Abstract
Perceptual latency to a foveal stimulus was determined with the perceived-order method. In Experiment 1, luminance ranged from 29 to 114,000 td, stimulus durations ranged from 2 to 2,500 msec, and all stimuli were 100% detectable. One observer showed no significant duration effect, and the other showed a significant, but irregular, effect. In Experiment 2, absolute threshold was determined at the same durations, and perceptual latencies were subsequently determined with luminance.1 log above absolute threshold (100% detectable). Latencies increased at long durations for both observers. This result can probably best be explained in terms of probability summation.
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