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Titolo:
A rule-based categorization deficit in Alzheimer's disease?
Autore:
Grossman, M; Robinson, K; Bernhardt, N; Koenig, P;
Indirizzi:
Univ Penn, Med Ctr, Dept Neurol, Philadelphia, PA 19104 USA Univ Penn Philadelphia PA USA 19104 pt Neurol, Philadelphia, PA 19104 USA
Titolo Testata:
BRAIN AND COGNITION
fascicolo: 2, volume: 45, anno: 2001,
pagine: 265 - 276
SICI:
0278-2626(200103)45:2<265:ARCDIA>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
SEMANTIC MEMORY IMPAIRMENT; CATEGORY KNOWLEDGE; NONLIVING THINGS; DEMENTIA; COMPREHENSION; ORGANIZATION; DISSOCIATION; ATTRIBUTES; NETWORK;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Social & Behavioral Sciences
Life Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Grossman, M Univ Penn, Med Ctr, Dept Neurol, 3 Gates,3400 Spruce St, Philadelphia, PA 19104 USA Univ Penn 3 Gates,3400 Spruce St Philadelphia PA USA 19104 USA
Citazione:
M. Grossman et al., "A rule-based categorization deficit in Alzheimer's disease?", BRAIN COGN, 45(2), 2001, pp. 265-276

Abstract

This study examined the categorization processes that Alzheimer`s disease (AD) patients use during assessments of semantic memory. Rule-based categorization involves the careful, analytic processing of strict criteria ro determine category membership, particularly for items from graded categories with ambiguous category membership; similarity-based categorization requiresan overall comparison of a test stimulus with a prototype or remembered exemplar of the category and is relatively effective for the rapid categorization of items with unambiguous category membership. To assess these processes in AD. patients were asked to decide the category membership of test stimuli for categories with poorly defined or Fuzzy boundaries (e.g.. VEGETABLE) and for categories with well-defined boundaries (e.g., FEMALE) and then ro judge the representativeness of the test stimulus for its chosen category. A subgroup of AD patients demonstrated a typical pattern of impaired semantic memory compared to healthy control subjects; that is, difficulty deciding the category membership of rest items from furry categories. Among these patients. we Found no deficit in category membership decisions about items taken from well-defined categories. We also found that AD patients and healthy controls do not differ in their representativeness judgments of items within a correctly judged category. These findings are most consistent with the hypothesis that rule-based categorization difficulty limits semanticmemory in AD. (C); 2001 Academic Press.

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Documento generato il 24/10/20 alle ore 11:11:23