An experiment was conducted to determine whether both the absolute and the relative duration of the S1-S2 interval would affect the response time to the second of two successive signals (RT2) separated by an interval of brief but variable duration. Four different experimental conditions sampled different but overlapping ranges of intervals, thus allowing comparisons between RTs obtained with intervals of the same absolute but different relative durations, and conversely, with the same relative but different absolute durations. Under these conditions, RT2 varied inversely with both the absolute and the relative duration of interval over the range of intervals generally associated with psychological refractory period.
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