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Abstract
Evoked potentials (EP) elicited by the three basic colors show markedly different temporal characteristics. This effect is shown in new data together with a review and some replications of earlier studies. Under moderately light-adapted conditions the three color specific components of the response are 20 msec apart: red, green, and then blue. There are also marked interactions among these components, being manifested in our studies by significant variations in the latencies of the later components (green and blue).
Color specific components of the EP are enhanced by both binocular summation and by unusual electrode montage. The latter suggest that the color EP may be in part a record of subcortical processes.
Monocular and binocular comparisons were made under a variety of stimulus conditions. This approach is a highly sensitive maesure of individual differences in color strength and weaknesses, even among color-normal individuals.
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Notes on contributors
Roger W. Hintze
Joyce Laing works in the Department of Child and Family Psychiatry, Playfield House, Cupar, Fife, and is a Consultant Art Therapist to Psychiatric Hospitals and Prisons and Chairwoman of the Scottish Society of Art and Psychology.