Visual evoked potential (VEP) was analyzed in 24 healthy male volunteers (age: 25–35 years) between 7.00 a.m. and 4.00 p.m. to evaluate possible diurnal variation in hemispheric differences of the response to a diffuse or 1 ° flash and checkerboard pattern-reversal (stimulation: binocular). VEP was recorded over O2–A1 and O2–A2, and 64 exposures were averaged during each session. After diffuse and 1 ° flash stimulation the amplitudes of early components (latencies < 140 ms) were higher over the right hemisphere (O2–A2) than over the left (O1–A1) in the morning. These differences disappeared during the afternoon. Late components (latencies >250 ms) exhibited higher amplitudes over the left than over the right hemisphere during the whole experiment. With checkerboard pattern-reversal stimulation such a time-dependent change in the amplitudes of VEP between both hemispheres was not measurable.

Keywords:
Visual evoked potential, Interhemispheric asymmetries, Diurnal changes
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© 1983 S. Karger AG, Basel
1983
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