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The measurement problem in level discrimination.

Daniel Shepherd1, Michael J Hautus

  • 1The University of Auckland, New Zealand. daniel.shepherd@aut.ac.nz

The Journal of the Acoustical Society of America
|May 3, 2007
PubMed
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Researchers investigated measures for auditory level discrimination. The study found that the ratio of pressure difference to pressure (deltap/p) is most linearly related to the sensitivity index (d'), suggesting it as the preferred measure.

Area of Science:

  • Auditory Perception
  • Psychoacoustics
  • Signal Detection Theory

Background:

  • Disagreement exists regarding the optimal measure for quantifying auditory level discrimination.
  • The sensitivity index (d') is a key metric, and measures linearly related to it are preferred.
  • Candidate measures include level difference (deltaL) and Weber fraction (theta), with theta having unit-dependent variations.

Purpose of the Study:

  • To determine which measure of auditory level discrimination is most linearly related to the sensitivity index (d').
  • To compare deltaL, Weber fraction based on pressure (deltap/p), and Weber fraction based on intensity (deltaI/I).

Main Methods:

  • Psychometric functions for auditory level discrimination were measured.
  • Stimuli included 10-ms sinusoids (1000 and 6500 Hz) and broadband noise bursts.

Related Experiment Videos

  • Data were analyzed to assess the linearity between d' and the candidate measures (deltaL, deltap/p, deltaI/I).

    • Main Results:

    • The measure deltap/p demonstrated the closest linear relationship with the sensitivity index (d').
    • Both deltaL and deltaI/I showed less linear relationships compared to deltap/p.
    • The findings were consistent across different sound stimuli and pedestal levels.

    Conclusions:

    • The ratio of pressure difference to pressure (deltap/p) is proposed as the most appropriate measure for auditory level discrimination.
    • This measure offers a more consistent and linearly related correlate to perceptual sensitivity (d') than other tested metrics.
    • The findings contribute to a standardized approach in psychoacoustic research for level discrimination tasks.