in his work Elements of Psychophysics. Three methods are traditionally used for testing a subject's perception of a stimulus: the method of limits, the method of constant stimuli, and the method of adjustment.

thumb; Method of limits: In the method of limits, the tester controls the level of the stimuli. Single-interval yes/no paradigm' is used, but there are no catch trials.

: The trial uses several series of descending and ascending runs.

: The trial starts

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