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Journal of Experimental Biology, Vol 201, Issue 24 3419-3424, Copyright © 1998 by Company of Biologists

JOURNAL ARTICLES

Intensity responses of the single auditory receptor of notodontid moths: a test of the peripheral interaction hypothesis in moth ears

JH Fullard, E Forrest and A Surlykke
Department of Zoology, Erindale College, University of Toronto, Mississauga, Ontario, Canada L5L 1C6 and Center for Sound Communication, Institute of Biology, Odense University, Odense M, DK-5230, Denmark. jfullard@credit.erin.utoront.

It has been proposed that the most sensitive auditory receptor cell (A1) in the two-celled ears of certain noctuoid moths is inhibited by its partner, the A2 cell, at high stimulus intensities. We used the single-celled ears of notodontid moths, also noctuoids, to test this hypothesis. The A1 cells of all but one of the moths tested exhibited non-monotonic firing rates, with reduced firing rates at high stimulus intensities and showing no relationship to the firing rate of the only other receptor, the non-auditory B cell. These results challenge the peripheral interaction hypothesis for A1 firing patterns in two-celled moth ears. An examination of notodontid A1 adaptation rates and laser vibrometry results suggests that receptor adaptation and tympanal motion non-linearity are more likely explanations for the non-monotonic receptor firing observed in both single- and multi-celled moth ears.

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