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Related Experiment Videos

Temporary threshold shift measured with two psychophysical procedures.

H S Plattsmier1, D McFadden

  • 1Department of Psychology, University of Texas, Austin.

Audiology : Official Organ of the International Society of Audiology
|January 1, 1988
PubMed
Summary
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This study investigated temporary threshold shift (TTS) using different psychophysical methods. Results indicate that response criteria do not significantly impact TTS estimates or variability in trained observers.

Area of Science:

  • Audiology
  • Psychophysics
  • Hearing Science

Background:

  • Temporary threshold shift (TTS) research often uses criterion-dependent methods, potentially confounding sensitivity measures.
  • High variability in TTS estimates is a common issue, possibly due to fluctuating response criteria.

Purpose of the Study:

  • To determine if response criteria influence TTS magnitude and variability.
  • To compare a criterion-dependent method with a criterion-free method for TTS assessment.

Main Methods:

  • Compared a method of adjustment (criterion-dependent) with a two-interval forced-choice (criterion-free) procedure.
  • Obtained postexposure sensitivity estimates using both methods within sessions.
  • Assessed pre- and postexposure baseline measures and session-to-session variability.

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Main Results:

  • Postexposure sensitivity estimates differed statistically between methods, but preexposure baselines were similar.
  • Temporary threshold shift (TTS) values were equivalent across both psychophysical procedures.
  • Session-to-session variability was not significantly different between the two methods.

Conclusions:

  • Response criteria fluctuations do not appear to contaminate TTS estimates in trained observers.
  • Both criterion-dependent and criterion-free methods yielded comparable TTS magnitudes and variability.
  • The choice between these methods for TTS assessment in trained observers is not critical regarding variability.