followed for an additional 4 weeks on their stable antipsychotic medications. Clinical measures of efficacy (eg, Positive and Negative Syndrome Scale), cognitive measures (eg, verbal fluency, memory), and safety measures (eg, postural sway) were assessed throughout this study. Topiramate administration (average dose, 110.42 mg/day) decreased total scores on the Positive and Negative Syndrome Scale. Topiramate was also associated with a selective and reversible worsening of verbal fluency performance. These results encourage further testing of topiramate and kainate/alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid receptor antagonists in schizophrenia patients and support the heuristic model of NRH.
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Affiliation(s)
- Stephen I Deutsch
- Mental Health Service Line, Veterans Affairs Medical Center, 50 Irving Street NW, Washington, DC 20422, USA.
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Abstract
INTRODUCTION There is currently substantial literature to suggest that patients with schizophrenia are impaired on many face-processing tasks. This study investigated the specific effects of configural changes on face recognition in groups of schizophrenia patients. METHODS In Experiment 1, participants identified facial expressions in upright faces and in faces inverted from their upright orientation. Experiments 2 and 3 examined recognition memory for faces and other non-face objects presented in upright and inverted orientations. Experiment 4 explored recognition of facial identity in composite images where the top half of one face was fused to the bottom half of another face to form a new face configuration. RESULTS In each experiment, the configural change had the same effect on face recognition for the schizophenia patients as it did for control participants. Recognising inverted faces was more difficult than recognising upright faces, with a disproportionate effect of inversion on faces relative to other objects. Recognition of facial identity in face-halves was interfered with by the formation of a new face configuration. CONCLUSION Collectively, these results suggest that people with schizophrenia rely on configural information to recognise photographs of faces.
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Affiliation(s)
- Barbara L Schwartz
- Psychiatry Service, Veterans Affairs Medical Center, Washington, DC 20422, USA.
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Drapalski AL, Rosse RB, Peebles RR, Schwartz BL, Marvel CL, Deutsch SI. Topiramate improves deficit symptoms in a patient with schizophrenia when added to a stable regimen of antipsychotic medication. Clin Neuropharmacol 2001; 24:290-4. [PMID: 11586114 DOI: 10.1097/00002826-200109000-00006] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [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: 10/27/2022]
Abstract
Topiramate was shown to attenuate the severity of negative symptoms (e.g., emotional withdrawal) in a patient with schizophrenia when added to his stable regimen of antipsychotic medication. Topiramate was administered for a period of 12 weeks; during the first 4 weeks, dosage was adjusted to the maximal tolerated dose ( i.e., 175 mg/d), and, thereafter, this dosage was maintained for 8 weeks. Topiramate was studied because of recent data and hypotheses suggesting that N-methyl-D-aspartate receptor hypofunction, dampened GABAergic inhibition, and excessive stimulation of the kainic acid (KA)/alpha-amino-3-hydroxy-5-methylisoxazole-4-propionic acid (AMPA) class of glutamate receptors occur in at least some patients with schizophrenia, especially those with persistent negative symptoms and progressive psychosocial deterioration. Topiramate is a recently approved and marketed medication for the treatment of seizure disorders, whose mechanism of action includes potentiation of GABAergic neurotransmission and antagonism of KA/AMPA glutamate receptors. This case is presented because of the dramatic response of negative symptoms to the addition of topiramate. The severity of negative symptoms was assessed formally with the Negative Scale of the Positive and Negative Syndrome Scale. The negative symptoms of schizophrenia are usually resistant to most behavioral and pharmacologic interventions.
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Affiliation(s)
- A L Drapalski
- Mental Health Service Line, Department of Veterans Affairs Medical Center, Georgetown University School of Medicine, Washington, DC 20422, USA
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Mintz EM, Marvel CL, Gillespie CF, Price KM, Albers HE. Activation of NMDA receptors in the suprachiasmatic nucleus produces light-like phase shifts of the circadian clock in vivo. J Neurosci 1999; 19:5124-30. [PMID: 10366645 PMCID: PMC6782653] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/1999] [Revised: 03/25/1999] [Accepted: 03/30/1999] [Indexed: 02/12/2023] Open
Abstract
Although there is substantial evidence that glutamate mimics the effects of light on the mammalian circadian clock in vitro, it has been reported that microinjection of glutamate into the suprachiasmatic nucleus of the hypothalamus (SCN) region in vivo does not result in a pattern of phase shifts that mimic those caused by light pulses. The present study was designed to test the hypothesis that microinjection of NMDA into the SCN would induce light-like phase shifts of the circadian clock through activation of the NMDA receptor. Hamsters housed in constant darkness received microinjections of NMDA through guide cannulas aimed at the SCN region at various times throughout the circadian cycle. Wheel running was monitored as a measure of circadian phase. Microinjection of NMDA resulted in circadian phase shifts, the size and direction of which were dependent on the time of injection. The resulting phase-response curve closely resembled that of light. The circadian response showed a clear dose-dependence at circadian time (CT) 13.5 but not at CT19. Both phase delays and advances induced by NMDA were blocked by coinjection of the NMDA antagonist 2-amino-5-phosphopentanoic acid but were slightly attenuated by the non-NMDA antagonist 6-nitro-7-sulfamoylbenzo[f]quinoxaline-2,3-dione disodium. The ability of NMDA to induce phase shifts was not altered by coinjection with tetrodotoxin. These data are consistent with the hypothesis that activation of NMDA receptors is a critical step in the transmission of photic information to the SCN.
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Affiliation(s)
- E M Mintz
- Laboratory of Neuroendocrinology and Behavior, Georgia State University, Atlanta, Georgia 30303, USA
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Huhman KL, Marvel CL, Gillespie CF, Mintz EM, Albers HE. Tetrodotoxin blocks NPY-induced but not muscimol-induced phase advances of wheel-running activity in Syrian hamsters. Brain Res 1997; 772:176-80. [PMID: 9406970 DOI: 10.1016/s0006-8993(97)00831-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [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: 02/05/2023]
Abstract
During the middle of the subjective day, circadian activity rhythms in Syrian hamsters can be phase advanced by a variety of stimuli including microinjection of neuropeptide Y (NPY) or muscimol into the suprachiasmatic nucleus (SCN). It is not known, however, if these treatments shift activity rhythms by acting directly on pacemaker cells within the SCN. In the present study NPY and muscimol were microinjected with either tetrodotoxin or saline in order to determine whether classical synaptic transmission within the SCN is necessary for the phase advances produced by NPY or muscimol. Blockade of sodium-dependent action potentials within the SCN prevented NPY- but not muscimol-induced phase advances. These data, along with our previous finding that bicuculline blocks NPY-induced phase advances, suggest that NPY requires sodium-dependent action potentials within GABAergic neurons in order to phase-shift the circadian pacemaker.
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Affiliation(s)
- K L Huhman
- Department of Psychology, Georgia State University, Atlanta 30302-5010, USA.
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Abstract
This study investigated the effects of (+/-)-2-dipropylamino-8-hydroxy-1,2,3,4-tetrahydronaphthaline hydrobromide (8-OH-DPAT) on circadian rhythms in Syrian hamsters. Systemic administration of 8-OH-DPAT (0.75 mg in 150 microl saline) at circadian time 7 produced phase advances in the circadian activity rhythm. These 8-OH-DPAT-induced phase advances were blocked by microinjection of bicuculline (166 ng, 200 nl) into the suprachiasmatic nucleus, suggesting that GABAergic activity in the suprachiasmatic nucleus mediates the phase shifts produced by systemic injections of 8-OH-DPAT. Microinjection of 8-OH-DPAT (1 microg, 200 nl) or serotonin (0.7 microg, 200 nl) directly into the suprachiasmatic nucleus did not induce phase shifts at circadian time 7, suggesting that the phase shifting effects of systemic injection of 8-OH-DPAT are mediated outside the suprachiasmatic nucleus. To examine possible sites of action of 8-OH-DPAT, 8-OH-DPAT (0.5 microg (100 nl) or 1.0 microg (200 nl)) was microinjected into the intergeniculate leaflet, dorsal raphe nuclei, and the median raphe nucleus at circadian time 7. Significant phase advances were observed after microinjection into the dorsal raphe and median raphe but not the intergeniculate leaflet. These results support the hypothesis that systemic injection of serotonergic agonists can alter circadian rhythms via action in the midbrain raphe nucleus, and that the phase shifts induced by microinjection of 8-OH-DPAT into the raphe nuclei are mediated by a neurotransmitter other than serotonin within the suprachiasmatic nucleus.
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Affiliation(s)
- E M Mintz
- Department of Biology, Georgia State University, Atlanta 30303, U.S.A
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Gillespie CF, Mintz EM, Marvel CL, Huhman KL, Albers HE. GABA(A) and GABA(B) agonists and antagonists alter the phase-shifting effects of light when microinjected into the suprachiasmatic region. Brain Res 1997; 759:181-9. [PMID: 9221935 DOI: 10.1016/s0006-8993(97)00235-7] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.1] [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] [Indexed: 02/04/2023]
Abstract
GABAergic drugs have profound effects on the regulation of circadian rhythms. The present study evaluated the effects of microinjections of GABAergic drugs into the suprachiasmatic region in hamsters on phase shifts induced by light and by microinjection of a cocktail containing vasoactive intestinal peptide (VIP), peptide histidine isoleucine (PHI) and gastrin-releasing peptide (GRP). The phase-advancing effects of light at circadian time (CT) 19 were significantly reduced by microinjection of GABA(A) or GABA(B) agonists into the SCN, but were not altered by microinjection of GABA(A) or GABA(B) antagonists. Microinjection of a GABA(B) agonist also reduced the phase-delaying effects of light at CT 13.5-14 while a GABA(B) antagonist increased the phase delays caused by light. Neither GABA(B) drug altered the phase delays produced by microinjection of a peptide cocktail containing VIP, PHI, GRP. These data indicate that changes in GABA(A) or GABA(B) activity within the SCN can alter the phase-shifting effects of light on circadian rhythms and support a role for GABA in gating photic input to the circadian clock.
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Affiliation(s)
- C F Gillespie
- Department of Biology, Georgia State University, Atlanta 30303, USA
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Affiliation(s)
- K L Huhman
- Department of Biology, Georgia State University, Atlanta 30303, USA.
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Abstract
Neuropeptide Y (NPY) injected into the suprachiasmatic region 6 h before the onset of locomotor activity produces phase advances in circadian rhythms. The present study investigated whether the phase advances produced by NPY in Syrian hamsters are mediated by a Y1- or Y2-like NPY receptor by comparing the phase advancing effects of the Y1 agonist, [Leu31, Pro34]NPY, and the Y2 agonist, NPY(3-36), following their injection into the suprachiasmatic region. Microinjection of the Y2 agonist produced phase advances that were significantly greater than those produced by the microinjection of the Y1 agonist. These data support the hypothesis that the phase advancing effects of NPY in the suprachiasmatic region are mediated by a Y2-like NPY receptor, similar to results found in vitro.
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Affiliation(s)
- K L Huhman
- Department of Biology, Georgia State University, Atlanta 30303, USA
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