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KMID : 0361019960390071214
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Korean Journal of Otolaryngology - Head and Neck Surgery
1996 Volume.39 No. 7 p.1214 ~ p.1219
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Frequency Selectivity of Low BEF Auditory Nerve Fibers in the Amphibian Papilla
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Abstract
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The tonal frequency selectivity of auditory nerve fibers from the amphibian papilla was studied in the green treefrog(Hyla cinerea) in order to characterize the response variation across the excitatory threshold tuning curve. Excitatory threshold
tuning
curves and iso-intensity rate spectra did not delineate the same frequency selectivity. The most selective frequency was shifted systematically, depending on the sound intensity level. All auditory units from the amphibian papilla showed
single-peaked
profiles and frequency-dependent saturation under the intensity variation. Since these units exhibited pronounced nonlinearities such as frequency-dependent saturation and two-tone suppression, they could represent, regardless of sound intensity
level,
the waveform periodicity in the mating call of the green treefrog in terms of firing rates. None of these neurons represented a simple frequency analyzer shown in the linear bandpass filter array.
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