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Psychometric functions for level discrimination.

S Buus1, M Florentine

  • 1Department of Electrical and Computer Engineering, Northeastern University, Boston, Massachusetts 02115.

The Journal of the Acoustical Society of America
|September 1, 1991
PubMed
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This study reveals that auditory sensitivity (d-prime) is nearly proportional to changes in sound pressure level (delta L) across various conditions. This finding supports multichannel models of intensity discrimination and validates the use of difference limens on a logarithmic scale.

Area of Science:

  • Auditory Perception
  • Psychoacoustics
  • Signal Detection Theory

Background:

  • Intensity discrimination is crucial for understanding auditory processing.
  • Psychometric functions characterize performance in psychophysical tasks.
  • Previous models suggest varying relationships between sensitivity and stimulus intensity.

Purpose of the Study:

  • To determine the form of psychometric functions for intensity discrimination.
  • To investigate the relationship between sensitivity (d') and sound pressure level changes (delta L).
  • To evaluate the validity of difference limens (delta LDL) in representing performance.

Main Methods:

  • Ten increment levels of auditory stimuli were presented to five normal listeners.
  • Stimuli included tones of varying frequencies and durations, and broadband noise.

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  • Data were collected over 100 trials per block, with at least 20 blocks per condition in mixed order.

    • Main Results:

    • Sensitivity (d') showed a near-proportional relationship with delta L across tested difference limens.
    • When plotting d' against Weber fractions (delta p/p or delta I/I), power function exponents decreased with increasing difference limens.
    • Exponents were less than unity for larger difference limens.

    Conclusions:

    • The observed proportionality between d' and delta L aligns with multichannel models of auditory level discrimination.
    • Results support the use of difference limens (delta LDL) on a logarithmic scale as a valid measure of performance.
    • The findings are consistent with psychometric functions from single auditory-nerve fibers.