Sound‐induced resistance changes in the inner ear
作者:
C. Daniel Geisler,
David C. Mountain,
Allyn E. Hubbard,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1980)
卷期:
Volume 67,
issue 5
页码: 1729-1735
ISSN:0001-4966
年代: 1980
DOI:10.1121/1.384299
出版商: Acoustical Society of America
数据来源: AIP
摘要:
A new technique for measuring sound‐induced resistance changes (CR) in scala media in response to pure‐tone stimuli by injecting alternating current into guinea‐pig cochleas was reported recently [C. D. Geisleretal., J. Acoust. Soc. Am. 61, 1557–1566 (1977)]. Detailed measurements with this technique indicate that while the CR behaves approximately as does the cochlear microphonic (CM) there can be very significant differences between the two variables under certain experimental conditions. Computer analysis of simultaneously recorded CR voltage components and CM indicates that the CR harmonics, in both amplitude and phase, behaved differently with sound intensity and with asphyxia than did the CM harmonics (A. E. Hubbardetal., J. Acoust. Soc. Am 66, 431–445 (1979)]. Direct current injection and stimulation of the crossed olivocochlear bundle (COCB) indicate further differences between CM and CR (D. C. Mountain, Ph.D. thesis, University of Wisconsin—Madison, 1978). Positive dc caused a relative augmentation of CM that grew with sound intensity, and a relative reduction in CR magnitude that decreased with intensity. Negative dc caused effects of similar magnitude but opposite sign. COCB stimulation caused enhancement of both CM and CR. Present models cannot account quantitatively for these results.
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