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Adaptation of auditory receptors in the cricket Teleogryllus oceanicus : implications for sound localisation

Crickets rely on binaural comparisons of intensity to locate sound. Intensity can be encoded by response magnitude as well as response latency. The effects of sound intensity and pulse repetition rate on the auditory responses of the tympanal nerve were investigated. Adaptation, a decline in the response due to repeated stimulation, is greater for higher pulse rates and higher intensities. Since sound intensity is louder at the ear closer to the sound source, adaptation is more pronounced in the ipsilateral ear. As a result, the interaural difference in response magnitude decreases. Therefore response magnitude cannot be a reliable cue for sound location. I found that response latency also adapts: it increases over time. However, this change is not intensity dependent. So interaural latency difference is stable over time. The results show that interaural latency difference is a more reliable cue than interaural magnitude difference to locate sound.

Identiferoai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.29895
Date January 1999
CreatorsGivois, Véronique.
ContributorsPollack, Gerald S. (advisor)
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.)
RightsAll items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated.
Relationalephsysno: 001686483, proquestno: MQ55061, Theses scanned by UMI/ProQuest.

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