Basilar membrane vibration in the basal turn of the sensitive gerbil cochlea

  • Ren T
  • Nuttall A
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Abstract

The basal membrane (BM) velocity responses to pure tones were measured using a newly developed laser interferometer microscope that does not require placing a reflecting object on the BM. It was demonstrated that the instrument is able to measure sub-nanometer vibration from the cochlear partition in the basal turn of the gerbil. The overall shape of the amplitude spectra shows typical tuning features. The 'best' frequencies (BFs) for the BM locations studied were between 14 kHz and 27 kHz, depending on the longitudinal position. For a given BM location, tuning sharpness was input level dependent, indicated by the Q(10dB), which varied from approximately 3 at low stimulus levels to near 1.5 at high input levels. At frequencies below BF, parallel amplitude/frequency curves across stimulus levels indicate a linear growth function. However, at frequencies near BF, the velocity increased linearly at low levels (

Author-supplied keywords

  • Basilar membrane
  • Cochlea
  • Gerbil
  • Laser interferometer
  • Vibration

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Authors

  • Tianying Ren

  • Alfred L. Nuttall

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