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Stimulus selection in adaptive psychophysical procedures.

D M Green1

  • 1Psychology Department, University of Florida, Gainesville 32611.

The Journal of the Acoustical Society of America
|June 1, 1990
PubMed
Summary
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Adaptive psychophysical procedures are more efficient when stimuli are presented at higher levels, yielding 84-94% correct responses. The common two-down one-up rule, targeting 70.7% correct, is less efficient for threshold estimation.

Area of Science:

  • Psychophysics
  • Auditory perception
  • Signal detection theory

Background:

  • Adaptive psychophysical procedures are widely used to estimate sensory thresholds.
  • The choice of stimulus level in these procedures impacts estimation efficiency.
  • The two-down one-up rule is a popular but potentially suboptimal tracking method.

Purpose of the Study:

  • To determine the optimal stimulus level for efficient threshold estimation in adaptive psychophysical tasks.
  • To compare the efficiency of different stimulus placement strategies, particularly the two-down one-up rule.

Main Methods:

  • Computer simulations of various psychometric functions.
  • Analysis of stimulus placement at different percentage correct levels (e.g., 70.7% vs. 94%).

Related Experiment Videos

  • Data collection from human listeners performing psychophysical tasks.

    • Main Results:

    • Optimal stimulus levels for high efficiency correspond to 84-94% correct responses in a two-alternative forced-choice task.
    • The two-down one-up rule, targeting 70.7% correct, results in lower estimation efficiency.
    • The precise shape of the psychometric function is not critical for achieving high efficiency.

    Conclusions:

    • Adaptive procedures should present stimuli at higher levels (84-94% correct) for optimal threshold estimation.
    • The standard two-down one-up rule is less efficient than strategies targeting higher correct response rates.
    • Human listener data confirm that threshold estimates have larger variability when using less efficient stimulus levels.