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Gray and White Matter Contributions to Cognitive Frontostriatal Deficits in Non-Demented Parkinson's Disease

OBJECTIVE: This prospective investigation examined: 1) processing speed and working memory relative to other cognitive domains in non-demented medically managed idiopathic Parkinson’s disease, and 2) the predictive role of cortical/subcortical gray thickness/volume and white matter fractional anisot...

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Autores principales: Price, Catherine C., Tanner, Jared, Nguyen, Peter T., Schwab, Nadine A., Mitchell, Sandra, Slonena, Elizabeth, Brumback, Babette, Okun, Michael S., Mareci, Thomas H., Bowers, Dawn
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4718544/
https://www.ncbi.nlm.nih.gov/pubmed/26784744
http://dx.doi.org/10.1371/journal.pone.0147332
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author Price, Catherine C.
Tanner, Jared
Nguyen, Peter T.
Schwab, Nadine A.
Mitchell, Sandra
Slonena, Elizabeth
Brumback, Babette
Okun, Michael S.
Mareci, Thomas H.
Bowers, Dawn
author_facet Price, Catherine C.
Tanner, Jared
Nguyen, Peter T.
Schwab, Nadine A.
Mitchell, Sandra
Slonena, Elizabeth
Brumback, Babette
Okun, Michael S.
Mareci, Thomas H.
Bowers, Dawn
author_sort Price, Catherine C.
collection PubMed
description OBJECTIVE: This prospective investigation examined: 1) processing speed and working memory relative to other cognitive domains in non-demented medically managed idiopathic Parkinson’s disease, and 2) the predictive role of cortical/subcortical gray thickness/volume and white matter fractional anisotropy on processing speed and working memory. METHODS: Participants completed a neuropsychological protocol, Unified Parkinson’s Disease Rating Scale, brain MRI, and fasting blood draw to rule out vascular contributors. Within group a priori anatomical contributors included bilateral frontal thickness, caudate nuclei volume, and prefrontal white matter fractional anisotropy. RESULTS: Idiopathic Parkinson’s disease (n = 40; Hoehn & Yahr stages 1–3) and non-Parkinson’s disease ‘control’ peers (n = 40) matched on demographics, general cognition, comorbidity, and imaging/blood vascular metrics. Cognitively, individuals with Parkinson’s disease were significantly more impaired than controls on tests of processing speed, secondary deficits on working memory, with subtle impairments in memory, abstract reasoning, and visuoperceptual/spatial abilities. Anatomically, Parkinson’s disease individuals were not statistically different in cortical gray thickness or subcortical gray volumes with the exception of the putamen. Tract Based Spatial Statistics showed reduced prefrontal fractional anisotropy for Parkinson’s disease relative to controls. Within Parkinson’s disease, prefrontal fractional anisotropy and caudate nucleus volume partially explained processing speed. For controls, only prefrontal white matter was a significant contributor to processing speed. There were no significant anatomical predictors of working memory for either group. CONCLUSIONS: Caudate nuclei volume and prefrontal fractional anisotropy, not frontal gray matter thickness, showed unique and combined significance for processing speed in Parkinson’s disease. Findings underscore the relevance for examining gray-white matter interactions and also highlight clinical processing speed metrics as potential indicators of early cognitive impairment in PD.
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spelling pubmed-47185442016-01-30 Gray and White Matter Contributions to Cognitive Frontostriatal Deficits in Non-Demented Parkinson's Disease Price, Catherine C. Tanner, Jared Nguyen, Peter T. Schwab, Nadine A. Mitchell, Sandra Slonena, Elizabeth Brumback, Babette Okun, Michael S. Mareci, Thomas H. Bowers, Dawn PLoS One Research Article OBJECTIVE: This prospective investigation examined: 1) processing speed and working memory relative to other cognitive domains in non-demented medically managed idiopathic Parkinson’s disease, and 2) the predictive role of cortical/subcortical gray thickness/volume and white matter fractional anisotropy on processing speed and working memory. METHODS: Participants completed a neuropsychological protocol, Unified Parkinson’s Disease Rating Scale, brain MRI, and fasting blood draw to rule out vascular contributors. Within group a priori anatomical contributors included bilateral frontal thickness, caudate nuclei volume, and prefrontal white matter fractional anisotropy. RESULTS: Idiopathic Parkinson’s disease (n = 40; Hoehn & Yahr stages 1–3) and non-Parkinson’s disease ‘control’ peers (n = 40) matched on demographics, general cognition, comorbidity, and imaging/blood vascular metrics. Cognitively, individuals with Parkinson’s disease were significantly more impaired than controls on tests of processing speed, secondary deficits on working memory, with subtle impairments in memory, abstract reasoning, and visuoperceptual/spatial abilities. Anatomically, Parkinson’s disease individuals were not statistically different in cortical gray thickness or subcortical gray volumes with the exception of the putamen. Tract Based Spatial Statistics showed reduced prefrontal fractional anisotropy for Parkinson’s disease relative to controls. Within Parkinson’s disease, prefrontal fractional anisotropy and caudate nucleus volume partially explained processing speed. For controls, only prefrontal white matter was a significant contributor to processing speed. There were no significant anatomical predictors of working memory for either group. CONCLUSIONS: Caudate nuclei volume and prefrontal fractional anisotropy, not frontal gray matter thickness, showed unique and combined significance for processing speed in Parkinson’s disease. Findings underscore the relevance for examining gray-white matter interactions and also highlight clinical processing speed metrics as potential indicators of early cognitive impairment in PD. Public Library of Science 2016-01-19 /pmc/articles/PMC4718544/ /pubmed/26784744 http://dx.doi.org/10.1371/journal.pone.0147332 Text en © 2016 Price et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Price, Catherine C.
Tanner, Jared
Nguyen, Peter T.
Schwab, Nadine A.
Mitchell, Sandra
Slonena, Elizabeth
Brumback, Babette
Okun, Michael S.
Mareci, Thomas H.
Bowers, Dawn
Gray and White Matter Contributions to Cognitive Frontostriatal Deficits in Non-Demented Parkinson's Disease
title Gray and White Matter Contributions to Cognitive Frontostriatal Deficits in Non-Demented Parkinson's Disease
title_full Gray and White Matter Contributions to Cognitive Frontostriatal Deficits in Non-Demented Parkinson's Disease
title_fullStr Gray and White Matter Contributions to Cognitive Frontostriatal Deficits in Non-Demented Parkinson's Disease
title_full_unstemmed Gray and White Matter Contributions to Cognitive Frontostriatal Deficits in Non-Demented Parkinson's Disease
title_short Gray and White Matter Contributions to Cognitive Frontostriatal Deficits in Non-Demented Parkinson's Disease
title_sort gray and white matter contributions to cognitive frontostriatal deficits in non-demented parkinson's disease
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4718544/
https://www.ncbi.nlm.nih.gov/pubmed/26784744
http://dx.doi.org/10.1371/journal.pone.0147332
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