Category-specific semantic deficits in Alzheimer's disease: a semantic priming study.

Full Abstract

Category-specific semantic deficits in individuals suffering brain damage after relatively focal lesions provide an important source of evidence about the organization of semantic knowledge. However, whether Alzheimer's disease (AD), in which the brain damage is more widespread, affects semantic categories to a different extent is still controversial. In the present study, we assess this issue by means of the semantic priming technique. AD patients with a mild impairment of their semantic knowledge showed comparable priming effects to that of controls for the categories of animals and artifacts. Interestingly, however, patients with a moderate impairment of their semantic knowledge showed a normal priming effect for animals but a very reduced priming effect (if any) for artifacts. These results reveal that AD may affect the semantic knowledge of different semantic categories to a different extent. The implications of this observation for current theoretical accounts of semantic representation in the brain are discussed.

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Author information

Author/s: Hernández, Mireia (M); Costa, Albert (A); Juncadella, Montserrat (M); Sebastián-Gallés, Núria (N); Reñé, Ramón (R);

Affiliation: GRNC, Parc Científic Universitat de Barcelona & Hospital Sant Joan de Déu, Spain.

Journal and publication information

Publication Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't

Journal: Neuropsychologia (Neuropsychologia), published in England. (Language: eng)

Reference: 2008-Mar; vol 46 (issue 4) : pp 935-46

Dates: Created 2008/02/25; Completed 2008/06/12;

PMID: 18191959, status: MEDLINE (last retrieval date: 11/6/2008)

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Aged
Aged, 80 and over
Alzheimer Disease - complications
Association
Female
Humans
Language Disorders - etiology
Logistic Models

Logistic Models
Male
Memory - physiology
Questionnaires
Reaction Time - physiology
Semantics
Task Performance and Analysis
Verbal Behavior - physiology

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