Effects of irrelevant information in speeded discrimination.

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Abstract
Varied test stimuli in a same-different reaction time (RT) task with 12 undergraduates along 2 independent binary dimensions, size (S) and form (F). During Phase 1 (64 trials), both experimental and control groups were instructed to respond to S, ignoring F. During Phase 2 (196 trials), experimental group Ss responded on the basis of both S and F, whereas controls continued responding only to S. Phase 3 was identical to Phase 1 for both groups. Both same and different RTs were slower during Phase 1 when the irrelevant dimension was incompatible in state (same or different) to the relevant dimension. The magnitude of this effect was uninfluenced by the Phase 2 experience of the experimental group. Results are inconsistent with the view that irrelevant information has its effects in speeded discrimination through response conflict. 2 perceptual interpretations are discussed. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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