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Related Experiment Videos

Place code for pitch: a necessary revision.

J J Zwislocki1, M Nguyen

  • 1Institute for Sensory Research, Syracuse University, NY 13244-5290, USA. joe_zwislocki@isr.syr.edu

Acta Oto-Laryngologica
|May 13, 1999
PubMed
Summary
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The location of maximum cochlear excitation shifts with sound intensity, challenging its role as a pitch code. Instead, the invariant apical excitation cut-off may represent the place code for pitch.

Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Bioacoustics

Background:

  • The tonotopic map, based on cochlear excitation maximum, is traditionally considered the primary code for subjective pitch.
  • This map, described by Békésy, shows movement from cochlear apex to base with increasing frequency.
  • Pitch perception is largely independent of sound intensity, implying the excitation maximum's location should also be intensity-invariant.

Purpose of the Study:

  • To directly verify indirect evidence suggesting the cochlear excitation maximum's location varies with sound intensity.
  • To investigate the role of cochlear place codes in pitch perception, considering intensity-independent mechanisms.
  • To explore the implications of these findings for auditory mechanisms and cochlear implant technology.

Main Methods:

Related Experiment Videos

  • Recording Hensen's cell potentials at multiple cochlear turn locations in Mongolian gerbils.
  • Measuring the shift in the maximum response location in response to single tones at varying sound intensities.
  • Analyzing the intensity-dependence of the apical excitation cut-off frequency.

Main Results:

  • Direct measurements confirmed that the cochlear excitation maximum shifts significantly towards the cochlear base as sound intensity increases.
  • An intensity increase of 10 dB caused a shift of approximately 0.225 mm in the excitation maximum.
  • The apical excitation cut-off frequency, however, remained invariant across different sound intensities at each cochlear location.

Conclusions:

  • The intensity-dependent movement of the cochlear excitation maximum makes it an inadequate code for pitch.
  • The invariant apical excitation cut-off frequency presents a plausible alternative place code for pitch perception.
  • These discoveries necessitate a re-evaluation of auditory processing models and cochlear implant design.