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Titolo:
Performance asymmetries in visual search demonstrate failure of independent-processing models
Autore:
Zenger, B; Fahle, M;
Indirizzi:
Stanford Univ, Dept Psychol, Stanford, CA 94305 USA Stanford Univ Stanford CA USA 94305 Dept Psychol, Stanford, CA 94305 USA City Univ London, Dept Optometry & Visual Sci, London EC1V 7DD, England City Univ London London England EC1V 7DD l Sci, London EC1V 7DD, England Ctr Cognit Sci, D-28211 Bremen, Germany Ctr Cognit Sci Bremen Germany D-28211 ognit Sci, D-28211 Bremen, Germany
Titolo Testata:
VISION RESEARCH
fascicolo: 19, volume: 40, anno: 2000,
pagine: 2677 - 2696
SICI:
0042-6989(2000)40:19<2677:PAIVSD>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
TEXTURE-DISCRIMINATION TASKS; CONTRAST DISCRIMINATION; POP-OUT; ATTENTION; VISION; STIMULUS; CONJUNCTIONS; CAPACITY; ORIENTATION; UNCERTAINTY;
Keywords:
human psychophysics; modeling; visual search; performance asymmetry; signal detection theory;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
51
Recensione:
Indirizzi per estratti:
Indirizzo: Zenger, B Stanford Univ, Dept Psychol, Stanford, CA 94305 USA Stanford Univ Stanford CA USA 94305 hol, Stanford, CA 94305 USA
Citazione:
B. Zenger e M. Fahle, "Performance asymmetries in visual search demonstrate failure of independent-processing models", VISION RES, 40(19), 2000, pp. 2677-2696

Abstract

We report psychophysical data from orientation-popout experiments that areinconsistent with a rather general decision model. Stimuli consisted of 121 line segments arranged on an 11 x 11 grid. There were two tasks: in the 1-Singleton Task all lines except one had the same orientation, and observers had to report which quadrant contained the singleton. In the 3-Singleton Task three quadrants contained orientation singletons and observers had to identify the quadrant without singleton. These tasks can be Viewed as asymmetric search tasks, in which either a singleton-quadrant has to be found among three homogeneous quadrants, or a homogeneous quadrant has to be found among three singleton-quadrants. Using tools from signal-detection theory we show that the large performance asymmetries between 1-Singleton and 3-Singleton Tasks are inconsistent with any model that makes two (Very basic andcommon) assumptions: (1) independent processing of the four quadrants and (2) an ideal-observer decision. We conclude that at least one of the two assumptions is inadequate. As a plausible reason for the model failure we suggest a global competition between salient elements that reduces popout strength when more than one singleton is present. (C) 2000 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 11/07/20 alle ore 04:38:44