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Are semantic errors actually semantic?: Evidence from alzheimer's disease
O Moreaud1, D David, A Charnallet
1Service de Neurologie et Neuropsychologie, Centre Hospitalier Universitaire, Grenoble, France. omoreaud@ujf-grenoble
Brain and Language
|April 13, 2001
Summary
Semantic errors in Alzheimer's disease (AD) naming tasks do not always indicate a semantic memory deficit. Unrelated errors in AD are more often linked to semantic issues than semantic errors themselves.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neurology
Background:
- Alzheimer's disease (AD) is characterized by semantic memory deficits, leading to frequent semantic errors in naming tasks.
- Previous research in aphasia suggests naming errors can stem from various processing levels, not solely semantic knowledge impairment.
Purpose of the Study:
- To investigate the underlying causes of semantic and unrelated naming errors in Alzheimer's disease.
- To determine if semantic errors in AD consistently reflect semantic knowledge deficits or other processing impairments.
Main Methods:
- Assessed naming accuracy and semantic knowledge access in 15 Alzheimer's disease patients.
- Utilized multiple-choice probe questions to evaluate semantic knowledge.
- Presented 14 objects across visual, tactile, auditory, and verbal modalities.
Main Results:
- In visual naming, 78.8% of errors were semantic and 21.2% unrelated.
- Most semantic errors (17/26) were linked to phonological retrieval deficits, not semantic knowledge loss (8/26).
- Unrelated errors were more frequently associated with semantic deficits (4/7) than semantic errors were.
Conclusions:
- Semantic errors in Alzheimer's disease do not invariably signify a deficit in semantic knowledge.
- Unrelated naming errors in AD may be more indicative of underlying semantic processing issues than semantic errors themselves.