Abstract
Forced-choice adaptive procedures enjoy widespread use for the measurement of detection and discrimination thresholds. Zwislocki et al. [J. Acoust. Soc. Am. 30, 254–262 (1958)] proposed an adaptive procedure with a decision rule that targets 75% correct several years before these procedures gained acceptance in psychophysics, and even today little is known about the statistical properties of this decision rule. This paper evaluates, using computer simulations, the bias and efficiency of Zwislocki’s proposed decision rule in 2-alternative forced-choice (AFC) and 3-AFC procedures under conditions of full attention and inattenion. The results for this decision rule compare favorably with two popular rules proposed by Levitt [J. Acoust. Soc. Am. 49, 467–477 (1971)] that target 70.7% correct and 79.4% correct. In summary, the rule that targets 75% correct (Zwislocki’s rule) produces less biased threshold estimates than the rule that targets 70.7% correct and it is affected less by inattention than the rule that targets 79.4% correct. This research supports the addition of Zwislocki’s rule to the psychophysical toolbox.
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