Abstract
The photopic amplitude threshold (Δ B) for a stimulus that is a sinusoidal function of space and time shows both linear and nonlinear behavior as the background level ( B) is changed. Flicker adaptation is linear at high temporal frequencies (Δ B = constant), but obeys a Weber type of nonlinearity (Δ B = kB) at low temporal frequencies. Contrast adaptation is nonlinear at all spatial frequencies, changing from Weber's law at low spatial frequencies to a DeVries-Rose type of nonlinearity (Δ B = kB ½) at high spatial frequencies. In this paper, these regions of linear and nonlinear adaptation are mapped in a general way by varying both spatial and temporal frequencies as well as the background level. The resulting spatio-temporal adaptation maps are interpreted in terms of retinal mechanisms.
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