Repetition effect as a function of event uncertainty, response-stimulus interval, and rank order of the event.

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Abstract
Notes that RTs for repeated events may be faster (positive recency or repetition effect) or slower (negative recency effect) than RTs for nonrepeated events. An experiment was conducted with 48 male and 12 female undergraduates to investigate how the positive and negative recency effects vary with (a) the event uncertainty, (b) the delay between a response and the next stimulus (RSI), and (c) the rank order of the event in a sequence of equivalent events. Results show that (a) under the conditions of this study there was either a positive recency effect or no effect at all; (b) the effect was larger when uncertainty was greater; (c) the effect diminished as RSI increased; and (d) the effect was larger at the beginning than at the end of a sequence of equivalent events when event uncertainty was low, while the opposite was true when event uncertainty was high. Implications for memory and expectancy hypotheses for the repetition effect are discussed. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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