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Transition bandwidths for stimuli with sparse spectral densities (L).

Matthew D Turner1, Bruce G Berg1

  • 1Department of Cognitive Sciences, University of California Irvine, Irvine, California 92697-5100, USA.

The Journal of the Acoustical Society of America
|March 2, 2020
PubMed
Summary

Individual differences in transition bandwidths are substantial. This bandwidth shifts from temporal to spectral processing when stimuli allow across-channel comparisons, even with large frequency differences.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Signal processing

Background:

  • Transition bandwidths are key metrics in psychoacoustic experiments, revealing how listeners discriminate auditory stimuli.
  • These bandwidths show significant individual variability and are linked to changes in auditory processing strategies.

Purpose of the Study:

  • To investigate the characteristics of transition bandwidths in auditory discrimination.
  • To determine the relationship between transition bandwidths and spectral/temporal processing.
  • To explore the influence of stimulus properties on the transition from temporal to spectral analysis.

Main Methods:

  • Utilizing band-widening discrimination experiments to measure transition bandwidths.
  • Analyzing threshold functions to identify peaks corresponding to transition bandwidths.
  • Varying spectral density and frequency differences to assess their impact on transition bandwidths.

Main Results:

  • Observed a tenfold range in individual differences for transition bandwidths.
  • Found that transition bandwidths are unaffected by spectral density, tolerating frequency differences up to 400 Hz.
  • Demonstrated an automatic shift from temporal to spectral processing (profile analysis) when stimuli enable across-channel comparisons.

Conclusions:

  • Transition bandwidths are robust to spectral variations, suggesting early peripheral filtering distinguishes spectral and temporal cues.
  • The findings support models where spectral and temporal auditory processing are separated early in the auditory system.
  • Auditory processing strategies adapt based on stimulus complexity, transitioning to across-channel analysis for widerband signals.