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Brightness shift in drifting ramp gratings isolates a transient mechanism.

Four experiments in which the authors served as Ss demonstrated a brightness shift for moving ramp stimuli. Data indicate that the transient visual response to changing luminance combined with the sustained response to produce an overall impression of brightness. The brightness shift is attributed to the saturation of the transient response--a limitation on the maximum transient when responding to rapid brightening or dimming. It is suggested that the brightness shift provides a new technique for isolating the responses of the transient mechanisms. (PsycINFO Database Record (c) 2007 APA, all rights reserved)



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