Changes in preparatory set as a function of event and time uncertainty.

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Abstract
Measured choice RTs to 2 equally probable events under conditions where, within a block of trials, 1 of the events (fixed) occurred with a constant foreperiod and the remaining event (variable) occurred with a uniform distribution of foreperiods. Changes in preparatory set to the variable event were produced when the foreperiod of the fixed event was systematically manipulated within the distribution of variable event foreperiods. Ss were 32 right-handed male undergraduates. Prior to the interval of the fixed event foreperiod Ss attend to the fixed event. After this duration has lapsed Ss predict with greater accuracy the onset of the variable event. When the variable event occurs at the same foreperiod as the accompanying fixed event, Ss switch their attention to this event. This switch was found to be independent of the probabilities associated with the variable event as indicated by the almost invariant RTs to this event across the fixed event conditions. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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