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Journal of Experimental Biology 60,861-869 (1974)
Published by Company of Biologists 1974

The Physiology of the Tettigoniid Ear : IV. A New Hypothesis for Acoustic Orientation Behaviour

D. B. LEWIS ¹

¹ Animal Acoustics Unit, City of London Polytechnic

1. The thresholds for the spiracle and for the tympanal slits have been determined at a variety of angles to the body axis and show little directionality.

2. A difference in threshold levels of 20 dB exist between the ipsilateral and contralateral whole organs in the frequency range 1-20 kHz.

3. Single-frame exposures of a video-tape recording show that the spiracular dimensions do not change during stridulation.

4. In the light of the evidence, a new hypothesis for acoustic orientation behaviour is advanced.

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