Abstract

With a 1° field presented at 14° in the temporal retina, light-detection thresholds were determined for various numbers of flashes n, with each flash by itself subliminal. When the flash duration t equals the interval i between successive flashes, the threshold luminance I is described by the equation, I = a + (b/n t), where a and b are constants. This equation is analogous to the law of Blondel and Rey, I = a + (b/T), where T is the duration of a single flash. In fact, when t = i, and t equals 5, 10, or 20 ms, a plot of I vs T for single flashes is identical with a plot of I vs nt for multiple flashes. When the interval i is held constant at 30 ms, the total threshold energy E increases linearly with the number of flashes regardless of the durations of the identical flashes in the train. As the interval between two successive subliminal flashes increases, E increases until it reaches a value that is roughly equal to twice its initial value, and thereafter it remains constant.

© 1973 Optical Society of America

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Figures (8)

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Equations (3)

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