Some effects of partial advance information on choice reaction with fixed or variable S-R mapping.

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Abstract
2 experiments are reported on 2-choice reaction with variable S-R mapping. In the task a signal, I, designates a mapping relation between signal, M, and response, R. Both I and M can be random variables in a trial sequence. In some conditions a value of I or of M or a neutral light was given in advance, with either ¼- or ½-sec foreperiod. Response time was examined as a function of the advance alerting and of the transition from the previous trial. Both were significant variables and there was an interaction between them indicating distinct phases in the choice process. It was also shown that with a neutral advance signal there is an optimal foreperiod in the interval 0-½ sec. with fixed mapping but not with variable mapping. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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