Abstract
Intrasequential effects of prediction outcomes on choice reaction speed (CRS) were studied in a two-alternative reaction task. Prior to each of 300 stimulus presentations, Ss predicted the next stimulus; following each presentation, Ss identified the stimulus by pressing one of two reaction triggers. Not only was CRS faster to predicted than nonpredicted events, but given a correctly or incorrectly predicted event, CRS was significantly faster when the preceding prediction outcomes were correct than when they were incorrect. The implications of these results for dichotomous and continuous notions of expectancy are discussed.
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