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Purpose: Perceptual sensitivity is usually estimated over some test-time intervals, which results in imprecise and biased estimates when it changes over time. A novel procedure, the quick Change Detection (qCD) method, is developed to accurately, precisely, and efficiently quantify the full time course of perceptual sensitivity change, and demonstrated in dark adaptation.

Methods: Based on Bayesian adaptive testing (Lesmes, et al, 2010), the qCD method selects the optimal stimulus, and updates, trial by trial, a joint probability distribution of the parameters that quantify both perceptual sensitivity and its change over time. In a dark adaptation experiment, the time course of visual sensitivity change was measured with qCD and quick Forced-Choice (qFC, Lesmes, et al, 2014) in separate sessions. Each session started with a 120-second exposure to high luminance (150 cd/m 2) and followed by measurement of visual …