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Investigative Ophthalmology & Visual Science, Vol 25, 980-983, Copyright © 1984 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

VEPs in humans reveal high and low spatial contrast mechanisms

P Bobak, I Bodis-Wollner, C Harnois and J Thornton

The effect of contrast on visual evoked potential (VEP) amplitude was examined in nine observers. A 6.0 cycles/deg (cpd) grating was modulated in an "on-off" mode at 7.5 Hz. The VEP response contains significant first and second harmonic components: their growth with contrast is parallel, each function consisting of two limbs. The data are consistent with the hypothesis that the pattern VEP obtained with "on-off" presentation may reflect the contributions of "low" and "high" contrast neuronal populations demonstrated in physiological studies of the primate.


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