Abstract

Differential thresholds for rate of photic intermittence were measured for 10 interruption rates between 2.5 and 32.5 interruptions per second, five luminance levels, and five visual angles in the central retina of the human eye. The differential threshold was found to increase as a function of interruption rate to a maximum at 15.0 interruptions per sec for low levels of luminance and 22.5 interruptions per sec for high levels of luminance, following which it decreased throughout the range of interruption rates investigated. A slight but consistent decrease in differential threshold was associated with an increase in the size of the stimulus from 0.73° to 2.83°. Further size increases yielded no measurable gains.

© 1963 Optical Society of America

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