Format

Send to

Choose Destination
Neuropsychology. 2006 May;20(3):319-35.

Semantic memory in Alzheimer's disease and the frontotemporal dementias: a longitudinal study of 236 patients.

Author information

1
MRC Cognition and Brain Sciences Unit, Cambridge, England. ttrogers@wisc.edu

Abstract

Using semantic dementia (SD) as a reference point, the authors assessed semantic memory in four other neurodegenerative disorders: progressive nonfluent aphasia (PNFA), frontal variant frontotemporal dementia (fvFTD), Alzheimer's disease (AD), and posterior cortical atrophy (PCA). Individuals with SD were more impaired than other groups on semantic measures and showed a characteristic pattern across tasks: category fluency (CF) worse than letter fluency (LF), naming worse than comprehension, and visual and verbal comprehension equally affected, suggesting disruption to an amodal semantic system. Individuals with AD demonstrated a similar pattern to a milder degree. Although PNFA, fvFTD, and PCA groups had abnormal scores (relative to controls) on most semantic measures, their differing patterns across measures indicate that the apparent semantic impairment in these conditions is largely secondary to other factors.

PMID:
16719625
DOI:
10.1037/0894-4105.20.3.319
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for American Psychological Association
Loading ...
Support Center