Abstract

Prolonged exposure to flickering chromatic light of moderate intensity produces a much weaker complementary afterimage than that produced by exposure to steady light of the same average intensity. This difference in adapting effectiveness was investigated by determining the retinal illuminance of the steady adapting field required to produce an afterimage equal to that produced by the flickering adapting field. In a variety of conditions, the greater effectiveness of the steady adapting field was confirmed; in several instances, a steady field having an average retinal illuminance of only 0.05 times that of the flickering field gave rise to an equally saturated afterimage. The results are taken as evidence that complementary afterimages produced by extended moderate intensity exposures are primarily a consequence of neural adaptation.

© 1978 Optical Society of America

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