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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/25411

Title: Coding of Bat-like Auditory Features in the AN2 Interneuron of the Pacific Field Cricket, Teleogryllus oceanicus and its Relation to Decreasing the Conspicuousness of Synthetic Bat Echolocation Calls
Authors: Asi, Navdeep Singh
Advisor: Fullard, James H.
Department: Cell and Systems Biology
Keywords: Neuroethology
Cricket
Bat echolocation
AN2
Neural coding of behaviour
Teleogryllus oceanicus
Escape behaviour
Issue Date: 14-Dec-2010
Abstract: Many insects have auditory systems capable of detecting the ultrasonic calls of insectivorous bats and use these cues to evade capture. I tested the hypothesis that bats can decrease the conspicuousness of their echolocation calls by varying three call features: duration, repetition rate and ramp times. This was done by examining the AN2 command interneuron’s response to these features in the cricket, Teleogryllus oceanicus, after describing the firing pattern necessary for evasive behaviour. Past studies on duration and repetition rate suggest increased thresholds for short durations and low repetition rates. Measurements of the AN2 response, which controls evasive behaviour, indicated that increased thresholds were a result of a decrease in bursting, raw spike numbers and an increase in latencies in the AN2. Results suggest that there is pressure on bats to evade early detection and that this can be done by employing large ramp times in search phase echolocation calls.
URI: http://hdl.handle.net/1807/25411
Appears in Collections:Master
Department of Cell and Systems Biology - Master theses

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