Journal
PERCEPTION & PSYCHOPHYSICS
Volume 62, Issue 3, Pages 425-451Publisher
PSYCHONOMIC SOC INC
DOI: 10.3758/BF03212096
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Recently quantitative models based on signal detection theory have been successfully applied to the pre diction of human accuracy in visual search for a target that differs from distracters along a single attribute (feature search). The present paper extends these models for visual search accuracy to multidimensional search displays in which the target differs from the distracters along more than one feature dimension (conjunction, disjunction, and triple conjunction displays). The model assumes that each element in the display elicits a noisy representation for each of the relevant feature dimensions. The observer combines the representations across feature dimensions to obtain a single decision variable, and the stimulus with the maximum value determines the response. The model accurately predicts human experimental data on visual search accuracy in conjunctions and disjunctions of contrast and orientation. The model accounts for performance degradation without resorting to a limited-capacity spatially localized and temporally serial mechanism by which to bind information across feature dimensions.
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