ABSTRACT
Twenty colored sectors were arranged on a disk in the sequence of the color circle. Colors were equidistant on the Munsell hue scale and had identical value and chroma notations. When the disks were rotated at approximately 7 revolutions/sec, the perceived hues varied with the direction of rotation. The temporal sequence purple, blue, green, yellow, red (counterclockwise rotation) elicited perception of blue-green and yellow-red, whereas the opposite sequence (clockwise rotation) led to the perception of red-purple and green. These colors were seen either as sectors or as diffuse patches without any clear demarcation between them. The difference in perceived hue is attributed to mutual inhibition between DeValois' opponent color processes at the level of the lateral geniculate nucleus.
