Accuracy of brightness discrimination as measured by concurrent verbal responses and GSRs.

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Abstract
“In . . . subliminal perception experiments some response shows discriminative accuracy at stimulus values below the threshold of awareness determined by classical psychophysical techniques. The procedure is objectionable because the threshold measure admits extraneous variance that the measure of ‘subliminal accuracy’ does not . . ‥ This experiment compares the discriminative accuracy of GSR and verbal response when assessed by the same forced-choice psychophysical technique.” Results indicated “the verbal response showed significantly higher correlation with the stimulus than did the GSR . . . neither response was significantly more accurate than the other.” (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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