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Adaptive auditory brightness perception.

Kai Siedenburg1, Feline Malin Barg2, Henning Schepker2,3

  • 1Department of Medical Physics and Acoustics, Carl von Ossietzky University of Oldenburg, Oldenburg, Germany. kai.siedenburg@uol.de.

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Auditory brightness perception adapts to prior sound exposure, showing contrastive effects in real-world listening scenarios. This adaptation occurs rapidly, within short-term memory timescales.

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Area of Science:

  • Auditory Perception
  • Psychoacoustics
  • Sensory Adaptation

Background:

  • Perception adjusts to prior stimulation, seen in vision (color constancy) and speech.
  • Auditory brightness adaptation mechanisms are less understood.
  • Investigating adaptation to spectral coloration in naturalistic sounds is crucial.

Purpose of the Study:

  • To test if listeners adapt their auditory brightness judgments to spectral colorations.
  • To examine the time course and characteristics of auditory brightness adaptation.
  • To compare adaptation effects from different spectral filtering methods.

Main Methods:

  • Listeners judged auditory brightness after exposure to music and speech excerpts with spectral filtering.
  • Adaptation was measured on a trial-by-trial basis.
  • A simple model of response criterion was used to analyze data.

Main Results:

  • Consistent contrastive adaptation of auditory brightness judgments was observed.
  • Adaptation effects increased with adaptor duration, leveling off around 8 trials (2s each).
  • Adaptation effects were similar for linear spectral filters and hearing device transfer functions.

Conclusions:

  • Auditory brightness perception demonstrates significant adaptivity under realistic acoustic conditions.
  • Adaptation occurs on timescales consistent with auditory short-term memory.
  • Findings support the dynamic nature of auditory perception and have implications for hearing device design.