Color discrimination along the cardinal chromatic axes with VECPs as an index of function of the parvocellular pathway. Correspondence of intersubject and axis variations to psychophysics

Electroencephalography and Clinical Neurophysiology
C MacalusoM Cordella

Abstract

Chromatic information is carried only by the parvocellular pathway, giving the neurophysiologist the opportunity for eliciting specific responses. Further subdivision of the parvo chromatic system in two opponent chromatic mechanisms is potentially of great interest, given that the anatomical correlate seems to reside in subclasses of parvo ganglion cells that show differences both in size and in susceptibility to disease. We separately recorded responses arising from each chromatic opponent mechanism using visual stimuli chosen to belong to one of the "cardinal" chromatic axes. A calibrated color monitor, driven by a high resolution (14 bits/gun) computer board, was used for visualization of 1 c/deg isoluminant color gratings, sinusoidally modulated in time at 4 Hz. VECPs were recorded at several color contrasts along both cardinal axes, allowing extrapolation of contrast thresholds. Psychophysical thresholds were derived in the same stimulus conditions for comparison and found to correlate very well with the electrophysiologically derived values, both as intersubject and axis differences. The S-(L+M) opponent mechanism consistently yielded higher thresholds, smaller amplitude, and higher phase lag than the L-M mechanism. This...Continue Reading

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Citations

Jun 23, 1999·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·V Porciatti, F Sartucci
Nov 27, 1999·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·K ArakawaM Kato
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May 26, 1998·Multiple Sclerosis : Clinical and Laboratory Research·N AccorneroL Capitanio
Jan 12, 2017·Vision·Dale Purves, Chidambaram Yegappan

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