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Evidence for the putative roles of GABAergic, cholinergic and octopaminergic pharmacology in the auditory system of the cricket Teleogryllus oceanicus

In the field cricket, Teleogryllus oceanicus, two types of auditory interneurons, AN2 and ON1, have been studied. AN2 responds best to ultrasound frequencies (≥20kHz) produced by echolocating bats and initiates negative phonotaxis by the cricket. ON1 responds to both low (4-5kHz) and high frequency sounds and encodes the temporal information present in sounds of both frequencies. ON1 also provides lateral inhibition to contralateral interneurons, such as AN2, thereby enhancing binaural contrast. The pharmacology associated with these two interneurons is investigated here. ON1's response to 4.5kHz sound is increased following picrotoxin application, while it's ability to encode temporal information present in low and high frequency sounds is reduced. An increase in spiking response and a decrease in response latency to low frequency sound is produced by the addition of atropine, while d-tubocurarine application increased ON1's response latency to both 4.5kHz and 30kHz sound. The neuromodulator octopamine reduced AN2's response to ultrasound.

Identiferoai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.97979
Date January 2005
CreatorsNaraine, Kim.
PublisherMcGill University
Source SetsLibrary and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada
LanguageEnglish
Detected LanguageEnglish
TypeElectronic Thesis or Dissertation
Formatapplication/pdf
CoverageMaster of Science (Department of Biology.)
Rights© Kim Naraine, 2005
Relationalephsysno: 002487109, proquestno: AAIMR24754, Theses scanned by UMI/ProQuest.

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