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Modeling Disinhibition in the Early Visual Pathway

Conventional Difference of Gaussians (DoG) filter is usually used to model the early stage of visual processing. However, the convolution operation used with DoG does not explicitly account for the effects of disinhibition. Because of this, complex brightness contrast illusions such as the White effect cannot be explained using DoG filters. We discovered that a new model explicitly accounting for disinhibition allows us to explain why these brightness contrast illusions arise, and show that a feedforward filter can be derived to achieve this in a single pass.