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Journal Article
Research Support, U.S. Gov't, Non-P.H.S.
Asymmetric high-contrast masking in S cone increment and decrement pathways.
Vision Research 2018 October
Physiological, anatomical, and psychophysical evidence points to important differences between visual processing of short-wave cone increments and decrement (S+ and S-) stimuli. The present study uses the pedestal discrimination paradigm to investigate potential differences, using S+ and S- tests presented on (L)ong-wave, (M)edium-wave, S, L+M, L-M, and achromatic pedestals, of both contrast polarities. Results show that high contrast 'purplish' (S+ or -(L+M)) pedestals produce substantially more masking of both S+ and S- tests than 'yellowish' (S- or +(L+M)) pedestals do. The other pedestals produce no masking. These findings suggest greater nonlinearity - either a static nonlinearity or contrast gain control - in the mechanisms responsible for the 'purplish' polarity, likely the S ON pathway.
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