Abstract

The effects of varying luminance and light–dark ratio (LDR) on the brightness enhancement of an intermittent light were investigated. The enhancement observed in this experiment with a train of flashes displayed the same functional relationships as the brightness enhancement found with a single flash. In both cases, increasing luminance increases brightness enhancement and decreases the optimal flash duration until an optimal luminance is reached, whereupon further increases in luminance have an opposite effect. Varying the LDR, which is the same as varying the flash duration independently of the repetition rate, increased the optimal repetition rate, while optimal flash duration and enhancement magnitude remained invariant. Interactions among the flashes were observed and appeared to be manifestations of backward and forward masking among the flashes in a train.

© 1966 Optical Society of America

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