Separating perceptual and decisional attention processes in the identification and categorization of integral-dimension stimuli.

Full Abstract

Four observers performed matching, identification, and categorization with stimuli that varied along the integral dimensions:
brightness and saturation. General recognition theory (F. G. Ashby & J. T. Townsend, 1986) was applied to quantify the separate influences of perceptual and decisional processes within and across tasks, with a focus on separating perceptual from decisional attention processes. Good accounts of the identification data were obtained from perceptual matching representation. This perceptual representation provided a good account of the categorization data, except when decisional selective attention to 1 stimulus dimension was required. Decisional selective attention reduced the attended-dimension perceptual variance relative to the unattended-dimension perceptual variance, with a larger reduction resulting when brightness, as opposed to saturation was attended. Implications for color vision research are discussed.

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Author information

Author/s: Maddox, W Todd (WT); Dodd, Jeffrey L (JL);

Affiliation: Department of Psychology, University of Texas, Austin 78712, USA. maddox@psy.utexas.edu

Grants: R01 MH59196 (Agency:United States NIMH)

Journal and publication information

Publication Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S.; Research Support, U.S. Gov't, P.H.S.

Journal: Journal of experimental psychology. Learning, memory, and cognition (J Exp Psychol Learn Mem Cogn), published in United States. (Language: eng)

Reference: 2003-May; vol 29 (issue 3) : pp 467-80

Dates: Created 2003/06/02; Completed 2003/09/17; Revised 2007/11/14;

PMID: 12776757, status: MEDLINE (last retrieval date: 11/6/2008)

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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