Negative afterimages and photopic luminance adaptation in human vision

Journal of the Optical Society of America. A, Optics and Image Science
C A Burbeck

Abstract

Previous studies of the negative afterimage have reported that the process responsible for these aftereffects has a bandpass spatial characteristic. If this finding is correct, then negative afterimages cannot arise from a simple, local, adaptive process. I remeasure the spatial-frequency characteristic of the negative-afterimage process by using an afterimage contrast-matching procedure with retinally stabilized stimuli and find the spatial characteristic to be constant in the low-spatial-frequency region. This finding is consistent with the theory that the negative afterimage results from local luminance adaptation. As a test of the local adaptation explanation of the negative afterimage, the effect of the negative afterimage on the temporal contrast-sensitivity function (CSF) (measured down to 0.062 Hz) is determined. The apparent contrasts of the negative afterimages associated with very slowly (less than 0.5 Hz) flickering, threshold-contrast stimuli are calculated from power-function descriptions of the temporal development of the negative afterimage, and these afterimage contrasts are then subtracted from the temporal CSF's. The resulting curves are constant for temporal frequencies below 1 Hz, indicating that the declin...Continue Reading

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Nov 26, 2009·Journal of Cognitive Neuroscience·Jan W BrascampRandolph Blake
Jan 1, 1988·Vision Research·A Bradley, C Schor
Jan 1, 1993·Journal of the Optical Society of America. A, Optics and Image Science·D H Kelly, E Martinez-Uriegas
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