Effect of different motivational instructions on detection of deception with the psychological stress evaluator and the galvanic skin response

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Determined the effect of increased motivation on detection of concealed cards using the psychological stress evaluator (PSE) and the GSR. One group of 16 female and 16 male college students tried to have their card detected; the other group of 32 Ss tried to avoid detection. Two trained evaluators analyzed the PSE and GSR responses. Interrater agreement in PSE analysis averaged .65; there was significantly greater detection of cards of Ss trying to avoid detection (26.6%), but hit rates did not significantly exceed chance levels of .20 in either group. Interrater agreement in GSR analysis averaged .76; hit rates in GSR analysis were higher for Ss trying to be detected, and in both groups evaluators' hit rates significantly exceeded chance expectancy. Ss attempts to “beat the test” appeared to account for differential detection between the 2 groups. (11 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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