Electrophysiological study of the maturation of auditory responses from the inner ear of the chick

Brain Res. 1981 Dec 14;229(1):15-23. doi: 10.1016/0006-8993(81)90741-1.


Three electrophysiological functions of the chick basilar papilla were studied during development by recording the compound actin potential (AP) at the round window. The auditory thresholds showed a continuous maturation between the fifteenth day of incubation (E15) and the first post-hatching day (P1), when they attained adult values. Responses matured first to low frequencies and later to high frequency stimuli. The input-output (intensity-amplitude) functions matured regularly and never demonstrated the classical two slopes seen in mammals. The tuning properties, studied by tone-on-tone masking of the AP, achieved mature values before the thresholds; the Q10s reached adult values at E17 for a 500-Hz probe tone and at E19 for a 1000-Hz probe tone. The fact that a low-to-high frequency development trend was found with the embryonic middle ear cleared of fluids further suggests that this property of auditory ontogeny may be a function of changes in the transduction properties of the cochlea.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Aging*
  • Animals
  • Auditory Perception / physiology*
  • Auditory Threshold / physiology
  • Chick Embryo
  • Chickens
  • Cochlea / innervation*
  • Cochlear Microphonic Potentials
  • Cochlear Nerve / physiology*
  • Pitch Perception / physiology
  • Round Window, Ear / innervation*