Sequential Analysis of Effects of Time Uncertainty on Choice Reaction Time

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Forepetiods (FPs) of 0.6, 2, and 4 sec. were used in a 2-choice reaction time (RT) task. Average RT increased with increase in foreperiod. A ‘negative recency RT’ effect was found where repeated RTs were slower than alternated RTs. Analysis of RTs according to position in sequences of runs reveals a similarly shaped curve for all foreperiods. The effect of increased foreperiod is to increase the RTs of all positions in the sequence. A model for this sequential effect is discussed.

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