Influence of Direct-Current Polarization of the Cochlear Partition on the Summating Potentials

John D. Durrant, Peter Dallos

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

The effects of electrically biasing the cochlear partition on the summating potentials were investigated in guinea pigs. The DIF (DIF = SV − ST) and AVE (2 AVE = SV + ST) SP responses were observed under polarization as well as the cochlear microphonics. These responses were recorded and the cochlear partition was polarized in the first and third turns; a wide range of stimulus parameters was utilized. The negative DIF and positive AVE components exhibited similar qualitative effects of electrical biasing as the (pure tone) CM, but the amount of change induced in the former responses was typically three or more times greater than that seen in the CM. While the DIF+ exhibited the opposite effects of polarization, compared to these responses, the results revealed an underlying relationship between the positive and negative DIF responses. As a rule, positive polarization currents caused the DIF responses to become less positive and more negative while the opposite was true for negative currents. No systematic level-dependent effects of electrical biasing were observed in the behavior of the negative DIF or positive AVE or in the positive DIF, given the complexities of its input-output function (without polarization). The results pertaining to the negative AVE component provided little basis for concrete conclusions concerning the effects of polarization on this component. The findings of this investigation reflect the involvement of electromechanical nonlinearities in the generation of the summating potentials.

Original languageEnglish (US)
Pages (from-to)542-552
Number of pages11
JournalJournal of the Acoustical Society of America
Volume52
Issue number2B
DOIs
StatePublished - Jan 1 1972

ASJC Scopus subject areas

  • Acoustics and Ultrasonics
  • Arts and Humanities (miscellaneous)

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