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Titolo:
TOP-DOWN PROCESSES IN OBJECT IDENTIFICATION - EVIDENCE FROM EXPERIMENTAL-PSYCHOLOGY, NEUROPSYCHOLOGY AND FUNCTIONAL-ANATOMY
Autore:
HUMPHREYS GW; RIDDOCH MJ; PRICE CJ;
Indirizzi:
UNIV BIRMINGHAM,SCH PSYCHOL,COGNIT SCI RES CTR BIRMINGHAM B15 2TT W MIDLANDS ENGLAND INST NEUROL,WELLCOME DEPT COGNIT NEUROL LONDON WC1N 3BG ENGLAND
Titolo Testata:
Philosophical transactions-Royal Society of London. Biological sciences
fascicolo: 1358, volume: 352, anno: 1997,
pagine: 1275 - 1282
SICI:
0962-8436(1997)352:1358<1275:TPIOI->2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
OPTIC APHASIA; LEXICAL RETRIEVAL; SEMANTIC ERRORS; NAMING ERRORS; RECOGNITION; IMPAIRMENT; PICTURES; MEMORY; MECHANISMS; FREQUENCY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
42
Recensione:
Indirizzi per estratti:
Citazione:
G.W. Humphreys et al., "TOP-DOWN PROCESSES IN OBJECT IDENTIFICATION - EVIDENCE FROM EXPERIMENTAL-PSYCHOLOGY, NEUROPSYCHOLOGY AND FUNCTIONAL-ANATOMY", Philosophical transactions-Royal Society of London. Biological sciences, 352(1358), 1997, pp. 1275-1282

Abstract

Many models of object identification are bottom-up and serial in nature; processing at a first stage needs to be complete before it is passed on to a subsequent stage, and there is no top-down feedback from the later to the earlier stages. However, data on picture identificationin normal observers contradict a strict serial account of processing,since effects of variables on early and late stages of object identification combine in an interactive rather than an additive manner. Recent neuropsychological and functional anatomical data also indicate that object identification involves top-down activation of earlier stagesof visual processing. In neuropsychological patients, subtle perceptual deficits can produce naming problems, even when there is good access to associated semantic knowledge; in functional activation studies, there is increased activity in visual processing areas when conditionsrequire object naming relative to object recognition. These studies provide evidence that increased visual processing occurs in identification tasks, suggesting that there is re-current feedback during the identification.

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Documento generato il 04/04/20 alle ore 08:32:37