The electrical response of the auditory mechanism in the bullfrog (Rana Catesbeiana)

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Potentials in response to pure tones were greater from the preilymphatic space near the posterior semicircular canal than from the prootic bone near the canals. Responses were reduced by cutting the columella. “Evidence was obtained for contralateral stimulation via the Eustachian tubes and the pharyngo-oral cavity. A possible use of this stimulation in sound localization was suggested.” Potentials declined rapidly with certain drugs and impending death. The range of hearing extends from a few cycles to 3000 or 4000, with fair sensitivity up to 1800, but falling off rapidly for higher tones. It would seem the frog has poor loudness discrimination for all but the weakest sounds. From Psyc Abstracts 36:01:1DI57S. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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