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• W2001581877 abstract "Pattern contrast discriminations is typically studied with simultaneous onset of the base contrast (C) and added contrast (ΔC) patterns. I measured contrast discrimination functions at pattern offset. A brief (30 msec) localized, spatially narrow-band D6 test stimulus was ΔC. The onset of ΔC was simultaneous with the offset of a large, 500 msec cosine pattern (the base contast C). The D6 was either positive or negative contrast, and was masked by either positive or negative contrast, i.e., a light or dark bar of the cosine pattern. Stimuli were 3 cpd. Discrimination of negative ΔC at the offset of positive contrast followed a “dipper” function, as if the OFF pathway were isolated. A dipper function was also obtained for a positive ΔC at the offset of negative contrast (ON pathway isolation). But same-polarity ΔC and C yield a monotonic dscrimination function (“bumper” function) at the offset of C, suggesting inhibitory interaction. These discrimination functions for same-and opposite-polarity ΔC and C are the reverse of functions obtained at pattern onset. Manipulations of temporal asynchrony between patterns and manipulations of pattern polarity are thus functionally equivalent in determining the form of the contrast discrimination function. In a second experiment, I determined ΔC at times before and after the offeset of a high-contrast C and manipulated pattern polarity. The time course of threshold change is different for same vs opposite-polarity test and mask. The results suggest that interaction between ON and OFF pathway is delayed relative to the masking process within a pathway. Interaction between pathways may function to improve temporal resolution by suppressing persistence of neural response in the complementary pathway. The present pattern polarity and temporal asynchrony effects on the contrast discrimination function also decisively falsify the “uncertainty” hypothesis for low-contrast threshold facilitation (the dipper)." @default.
• W2001581877 created "2016-06-24" @default.
• W2001581877 creator A5019665276 @default.
• W2001581877 date "1997-01-01" @default.
• W2001581877 modified "2023-10-18" @default.
• W2001581877 title "Isolation and interaction of ON and OFF pathways in human vision: Contrast discrimination at pattern offset" @default.
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• W2001581877 doi "https://doi.org/10.1016/s0042-6989(96)00110-1" @default.
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