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P Bobak, I Bodis-Wollner, C Harnois, J Thornton; VEPs in humans reveal high and low spatial contrast mechanisms.. Invest. Ophthalmol. Vis. Sci. 1984;25(8):980-983.
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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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