Abstract
Pairs of tones were judged to be “same” or “different” by four well-practiced Ss. The speed of these judgments, measured as reaction time (RT), was studied as a function of the relative probability of “same” trials and the interstimulus interval. Three levels of probability (.75,.50, and.25) and three interstimulus intervals (1 sec., 0.5 sec., and simultaneous presentation) were used. A four-way analysis of variance showed the judgment “same” to have longer RT than the judgment “different,” and the middle interval(0.5 sec.) to have a shorter reaction time than either of the other intervals. Probability did not show any significant main effect; possible reasons for this are discussed.
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1. This research was supported by a Contract (Nonr-4896(00)) between the United States Office of Naval Research and McGill University and by a research grant (9425-10) from the Defence Research Board of Canada to Dr. Dalbir Bindra.
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Nishisato, S., Wise, J.S. Relative probability, interstimulus interval, and speed of the same-different judgment. Psychon Sci 7, 59–60 (1967). https://doi.org/10.3758/BF03331077
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DOI: https://doi.org/10.3758/BF03331077