Shifts in the threshold of hearing were determined as a function of prolonged testing (12 sessions) with four experimental groups: forced-choice-feedback, no-forced-choice-feedback, forced-choice-no-feedback, and no-forced-choice-no-feedback. The forced-choice technique was found to improve performance if used with immediate knowledge of results (feedback). Otherwise, thresholds obtained under a forced-choice procedure were poorer than those obtained under no-forced-choice instructions. Even after 12 sessions, increasing the subjects' motivation by offers of monetary rewards resulted in a further decrease in threshold.
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Lukaszewski et al. (1962) studied this question.
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