Firing-rate resonances in the peripheral auditory system of the cricket, Gryllus bimaculatus
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In many communication systems, information is encoded in the temporal pattern of signals. For rhythmic signals that carry information in specific frequency bands, a neuronal system may profit from tuning its inherent filtering properties towards a peak sensitivity in the respective frequency range. The cricket Gryllus bimaculatus evaluates acoustic communication signals of both conspecifics and predators. The song signals of conspecifics exhibit a characteristic pulse pattern that contains only a narrow range of modulation frequencies. We examined individual neurons (AN1, AN2, ON1) in the peripheral auditory system of the cricket for tuning towards specific modulation frequencies by assessing their firing-rate resonance. Acoustic stimuli with a swept-frequency envelope allowed an efficient characterization of the cells’ modulation transfer functions. Some of the examined cells exhibited tuned band-pass properties. Using simple computational models, we demonstrate how different, cell-intrinsic or network-based mechanisms such as subthreshold resonances, spike-triggered adaptation, as well as an interplay of excitation and inhibition can account for the experimentally observed firing-rate resonances. Therefore, basic neuronal mechanisms that share negative feedback as a common theme may contribute to selectivity in the peripheral auditory pathway of crickets that is designed towards mate recognition and predator avoidance.
KeywordsAuditory processing Acoustic communication Neuron models Band-pass filtering Negative feedback
This work was funded by grants from the Federal Ministry of Education and Research, Germany (01GQ1001A, 01GQ0901, 01GQ0972, 01GQ1403) and the Deutsche Forschungsgemeinschaft (SFB618, GRK1589/1). We are grateful to Wei Wu for valuable discussion. We thank Manuel Gersbacher, Michael Reichert, Frederic Römschied, Jan-Hendrik Schleimer and Vanessa Stempel for helpful comments on the manuscript.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
The experiments conducted in this study comply with the current laws of Germany and the Principles of animal care, publication No. 86–23, revised 1985 of the National Institute of Health.
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