Archives of oto-rhino-laryngology

, Volume 238, Issue 1, pp 17–26 | Cite as

Remotely recorded cochlear microphonic in the cat

  • E. Laukli
  • I. W. S. Mair
Article

Summary

The cochlear microphonic (CM) was recorded differentially with subcutaneous electrodes at the vertex and a variety of positions on the head and neck of the cat, and the phase and amplitude were compared with simultaneous recordings from vertex and contralateral ear electrodes. Recordings were made in bilaterally hearing animals, both with and without ear canal occlusion, following unilateral labyrinthectomy, and in white-coat cats with hereditary unilateral deafness, and in different age-groups. The cochlear microphonic was in phase with the contralateral recording at all electrode sites except those in the immediate vicinity of the stimulus ear. The amplitude was less at the circumaural positions and greater at cervical locations. The results were consistent in all age-groups and in bilaterally and unilaterally hearing animals. Precise electrode placement in the near-field conditions around the stimulus ear is therefore critical, especially for phase, while far-field conditions would appear to predominate at the remaining electrode sites.

Key words

Cochlear microphonic Phase Amplitude Cat 

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Copyright information

© Springer-Verlag 1983

Authors and Affiliations

  • E. Laukli
    • 1
    • 2
  • I. W. S. Mair
    • 1
    • 2
  1. 1.Department of OtorhinolaryngologyRegionsykehuset i TromsoNorway
  2. 2.Institute of Clinical MedicineUniversity of TromsøTromsøNorway

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