Rapid assessment of sound-evoked olivocochlear feedback: suppression of compound action potentials by contralateral sound.
The compound action potential (CAP) measured at the round window of anesthetized cats in response to low-level tone pips can be significantly suppressed by addition of tones or noise to the opposite ear. This contralateral-sound suppression disappears upon transection of the olivocochlear bundle. The frequency and level dependence of the suppression phenomenon are well explained by known sound-evoked discharge properties of single olivocochlear neurons. Thus, the contralateral-sound suppression of cochlear CAP should prove useful as a rapid measure of the magnitude of the sound-evoked efferent feedback to the cochlea.
Liberman
M C
MC
Department of Otolaryngology, Harvard Medical School, Boston, Massachusetts.
D000818:Animals; D001288:Attention / Q000502:physiology*; D001309:Auditory Threshold / Q000502:physiology; D002415:Cats; D003056:Cochlear Nerve / Q000502:physiology*; D004292:Dominance, Cerebral / Q000502:physiology*; D004525:Efferent Pathways / Q000502:physiology; D005072:Evoked Potentials, Auditory; D006198:Hair Cells, Auditory / Q000502:physiology*; D009847:Olivary Nucleus / Q000502:physiology*; D010898:Pitch Perception / Q000502:physiology*