The Effect Of Iuminance On Contrast Detection In Binocular Vision Against Different Levels Of External Noise And Its Perceptual Template Model Analyzing

Luminance has been found to play a modulating role in the processes of many visual tasks, which turns out to be a fine mediate to study visual processing. However the mechanism of how luminance plays its modulation role has been poorly studied and the conclusion can be controversial. Here, using a dichoptic viewing paradigm, we studied the effect of changing unilateral mean luminance on the detectability of sine wave gratings at frequencies of1and2cycles per degree (c/d) against backgrounds of various levels of white noise in normal subjects. We found that unilateral luminance altered additive internal noise within a PTM framework. Low luminance increased additive internal noise while high luminance reduced additive internal noise. This finding may help to reveal how luminance modulate contrast detection and its relative mechanisms.This study aims at revealing the function of luminance on visual processing by testing contrast detection thresholds against different levels of external noise in one eye while altering the mean luminance level in the other eye. By measuring the difference of monocular and dichoptical conditions at3luminance levels we could see how luminance affects contrast detection. Based on the PTM model, we propose an underlying mechanism of how luminance affects binocular integration.