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Category Judgments as Functions of Flash Luminance and Duration

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Abstract

A method for obtaining suprathreshold, constant-response functions from category judgments was developed and illustrated by obtaining judgments for flashes of varying luminance and duration in the fovea. The contours show agreement with Bloch’s law; no Broca–Sulzer effect was obtained. A second experiment indicated that the method is sensitive to context effects. No reliable variation in the critical duration was found with changes in luminance level.

© 1965 Optical Society of America

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