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Journal of Vision
This study investigated two aspects of visual sensitivity to a change in light level. The first experiment examined the time course of sensitivity to a small amplitude 1-s contrast pedestal presented on a 163-td pedestal within a 115-td surround. The largest contrast pedestal was an 8% contrast change that changed the steady pedestal threshold by only 0.03 log unit. Thresholds increased by 0.6 log unit or more at both onset and offset, with a return to baseline within 100 ms. The increment anddoi:10.1167/3.6.3 pmid:12901713 fatcat:nhbe4n7qcnfbfixz7z7funxbj4