Such a procedure combines the experimenter's prior knowledge (tGuess = −1, tGuessSd = 5.0, beta = 3.5, delta = 0.01, gamma = 0.5 in QUEST software of Psychophysics Toolbox [36]) and the observer's responses (i.e., right or left) in past trials in choosing the signal strength for the next trial, and, in the end, estimating threshold.
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