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Illusory percepts from auditory adaptation.

Lucas C Parra1, Barak A Pearlmutter

  • 1Biomedical Engineering Department, City College of New York, New York, NY 10031, USA. parra@ccny.cuny.edu

The Journal of the Acoustical Society of America
|April 6, 2007
PubMed
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Tinnitus and Zwicker tone share an auditory gain adaptation mechanism. Tinnitus patients are more likely to perceive the Zwicker tone, suggesting a link between phantom sounds and hearing loss adaptation.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Signal Processing

Background:

  • Tinnitus and Zwicker phantom tone phenomena are linked to auditory gain adaptation.
  • This mechanism attempts to optimize a fixed-capacity auditory channel.
  • Hearing loss can lead to enhanced internal noise, causing phantom sound perception.

Purpose of the Study:

  • To investigate the relationship between tinnitus and the Zwicker tone percept.
  • To test the hypothesis that phantom percepts arise from central adaptation mechanisms in response to degraded auditory input.

Main Methods:

  • A computational model was developed to predict auditory responses.
  • Listening experiments were conducted on 44 human subjects.
  • Subjects' perception of the Zwicker tone was assessed, differentiating between normal and tinnitus groups.

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Main Results:

  • The model predicted different outcomes for normal and tinnitus subjects due to altered nonlinear compression.
  • Psychoacoustic experiments revealed that 11 out of 44 tinnitus subjects were significantly more likely to perceive the Zwicker tone.
  • This provides the first empirical evidence linking Zwicker tone perception and tinnitus.

Conclusions:

  • The study supports the hypothesis that phantom auditory percepts, like tinnitus and Zwicker tone, result from central adaptation mechanisms.
  • A degraded auditory system, common in hearing loss and tinnitus, influences these adaptive processes.
  • The findings establish a concrete link between the Zwicker tone and tinnitus, advancing our understanding of auditory perception.