Cortical plasticity is preserved in nondemented older individuals with severe ischemic small vessel disease
| Autor: | Thomas Duning, Michael Deppe, Jonathan List, Agnes Flöel, Eike Wilbers, Julia Kürten |
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| Rok vydání: | 2011 |
| Předmět: |
Male
Neuropsychological Tests Corpus callosum Brain Ischemia White matter Cognition Neuroplasticity medicine Humans Radiology Nuclear Medicine and imaging Research Articles Aged Cerebral Cortex Neuronal Plasticity Radiological and Ultrasound Technology medicine.diagnostic_test Neuropsychological test Middle Aged Executive functions Transcranial Magnetic Stimulation Hyperintensity medicine.anatomical_structure Diffusion Magnetic Resonance Imaging Neurology Anisotropy Female Neurology (clinical) Anatomy Psychology Neuroscience Diffusion MRI |
| Zdroj: | Hum Brain Mapp |
| ISSN: | 1097-0193 |
| Popis: | Ischemic small vessel disease (SVD) is a common finding on routine scans in older people, but cognitive sequelae vary considerably. To improve understanding of mechanisms underlying decline or preservation of cognitive function in this condition, we assessed cognition and cortical plasticity in 20 elderly subjects with severe SVD and 20 age‐matched controls without SVD, as rated on conventional MRI. Cognitive status was determined with a neuropsychological test battery, cortical plasticity induced with a paired associative stimulation protocol. Microstructural white matter changes were further analyzed for fractional anisotrophy using diffusion tensor imaging. We found that cortical plasticity as well as memory functions were preserved in severe SVD, while executive functions showed trendwise or significant decreases. Within the SVD group, lower white matter integrity in parahippocampal regions and posterior parts of the corpus callosum was associated with larger cortical plasticity, an association not seen for prefrontal white matter tracts. Enhanced cortical plasticity in subjects with lower white matter integrity in memory‐relevant areas might thus indicate a compensatory mechanism to counteract memory decline in severe SVD. Hum Brain Mapp, 2013. © 2012 Wiley Periodicals, Inc. |
| Databáze: | OpenAIRE |
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