Frequency-intensity characteristics of cricket cercal interneurons: low-frequency-sensitive units |
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| Authors: | V. Y. Vedenina G. I. Rozhkova A. K. Panjutin A. L. Byzov G. Kämper |
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| Affiliation: | Institute for Problems in Information Transmission, Russian Academy of Sciences, B. Karetnyi per. 19, 10447 Moscow, Russia, RU
Abteilung Vergleichende Neurobiologie, Universit?t Ulm, D-89069 Ulm, Germany e-mail: guenter.kaemper@biologie.uni-ulm.de Fax: +49-731-502-2629, DE
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| Abstract: | Three identified interneurons of the cercal system were investigated electrophysiologically; these interneurons are sensitive only to stimulation of cercal filiform-hair sensilla by low-frequency sound. Measurement of the frequency ranges revealed cut-off frequencies between ca. 20 and 70 Hz. Analysis of the responses near threshold and at higher intensities in the frequency range 5–500 Hz shows that one of them (Interneuron 9-1b) exhibits a sensitivity maximum at the frequency-intensity combination necessary for the perception of an intraspecific signal at 30 Hz. This band-pass behavior disappears at higher stimulus intensities. In order to investigate the mechanism of the low-frequency selectivity of the interneurons, two-tone stimulation experiments were performed. When stimuli in the best-frequency range were superimposed by a 100-Hz tone, the spiking activity was suppressed in an intensity-dependent manner. Accepted: 22 July 1998 |
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| Keywords: | Sensory systems Acheta domesticus Neural filter Air-particle oscillation Low-pass |
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