Low‐frequency neural and cochlear‐microphonic tuning curves in the gerbil
作者:
R. A. Schmiedt,
J. J. Zwislicki,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1978)
卷期:
Volume 64,
issue 2
页码: 502-507
ISSN:0001-4966
年代: 1978
DOI:10.1121/1.382000
出版商: Acoustical Society of America
数据来源: AIP
摘要:
Average tuning curves of single auditory‐nerve fibers are compared with average cochlear‐microphonic (CM) tuning curves corrected for electrical filtering of the cochlea. Both the neural and CM data were obtained from Mongolian gerbils (Merionesunguiculatus) with the same acoustic system and similar corrections for middle‐ear effects. Under these conditions the CM tuning in the second and third cochlear turns in similar to the tuning of fibers whose characteristic frequencies (CFs) correspond to the CM best frequencies (2.5 and 0.5 kHz). Thus, little sharpening seems to take place for low CF fibers. CM tuning at the most apical electrode position is sharper than expected for frequencies below the best frequency—a result that may be due to the shunting effect of the helicotrema at low frequencies. Previous modeling results have confirmed that apical basilar‐membrane tuning may be appreciably affected by the mechanical impedance of the helicotrema. This helicotrema effect may account for the nearly symmetrical shapes of neural tuning curves of low‐CF fibers.
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