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Titolo:
Object identification deficits in dementia of the Alzheimer type: Combinedeffects of semantic and visual proximity
Autore:
Dixon, MJ; Bub, DN; Chertkow, H; Arguin, M;
Indirizzi:
Univ Waterloo, Dept Psychol, Waterloo, ON N2L 3G1, Canada Univ Waterloo Waterloo ON Canada N2L 3G1 ol, Waterloo, ON N2L 3G1, Canada Univ Waterloo, Douglas Hosp Res Ctr, Waterloo, ON N2L 3G1, Canada Univ Waterloo Waterloo ON Canada N2L 3G1 tr, Waterloo, ON N2L 3G1, Canada Univ Victoria, Dept Psychol, Victoria, BC V8W 2Y2, Canada Univ Victoria Victoria BC Canada V8W 2Y2 ol, Victoria, BC V8W 2Y2, Canada McGill Univ, Dept Neurol & Neurosurg, Montreal, PQ H3A 2T5, Canada McGill Univ Montreal PQ Canada H3A 2T5 surg, Montreal, PQ H3A 2T5, Canada Univ Montreal, Dept Psychol, Montreal, PQ H3C 3J7, Canada Univ Montreal Montreal PQ Canada H3C 3J7 ol, Montreal, PQ H3C 3J7, Canada
Titolo Testata:
JOURNAL OF THE INTERNATIONAL NEUROPSYCHOLOGICAL SOCIETY
fascicolo: 4, volume: 5, anno: 1999,
pagine: 330 - 345
SICI:
1355-6177(199905)5:4<330:OIDIDO>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEMORY IMPAIRMENT; SHAPE INTEGRATION; NONLIVING THINGS; KNOWLEDGE; DISEASE; RECOGNITION; CATEGORIES; AGNOSIA; PATIENT; SPECIFICITY;
Keywords:
Alzheimer's object identification deficits; semantic proximity;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Dixon, MJ Univ Waterloo, Dept Psychol, 200 Univ W, Waterloo, ON N2L 3G1, Canada Univ Waterloo 200 Univ W Waterloo ON Canada N2L 3G1 3G1, Canada
Citazione:
M.J. Dixon et al., "Object identification deficits in dementia of the Alzheimer type: Combinedeffects of semantic and visual proximity", J INT NEURO, 5(4), 1999, pp. 330-345

Abstract

Identification deficits in dementia of the Alzheimer Type (DAT) often target specific classes of objects; sparing others. Using Line drawings to uncover the etiology of such category-specific deficits may be untenable because the underlying shape primitives used to differentiate one Line drawing from another are unspecified, and object form is yoked to object meaning. We used computer generated stimuli with empirically specifiable properties in a paradigm that decoupled form and meaning. In Experiment 1 visually similar or distinct blobs were paired with semantically close or disparate labels, and participants attempted to learn these pairings. By having the same blobs stand for semantically close and disparate objects and looking at shape-label confusion rates for each type of set, form and meaning were independently assessed. Overall, visual similarity of shapes and semantic similarity of labels each exacerbated object confusions: For controls, the effects were small but significant. For DAT patients more substantial visual and semantic proximity effects were obtained. Experiment 2 demonstrated that even small changes in semantic proximity could effect significant changes in DATtask performance. Labeling 3 blobs with "lion," "tiger," and "leopard" significantly elevated DAT confusion rates compared to exactly the same blobs labeled with "lion;" "tiger," and "zebra. " In conclusion both visual similarity and semantic proximity contributed to the identification errors of DATpatients.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 11:23:35