In:
Visual Neuroscience, Cambridge University Press (CUP), Vol. 15, No. 4 ( 1998-04), p. 607-624
Abstract:
We report VEP studies which delineate interactions
between chromatic and luminance contrast signals. We examined responses to sinusoidal luminance gratings undergoing 4-Hz
square-wave contrast reversal, upon which standing gratings with various admixtures of luminance and chromatic contrast
were alternately superimposed and withdrawn. The presence of the standing grating induced a VEP component at the
fundamental frequency of the contrast-reversal grating. This VEP component appeared without any appreciable lag,
and did not vary in amplitude over the 4 s during which the standing grating was present. The observed fundamental
response differed from the fundamental component that would be expected from the known interaction between the luminance
component of the standing grating with the modulated grating (Bodis-Wollner et al., 1972; Bobak et al., 1988), in three
ways: (1) The fundamental response was not nulled for standing gratings that were isoluminant or near-isoluminant. (2)
The chromatic dependence of the fundamental response implied an S-cone input to the interaction. (3) No single mechanism
(driven by a linear combination of cone signals) could account quantitatively for the size of this response, particularly
when the standing grating strongly modulated two cones in phase.
Type of Medium:
Online Resource
ISSN:
0952-5238
,
1469-8714
DOI:
10.1017/S0952523898154032
Language:
English
Publisher:
Cambridge University Press (CUP)
Publication Date:
1998
detail.hit.zdb_id:
1489922-X
SSG:
12
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