Abstract

By the method of binocular photometry, the present experiment has demonstrated that it is possible to reduce the magnitude of simultaneous brightness contrast through an increase in the number of inducing targets presented to an observer. This demonstration is thought to be important for two reasons: (1) it is a perceptual analog of the indirect inhibitory phenomena uncovered in the primitive eye of Limulus polyphemus; (2) it shows that interpretations of brightness contrast solely in terms of entoptic stray illumination are inadequate, since the results are the opposite of those which would be expected under a stray illumination hypothesis, i.e., the present findings involve an increase in stray illumination and a reduction in brightness contrast.

© 1962 Optical Society of America

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