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Temporal asymmetry in the auditory system

T Irino1, R D Patterson

  • 1NTT Basic Research Laboratories, Kanagawa, Japan. irino@nttlab.brl.ntt.jp

The Journal of the Acoustical Society of America
|April 1, 1996
PubMed
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Auditory perception shows temporal asymmetry. Reversed "ramped" sounds restore perceived carrier quality better than "damped" sounds, revealing this asymmetry in hearing.

Area of Science:

  • Psychoacoustics
  • Auditory Perception
  • Signal Processing

Background:

  • Damped exponentials modulate sound, suppressing carrier quality.
  • Ramped sounds, time-reversed damped sounds, restore perceived carrier quality.
  • This contrast reveals temporal asymmetry in auditory perception.

Purpose of the Study:

  • Quantify the temporal asymmetry in auditory perception.
  • Investigate the perceptual contrast between damped and ramped sounds.
  • Compare auditory models' ability to explain this asymmetry.

Main Methods:

  • Experimentally presented ramped and damped sounds (sinusoidal and noise carriers).
  • Measured the damped half-life needed to match the perceived strength of ramped sounds.
  • Utilized multichannel auditory models (gammatone filterbank) and a novel delta-gamma theory.

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Main Results:

  • Sinusoidal carriers required a damped half-life ~5x longer than ramped sounds for equivalent perception.
  • Noise carriers showed about half the asymmetry of sinusoidal carriers.
  • Traditional auditory models failed to explain the observed temporal asymmetry.

Conclusions:

  • Auditory perception exhibits significant temporal asymmetry, favoring ramped over damped sound envelopes.
  • A new delta-gamma theory provides a framework for understanding this perceptual asymmetry.
  • Existing auditory models need refinement to account for temporal asymmetry in hearing.