| The auditory brainstem response in two lizard species. | |
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MedLine Citation:
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PMID: 20707448 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Although lizards have highly sensitive ears, it is difficult to condition them to sound, making standard psychophysical assays of hearing sensitivity impractical. This paper describes non-invasive measurements of the auditory brainstem response (ABR) in both Tokay geckos (Gekko gecko; nocturnal animals, known for their loud vocalizations) and the green anole (Anolis carolinensis, diurnal, non-vocal animals). Hearing sensitivity was measured in 5 geckos and 7 anoles. The lizards were sedated with isoflurane, and ABRs were measured at levels of 1 and 3% isoflurane. The typical ABR waveform in response to click stimulation showed one prominent and several smaller peaks occurring within 10 ms of the stimulus onset. ABRs to brief tone bursts revealed that geckos and anoles were most sensitive between 1.6-2 kHz and had similar hearing sensitivity up to about 5 kHz (thresholds typically 20-50 dB SPL). Above 5 kHz, however, anoles were more than 20 dB more sensitive than geckos and showed a wider range of sensitivity (1-7 kHz). Generally, thresholds from ABR audiograms were comparable to those of small birds. Best hearing sensitivity, however, extended over a larger frequency range in lizards than in most bird species. |
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Authors:
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Elizabeth F Brittan-Powell; Jakob Christensen-Dalsgaard; Yezhong Tang; Catherine Carr; Robert J Dooling |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of the Acoustical Society of America Volume: 128 ISSN: 1520-8524 ISO Abbreviation: J. Acoust. Soc. Am. Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-08-16 Completed Date: 2011-01-27 Revised Date: 2011-08-03 |
Medline Journal Info:
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Nlm Unique ID: 7503051 Medline TA: J Acoust Soc Am Country: United States |
Other Details:
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Languages: eng Pagination: 787-94 Citation Subset: IM |
Affiliation:
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Department of Psychology, University of Maryland, College Park, Maryland 20742, USA. bbrittanpowell@psyc.umd.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acoustic Stimulation Animals Auditory Pathways / physiology* Auditory Threshold Brain Stem / physiology* Evoked Potentials, Auditory, Brain Stem Lizards / physiology* Reaction Time Time Factors Vocalization, Animal |
| Grant Support | |
ID/Acronym/Agency:
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DC00436/DC/NIDCD NIH HHS; P30DC004664/DC/NIDCD NIH HHS |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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