Abstract
A series of experiments determined how the latency of a dark-adapted observer's response varies with flash luminance and flash duration. Upon receipt of a flash, observers responded by releasing a contact switch. Latency varied as a power function of luminance with simple fractional exponents: an exponent of − 1/3 for extended sources and an exponent of − ½ for a point source. To a first approximation, the exponents were independent of flash duration, spectral composition, or retinal location. Both photopic and scotopic processes gave rise to latency functions with similar exponents. For brief flashes under all stimulus conditions examined, latency was determined by the stimulus energy contained in the first 10 msec of the flash independent of flash luminance level. The invariance of the period of temporal dependence indicates a linear process in latency determination.
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