Simple auditory RT was measured as a function of foreperiod and reading activity before the warning signal (W) arrived. Without prewarning signal activity earlier results were confirmed, showing a continuous decrease of RT with smaller foreperiods. When reading activity preceded W, no significant difference was found between foreperiods of 0.5 to 4.0 sec., suggesting preparation for response before arrival of W at short foreperiods.
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A.F. Sanders (1965) studied this question.