Retroactive brightness enhancement with brief paired flashes of light
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TL;DR
The brightness of a semi-circular test flash, when followed at varying intervals by a circular, brighter flash, was measured by a direct magnitude-estimation technique and a model accounting for this phenomenon in neurophysiological terms has been proposed.
Abstract
The brightness of a semi-circular test flash (TF), when followed at varying intervals by a circular, brighter flash (BF), was measured by a direct magnitude-estimation technique. There was a gradual increase in the brightness of the TF as the TF-BF interval was decreased. Brightness enhancement of the TF began when the interval between onsets of the two 10 msec flashes was about 150 msec and attained a maximum between 100 and 30 msec, depending upon the TF luminance. The brightness of the TF is a power function of the TF-BF interval with a negative exponent; the dimmer the TF the higher the absolute value of the exponent. A model accounting for this phenomenon in neurophysiological terms has been proposed.