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J Opt Soc Am A Opt Image Sci Vis. 1994 Jun;11(6):1710-9.

Human luminance pattern-vision mechanisms: masking experiments require a new model.

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Department of Psychology, University of California, Santa Barbara 93106.


A widely used model of simultaneous luminance pattern masking is based on mechanisms that sum inputs linearly and produce a response that is an S-shaped function of that sum. This model makes two predictions about masking: (1) Changing the masker spatial waveform will shift the threshold-versus-masker contrast function horizontally by a multiplicative constant. (2) Adding a second fixed-contrast masker will shift this function horizontally by an additive constant. Experimental tests do not support these predictions. The results can be explained by a new model that incorporates broadband divisive inhibition, consistent with physiology.

[Indexed for MEDLINE]

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