期刊
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
卷 107, 期 5, 页码 2615-2630出版社
ACOUSTICAL SOC AMER AMER INST PHYSICS
DOI: 10.1121/1.428648
关键词
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资金
- NIDCD NIH HHS [5 RO1 DC 00235, T32 DC00038] Funding Source: Medline
There has been no systematic study of auditory-nerve-fiber (ANF) responses to high-level clicks despite the advantages of clicks in revealing the natural resonances of a system. Cat single ANFs were studied using clicks up to 120 dB pSPL. Peri-stimulus-time (PST) histograms of responses were corrected for refractory effects, and compound PST (cPST) histograms were formed from rarefaction- and condensation-click PSTs. At low levels the responses followed the classic picture with each cPST appearing to be from a single resonant system followed by low-pass filtering that reduces high-frequency synchrony. In fibers across all characteristic frequencies, there were significantly different patterns at high click levels including several nonclassic features and phase reversals, i.e., a peak in the rarefaction-click PST at low levels was replaced at high levels by a peak at the same latency in the condensation-click PST. There were two separate regions of nonclassic features and phase reversals, which indicates that auditory-nerve fibers are excited by the combination at some stage in the cochlea of at least three excitation drives derived from the acoustic stimulus. These data support the interpretation that the cochlear partition vibrates in multiple resonant modes with each mode producing one excitation drive and that the mix of modes varies with sound level. (C) 2000 Acoustical Society of America. [S0001-4966(00)00205-8].
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