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Two-tone suppression in cochlear mechanics

N P Cooper1

  • 1Department of Neurophysiology, University of Wisconsin-Madison 53706, USA. cooper@neurophys.wisc.edu

The Journal of the Acoustical Society of America
|May 1, 1996
PubMed
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Two-tone suppression on the guinea pig basilar membrane (BM) shows distinct patterns. Below-best frequency (BF) tones cause stronger suppression and larger BM displacements than above-BF tones.

Area of Science:

  • Auditory Neuroscience
  • Bioacoustics
  • Cochlear Mechanics

Background:

  • The basilar membrane (BM) is crucial for frequency selectivity in hearing.
  • Understanding mechanical responses to auditory stimuli is key to deciphering cochlear function.

Purpose of the Study:

  • To investigate two-tone suppression (2TS) on the guinea pig basilar membrane (BM).
  • To characterize the mechanical responses to suppressor tones presented above and below the best frequency (BF).

Main Methods:

  • Recorded BM mechanical responses in the guinea pig cochlea using one- and two-tone stimuli.
  • Focused on cochlear regions with best frequencies (BFs) around 25-30 kHz.
  • Analyzed the effects of suppressor tones on probe tone responses near BF.

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Main Results:

  • Two-tone suppression (2TS) was observed with suppressor tones both above and below the BF.
  • Below-BF suppressor tones induced stronger 2TS with higher growth rates (approx. 1 dB/dB) and larger BM displacements (1-5 nm) compared to above-BF tones.
  • Both suppressor types altered probe tone response phase, mimicking effects of increased probe intensity.
  • Low-frequency suppressors (<7 kHz) caused frequency- and intensity-dependent phasic (ac) and tonic (dc) suppression, peaking at BM displacement, not velocity.

Conclusions:

  • The mechanical basis of two-tone suppression differs for tones above and below the best frequency.
  • BM displacement, rather than velocity, is critical for the observed suppression effects.
  • Findings provide insights into the non-linear processing within the cochlea.