An aftereffect of color which depends on the orientation of lines in the test field may be obtained by presenting a horizontal grating of one color alternately with a vertical grating of a different color. Like the aftereffect of adaptation to chromatic fringes produced by prismatic spectacles, this aftereffect is visible in monochromatic light and fails to show inter-ocular transfer. It is suggested that both effects are to be understood in terms of color adaptation of orientation-specific edge-detectors.

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"When the luminance of a stimulus field is graded along one dimension in such a way as to show at some point a sufficiently sharp but continuous decrease in luminance, a bright band is seen in the vicinity of this decrease. The present experiment was designed to investigate this band phenomenon quantitatively . . . . Two mathematical accounts of the band phenomenon, one developed by Mach and the other by Fry, fail to describe changes in width of band under the conditions giving rise to such changes in the present experiment."

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