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Parallel processing of two disjunctive targets.

Investigated the capabilities of preattentive processing by asking 27 adult Ss to report the relative location of 2 visual targets, each placed in a separate group of stimuli. In Exp I, the 2 targets differed from their distractors on the same feature dimension (shape or color) or on different dimensions. Reaction times (RTs) suggest that the 2 targets were processed simultaneously. Results imply that the preattentive processing of several stimuli can occur simultaneously along at least 2 different feature dimensions. In Exps II and III, when the target in one group of stimuli was used as the distractors in the other group, RTs increased significantly over RTs in conditions in which the distinctive feature of the targets was unique in the display. Findings indicate that conjunctions involving location provided results similar to conjunctions involving other feature dimensions. (PsycINFO Database Record (c) 2007 APA, all rights reserved)



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