Constructional apraxia as a distinctive cognitive and structural brain feature of pre-senile Alzheimer's disease

Serra, Laura, Fadda, Lucia, Perri, Roberta, Spanò, Barbara, Marra, Camillo, Castelli, Diana, Torso, Mario, Makovac, Elena, Cercignani, Mara, Caltagirone, Carlo and Bozzali, Marco (2014) Constructional apraxia as a distinctive cognitive and structural brain feature of pre-senile Alzheimer's disease. Journal of Alzheimer's Disease, 38 (2). pp. 391-402. ISSN 1387-2877

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Constructional apraxia (CA) is often, but not always, observed in patients with Alzheimer's disease (AD). CA is usually explained by impairment of either basic perceptual and motor abilities, or executive functions. This study aims to evaluate the structural correlates of CA in AD. Forty-eight patients with AD and 20 healthy age-matched controls underwent a thorough neuropsychological investigation and an MRI scan to collect high-resolution T1-weighted data. Patients were classified as having (ADca) or not having (ADnonca) CA based on performance on the Freehand copying of drawings task. T1-weighted volumes were process according to the voxel based morphometry protocol, to assess the presence of significant differences in local to grey matter volumes in patients compared to controls and in ADca compared to ADnonca. Post-hoc, the mean grey matter volume of clusters that resulted significantly different between groups was regressed against the neuropsychological scores in which the two patient groups performed differently. A pre-senile disease onset was significantly more frequent in patients with CA compared to ADnonca. ADca patients also showed worse performances than patients with ADnonca at some tests requiring the processing of visuo-spatial data and testing working memory. They also showed widespread reductions in grey matter volume, mainly located in areas known to be implicated in object recognition and localization, and in maintenance and re-orienting of spatial attention. These findings suggest that the occurrence of CA in AD is often associated with a peculiar clinical onset (i.e., pre-senile), neuropsychological profile, and distribution of grey matter atrophy.

Item Type: Article
Schools and Departments: Brighton and Sussex Medical School > Neuroscience
Subjects: R Medicine > RC Internal medicine > RC0321 Neurosciences. Biological psychiatry. Neuropsychiatry > RC0346 Neurology. Diseases of the nervous system Including speech disorders
Depositing User: Patricia Butler
Date Deposited: 27 Nov 2015 12:50
Last Modified: 24 Jul 2017 17:34
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