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Journal Article

Citation

Palmer EM, Horowitz TS, Torralba A, Wolfe JM. J. Exp. Psychol. Hum. Percept. Perform. 2011; 37(1): 58-71.

Copyright

(Copyright © 2011, American Psychological Association)

DOI

10.1037/a0020747

PMID

21090905

PMCID

PMC3062635

Abstract

Many visual search experiments measure response time (RT) as their primary dependent variable. Analyses typically focus on mean (or median) RT. However, given enough data, the RT distribution can be a rich source of information. For this paper, we collected about 500 trials per cell per observer for both target-present and target-absent displays in each of three classic search tasks: feature search, with the target defined by color; conjunction search, with the target defined by both color and orientation; and spatial configuration search for a 2 among distractor 5s. This large data set allows us to characterize the RT distributions in detail. We present the raw RT distributions and fit several psychologically motivated functions (ex-Gaussian, ex-Wald, Gamma, and Weibull) to the data. We analyze and interpret parameter trends from these four functions within the context of theories of visual search. (PsycINFO Database Record (c) 2010 APA, all rights reserved).


Language: en

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