Effects of stimulus probability on reaction time in a number-naming task |
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Authors: | George C. Stone Enoch Callaway Iii |
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Affiliation: | a Department of Psychiatry, University of California School of Medicine, San Franciscob The Langley Porter Neuropsychiatric Institute, |
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Abstract: | Subjects were required to respond to the visual presentation of numerals by uttering syllables closely resembling the names of the numerals. Information in stimulus ensembles was varied by manipulating the number of alternative stimulus configurations that could appear, the relative frequencies of stimuli within an ensemble and the probability of a response being required. An increasing linear function was a good first approximation to the relation between reaction time and information transmission. Systematic deviations from this function were found and an attempt is made to explain them by introducing an intervening variable, “effective probability.” |
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