Tone-derived vs. tone-in-noise-derived filter functions of frog auditory nerve fibers: a comparison.
Intracellular recordings were made from 112 auditory nerve fibers of Rana pipiens pipiens. For each fiber, we determined its frequency-threshold curve (FTC), and its threshold to CF-tones simultaneously masked by either cosinusoidal or inverted comb-filtered noise (CFN). From the difference between the masked thresholds using cosinusoidal and inverted CFN, the filter function of the auditory fiber was calculated based on a constant signal-to-noise algorithm (Pick, 1980). The calculated filter functions and FTCs were then compared. Of the 63 comparisons made, 42 were statistically indiscriminable, 15 fibers produced a calculated filter function that differed significantly in shape from the FTC, and six fibers produced a flat filter function. We conclude by evaluating our methods, especially for the experimental conditions found in the frog, and compare and contrast our results with those observed in mammalian systems.
Dunia
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Department of Biology, University of California, Los Angeles 90024.
Narins
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PM
D000161:Acoustic Stimulation / Q000295:instrumentation / Q000379:methods; D000818:Animals; D001309:Auditory Threshold; D003198:Computer Simulation; D008954:Models, Biological; D010470:Perceptual Masking / Q000502:physiology*; D011894:Rana pipiens; D000159:Vestibulocochlear Nerve / Q000502:physiology*