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Journal of Experimental Biology, Vol 187, Issue 1 45-55, Copyright © 1994 by Company of Biologists

JOURNAL ARTICLES

AUDITORY THRESHOLD CHANGE IN SINGING CICADAS

R Hennig, T Weber, F Huber, H Kleindienst, T Moore and A Popov

The hearing sensitivity in singing cicadas is reduced during sound production by a folding of the tympanal membranes. Using electrophysiological recording and nerve stimulation techniques, we have shown an effect of the folded tympanum on the auditory threshold of two species of cicadas, Tibicen linnei and Okanagana rimosa. Auditory thresholds of both species increased by about 20 dB when the tympana folded during singing. In T. linnei the increase in threshold affected the whole frequency range, from 1 to 16 kHz, in a similar way. Electrical stimulation of one or both auditory nerves resulted in a folding of both tympanal membranes in a way very similar to that seen in singing animals. We have demonstrated that a cicada male is able to adjust its auditory threshold within a range of about 20 dB by the tympanal folding mechanism.


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© The Company of Biologists Ltd 1994