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Titolo:
Uncertainty, attentional capacity and chromatic mechanisms in visual search
Autore:
Monnier, P; Nagy, AL;
Indirizzi:
Univ Chicago, Dept Psychol, Chicago, IL 60637 USA Univ Chicago Chicago ILUSA 60637 go, Dept Psychol, Chicago, IL 60637 USA Univ Chicago, Dept Ophthalmol, Chicago, IL 60637 USA Univ Chicago ChicagoIL USA 60637 Dept Ophthalmol, Chicago, IL 60637 USA Univ Chicago, Dept Visual Sci, Chicago, IL 60637 USA Univ Chicago ChicagoIL USA 60637 Dept Visual Sci, Chicago, IL 60637 USA Wright State Univ, Dept Psychol, Dayton, OH 45435 USA Wright State Univ Dayton OH USA 45435 Dept Psychol, Dayton, OH 45435 USA
Titolo Testata:
VISION RESEARCH
fascicolo: 3, volume: 41, anno: 2001,
pagine: 313 - 328
SICI:
0042-6989(2001)41:3<313:UACACM>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONE-CONTRAST SPACE; SPATIAL-FREQUENCY; COLOR DISCRIMINATION; STIMULUS; TASKS; MODEL; ADAPTATION; LUMINANCE; POSITION; PATTERNS;
Keywords:
chromatic mechanisms; color; search; uncertainty;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
60
Recensione:
Indirizzi per estratti:
Indirizzo: Monnier, P Univ Chicago, Dept Psychol, 939 E 57th St, Chicago, IL 60637 USA Univ Chicago 939 E 57th St Chicago IL USA 60637 o, IL 60637 USA
Citazione:
P. Monnier e A.L. Nagy, "Uncertainty, attentional capacity and chromatic mechanisms in visual search", VISION RES, 41(3), 2001, pp. 313-328

Abstract

Two general questions were investigated using a visual search task. First,we asked whether effects of target uncertainty on reaction time varied with the discriminability of the target and distracters. Second, a higher order chromatic mechanism model was tested against a flexible model in which the signals in cardinal color-opponent mechanisms are combined through an attentional process. The models were tested by measuring the effects of targetuncertainty on search time. A regression analysis indicated that the magnitude of the uncertainty effect was approximately constant in logarithmic units as a function of the chromatic difference between the target and distracters. The constant magnitude of the uncertainty effect suggested that an attentional capacity limit was exceeded when observers were required to monitor several chromatic mechanisms at several locations. The results of experiments 3 and 4 suggested that search for chromatic targets among distracters was mediated by diagonally tuned higher order chromatic mechanisms, rather than by signals in cardinal color-opponent mechanisms that were combined through an attentional mechanism. (C) 2001 Elsevier Science Ltd. All rightsreserved.

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Documento generato il 06/04/20 alle ore 04:53:45