Author:
RUDVIN INGER,VALBERG ARNE
Abstract
Human visual evoked potentials (VEPs) were recorded for abrupt
reversals of 2 cycles/deg (c/deg) square-wave gratings combining
high red–green contrast with different levels of luminance contrast.
Response characteristics—2nd harmonic amplitudes and peak latencies
as a function of luminance contrast—were compared for four different
reversal rates ranging from 6.25 Hz to 12.5 Hz. At every reversal
frequency, the VEP amplitude and latency plots were nonsymmetrical with
respect to isoluminance. The amplitude dropped to a minimum within a
region of rapid phase change, always at a red–green luminance
contrast for which the green color had the higher luminance, at about 40%
or 50% Michelson luminance contrast. The rapid phase shift around this
contrast suggested a sudden change in the relative impact of VEP
generators with different latencies, possibly dominated by parvocellular
or magnocellular input. The most prominent VEP waveform through most of
the luminance contrast range, P110, is interpreted in terms of a
parvo-mediated response that is attenuated with increasing reversal
frequency. Contrast-dependent changes in the P110 amplitude appear to be
responsible for the VEP asymmetries reported here.
Publisher
Cambridge University Press (CUP)
Subject
Sensory Systems,Physiology
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