Cite as:
Mihaylova M, Vassilev A, 1999, "Temporal integration effect on evoked potential latency and reaction time" Perception 28 ECVP Abstract Supplement

Temporal integration effect on evoked potential latency and reaction time

M Mihaylova, A Vassilev

A comparison of human visually-evoked-potential (VEP) latencies and reaction time (RT) (Mihaylova et al, 1999 Vision Research 39 699 - 705) revealed a delay of central origin in the RT to gratings of high spatial frequency (SF) in addition to the peripheral one. In the present work, we studied the contribution of temporal integration to the peripheral and central RT delay at different SFs. VEPs and RTs were simultaneously recorded to the onset of sinusoidal gratings at 0.5, 5, and 12 cycles deg^-1. Stimulus contrast was 20%, 30%, or 50%, and two stimulus durations were used: 10 and 100 ms. Decreasing stimulus duration from 100 to 10 ms did not affect the latencies of the early VEP wave and the RT at 0.5 and 5 cycles deg^-1 but strongly increased RT to 12 cycles deg^-1 (with two exceptions at the highest contrast level). The observed difference in stimulus duration effect on VEP latency and RT suggests that the central RT delay at high SF, observed by us earlier, involves stimulus temporal integration.

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