Two-down one-up adaptive procedures estimate the 70 percent correct point

Evidence

Masker threshold for a fixed signal level was measured using a three-interval forced-choice adaptive procedure. Participants were instructed to use a computer mouse or keyboard to choose the interval that sounded different from the others. The masker level was increased following one incorrect response and decreased following two correct responses. Following this procedure, an estimate of 70 % correct on the psychometric function is obtained (Levitt 1971 ). — Dijk, Pim van, Physiology, Psychoacoustics and…, 927