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Bioacoustics journal
Authors: Alves, D & Fonseca, P J
Year: 2012
Volume: 21
Issue: 1
From page: 65
Abstract:
Mate finding in the cicada Tettigetta josei is mediated by acoustic communication. The species-specific male song is composed by complex
phrases and the shortest pulse periods vary between 4 and 8 ms, depending on the body temperature. Here we investigated if the central
nervous system is able to resolve the fine time structure of the song and the temperature dependence of these responses. Intracellular
recordings of auditory interneurons in the metathoracic-abdominal ganglionic complex and simultaneous auditory nerve recordings were
obtained. The experimental stimuli were the species’ calling song pulses presented at different rates. Body temperature was controlled with a
Peltier element. PSTH and vector strength analysis indicate that some interneurons were able to resolve pulse periods in the 3-4 ms range
when the body temperature was above 24 – 26 ºC (n=6). These cells were able to resolve pulse periods of 6-8 ms even when the body
temperature was at 16º C. The auditory periphery does not seem to be a limiting factor as averaging analysis in the whole nerve recordings
shows that the pooled receptor response is able to resolve gaps of at least 1-2 ms in the whole temperature range tested (16-28ºC). Further
studies will be necessary in order to test whether this temporal resolution is maintained at the brain level.
Categories: invertebrates insects
Time resolution in the auditory pathway of the cicada Tettigetta josei
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