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Lexical and conceptual components of stem completion priming in patients with Alzheimer's disease
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Explicit memory and repetition priming in dementia: evidence for a common basic mechanism underlying conscious and unconscious retrieval deficits
Abstract: The present study was designed to assess performance of Alzheimer's (AD) and Multi-infarct (MID) demented patients on the explicit and implicit versions of two memory tasks, namely Word-Stem Completion and Word-Pair Learning. Consistently with previous studies, the AD patients were deficient on the explicit and implicit versions of both tasks. In MID patients, a dissociation emerged between normal implicit and deficient explicit Word-Stem Completion. Two multiple regression analyses were performed to evaluate patients' ability on measures of lexical-semantic competence, explicit memory, and global intellective efficiency in predicting level of repetition priming. The results demonstrate a close association between explicit and implicit memory performance in AD patients but no relation between repetition priming level and measures of lexical-semantic competence or general intelligence. Overall, the results of the present study do not support previous conceptualizations suggesting that a breakdown in the structure of semantic memory is at the root of deficient priming in demented patients. Alternative interpretations of the deficient repetition priming effect in dementia, based on a common mechanism underlying conscious and unconscious retrieval deficits, are discussed.
Keyword: Aged; Alzheimer Disease; Dementia; Female; Humans; Intelligence Tests; Male; Memory Disorders; Mental Recall; Middle Aged; Multi-Infarct; Psychological Tests; Regression Analysis; Semantics; Settore MED/26 - Neurologia; Task Performance and Analysis; Unconscious (Psychology)
URL: https://doi.org/10.1080/13803399508406580
http://hdl.handle.net/2108/66434
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