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Spatial structure of chromatically opponent receptive fields in the human visual system

Published online by Cambridge University Press:  02 June 2009

Pascal Girard  and
Maria Concetta Morrone
Pascal Girard
Affiliation:
Istituto di Neurofisiologia del CNR and Scuola Normale Superiore, Pisa, Italy
Maria Concetta Morrone
Affiliation:
Istituto di Neurofisiologia del CNR and Scuola Normale Superiore, Pisa, Italy
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Abstract

This study investigates the receptive-field structure of mechanisms operating in human color vision, by recording visual evoked potentials (VEPs) to multiharmonic gratings modulated either in luminance or color (red-green). Varying the Fourier phase of the harmonics from 0 deg to 90 deg produced a family of stimulus profiles that varied from lines to edges. The stimuli were contrast reversed to elicit steady-state VEPS, and also randomly jittered (at a higher temporal frequency than the contrast reversal) to ensure that the evoked response resulted from the polarity reversal, rather than from local variation of luminance or color. Reliable VEPs were recorded from both luminance and chromatic stimuli at all phases, suggesting that the mechanisms sensitive to chromatic contrast and those sensitive to luminance contrast have both symmetric and asymmetric receptive fields. Contrast thresholds estimated by extrapolation of the contrast response curves were very similar to psychophysical thresholds for phase discrimination, suggesting that the VEP response is generated by mechanisms mediating phase discrimination. The results support the idea that human color mechanisms have receptive fields with a variety of spatial symmetries (including odd- and even-symmetric fields) and that these mechanisms may contribute to phase discrimination of chromatic stimuli in a similar way to what has been suggested for luminance vision.

Keywords

Visual evoked potentialsReceptive fieldsColor visionSpatial phaseFeature detectors
Type
Research Articles
Information
Visual Neuroscience , Volume 12 , Issue 1 , January 1995 , pp. 103 - 116
Copyright
Copyright © Cambridge University Press 1995

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