A mechanoelectrical mechanism for detection of sound envelopes in the hearing organ

Alfred L. Nuttall, Anthony J. Ricci, George Burwood, James M. Harte, Stefan Stenfelt, Per Cayé-Thomasen, Tianying Ren, Sripriya Ramamoorthy, Yuan Zhang, Teresa Wilson, Thomas Lunner, Brian C.J. Moore, Anders Fridberger

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


To understand speech, the slowly varying outline, or envelope, of the acoustic stimulus is used to distinguish words. A small amount of information about the envelope is sufficient for speech recognition, but the mechanism used by the auditory system to extract the envelope is not known. Several different theories have been proposed, including envelope detection by auditory nerve dendrites as well as various mechanisms involving the sensory hair cells. We used recordings from human and animal inner ears to show that the dominant mechanism for envelope detection is distortion introduced by mechanoelectrical transduction channels. This electrical distortion, which is not apparent in the sound-evoked vibrations of the basilar membrane, tracks the envelope, excites the auditory nerve, and transmits information about the shape of the envelope to the brain.

Original languageEnglish (US)
Article number4175
JournalNature communications
Issue number1
StatePublished - Dec 1 2018

ASJC Scopus subject areas

  • General Chemistry
  • General
  • General Biochemistry, Genetics and Molecular Biology
  • General Physics and Astronomy


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