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A comparison of psychophysical procedures for level-discrimination thresholds
Peter Marvit1, Mary Florentine, Søren Buus
1Institute for Hearing, Speech, & Language, Department of Speech-Language Pathology & Audiology (106-A FR), Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 02115, USA. peter@marvit.org
The Journal of the Acoustical Society of America
|June 26, 2003
Summary
Five psychophysical methods for measuring sound intensity discrimination thresholds yielded similar results. The classic transformed up-down staircase method (UPD) showed the lowest variance in threshold estimates, highlighting the importance of empirical verification for procedure effectiveness.
Area of Science:
- Auditory Psychophysics
- Psychoacoustics
- Sensory Perception
Background:
- Accurate measurement of auditory perception is crucial for understanding hearing.
- Level-discrimination, or intensity discrimination, is a fundamental aspect of auditory perception.
- Various psychophysical procedures exist, each with potential strengths and weaknesses.
Purpose of the Study:
- To compare the effectiveness of five different psychophysical procedures for measuring sound intensity discrimination thresholds.
- To evaluate threshold estimates, variance, and efficiency across procedures.
- To investigate the impact of listener behavior and parameter choices on procedure performance.
Main Methods:
- Five psychophysical procedures were employed: transformed up-down staircase with 2AFC (UPD), Method of Maximum Likelihood (MML) with cued yes-no (15 and 50 trials), and ZEST (18 trials) with cued yes-no and 2AFC.
- Thresholds for 1-kHz tones were measured at two intensity levels (30 and 90 dB SPL) and two durations (10 and 500 ms).
- Nine normal-hearing listeners participated in the study.
Main Results:
- All five procedures produced similar level-discrimination threshold estimates when accounting for convergence points.
- The transformed up-down staircase method (UPD) exhibited the smallest variance in threshold estimates.
- Simulations indicated that ideal procedure performance may differ significantly from real-world application.
Conclusions:
- The choice of psychophysical procedure can impact the reliability and efficiency of auditory threshold measurements.
- The classic transformed up-down staircase method (UPD) appears robust for measuring intensity discrimination.
- Empirical verification is essential to validate the effectiveness of psychophysical procedures in practice.