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Orientation sensitivity depends on the cortical convergence of on- and off-center subcortical neurons. Off-center inputs are faster and stronger than their on-center counterparts: How does this asymmetry affect orientation discrimination? We tackled this question psychophysically with grating stimuli that either increased or decreased luminance. The… (More)
AIMS 1. The visual contrast-response function in human subjects typically has low gradient at low contrast. This is inconsistent with signal detection theory, and we therefore aimed to measure precisely the contrast-response function at low contrast. 2. Recently published work shows that light decrements are detected sooner than increments. We aimed to see… (More)