The pupil size was measured in order to determine if it changes in response to checkerboard pattern-reversal stimulation by using the electronic scanning pupillometer. Transient stimulation (1 Hz) which produced transient visual evoked potentials (VEPs) caused the pupillary dilation. Its onset latency and peak latency was about 100 ms and 300 ms, respectively. Maximum change in pupil diameter was 0.12 mm. Steady-state stimulation (4 Hz) which evoked steady-state VEPs caused no measurable changes. These findings suggest that the pupillary dilation is not sufficient enough to affect the latencies of VEPs. Differential effects of the stimulus frequency on the pupillary responses and the central mechanism of the pupil dilation were also discussed.
|Number of pages||5|
|Journal||Clinical Vision Sciences|
|Publication status||Published - 1990|
All Science Journal Classification (ASJC) codes