Human luminance pattern-vision mechanisms: masking experiments require a new model
- 1 June 1994
- journal article
- Published by Optica Publishing Group in Journal of the Optical Society of America A
- Vol. 11 (6) , 1710-1719
- https://doi.org/10.1364/josaa.11.001710
Abstract
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.Keywords
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