Abstract
In a 2 by 2 by 2 factorial experiment, 12 subjects carried out a choice reaction time task. Independent variables were foreperiod duration (1.5 sec vs. 10.5 sec), stimulus degradation, and stimulus-response (S-R) compatibility. The speed of the response was measured in terms of reaction time (RT) and movement time (MT). The data showed additive effects of foreperiod duration (FPD), S-R compatibility, and stimulus degradation on RT. None of these variables had an effect on the MT. This is consistent with the hypothesis that stimulus encoding, response selection, and response execution represent independent processing stages, and suggests that FPD affects none of these stages.
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