Effects of S mapping and response modality on performance in a Stroop task

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Abstract

40 female undergraduates performed a choice reaction time task in which the stimulus was the word Red or Green printed in either red or green ink. Ss responded verbally in 1 block of trials and by keypressing in another block. For 1 group, ink color was the relevant cue, and for another group, the word was the relevant cue. Half of the Ss in each group were instructed to make the response that corresponded to the relevant cue (compatible S [stimulus-response] mapping); the other half were instructed to make the response that did not correspond (incompatible S mapping). In general, Ss who performed under compatible S mapping instructions reacted faster when the irrelevant cue corresponded to the response than when it did not. In contrast, Ss who performed under incompatible S mapping instructions reacted faster when there was a lack of correspondence between the irrelevant cue and the response than when there was correspondence. Results are consistent with a notion of logical recoding; that is, that instructing Ss to recode the relevant cue into the alternate color may have caused them to recode the irrelevant cue in the same logical manner. Results might also be interpreted to suggest that the Stroop effect is related to congruence between the relevant and the irrelevant cues rather than to correspondence between the irrelevant cue and the response. (17 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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