Frequency-intensity characteristics of cricket cercal interneurons: broadband units |
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Authors: | G I Rozhkova V Y Vedenina G Kämper |
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Institution: | 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: +49-731-5022629, DE
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Abstract: | The bilateral pairs of cercal interneurons 10-2a and 10-3a in the cricket terminal ganglion are supposed to constitute a
functional system for measuring the direction of air-borne signals, based on their phase-locked responses and selective directional
sensitivity. The purpose of this study was to obtain information on the frequency and intensity characteristics and thus the
potential working range of this system. By recording intracellularly from the axons of the interneurons we measured responses
for stimuli of varying frequency, intensity, and direction. Typically, the stimulus frequency range examined extended from
5 to 600 Hz, at intensities of 0.03–30 mm s−1 (peak-to-peak air-particle velocity). The results show that interneurons 10-2a and 10-3a preserved their level of activity,
response type, and direction tuning in the whole frequency range tested. Stimulus-response cross-correlograms revealed that
spike trains were synchronized with stimulus waves at even higher frequencies, at least up to 1000 Hz. At a given air-particle
velocity in the range of about 2–2.5 logarithmic units, the spike number responses of the interneurons were nearly constant
over a wide frequency range. Directional diagrams appeared to be independent of stimulus frequency, both in orientation and
in amplitude.
Accepted: 14 October 1998 |
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Keywords: | Sensory system Neural filter Frequency tuning Low-frequency sound Acheta domesticus |
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