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Evaluation of Auditory Brainstem Response in Chicken Hatchlings
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The auditory brainstem response in two lizard species.

Elizabeth F Brittan-Powell1, Jakob Christensen-Dalsgaard, Yezhong Tang

  • 1Department of Psychology, University of Maryland, College Park, Maryland 20742, USA. bbrittanpowell@psyc.umd.edu

The Journal of the Acoustical Society of America
|August 17, 2010
PubMed
Summary
This summary is machine-generated.

This study measured lizard hearing sensitivity using auditory brainstem response (ABR). Lizards showed good hearing up to 5 kHz, with anoles demonstrating superior high-frequency sensitivity compared to geckos.

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Area of Science:

  • * Zoology
  • * Bioacoustics
  • * Auditory Neuroscience

Background:

  • * Standard psychophysical methods for assessing hearing are impractical for lizards due to conditioning difficulties.
  • * Lizards possess sensitive auditory systems, but their precise hearing capabilities remain largely uncharacterized.
  • * The auditory brainstem response (ABR) offers a non-invasive approach to measure hearing sensitivity in animals.

Purpose of the Study:

  • * To establish a non-invasive method for measuring hearing sensitivity in lizards using ABR.
  • * To compare the hearing sensitivity of two lizard species: the Tokay gecko (Gekko gecko) and the green anole (Anolis carolinensis).
  • * To determine the frequency range and thresholds of hearing in these species.

Main Methods:

  • * Auditory brainstem response (ABR) was measured in sedated Tokay geckos (n=5) and green anoles (n=7) under 1% and 3% isoflurane anesthesia.
  • * Lizards were stimulated with click and tone burst stimuli to elicit ABR waveforms.
  • * Hearing sensitivity was determined by analyzing ABR thresholds across various frequencies.

Main Results:

  • * Both geckos and anoles exhibited peak auditory sensitivity between 1.6-2 kHz.
  • * Hearing sensitivity was similar for both species up to approximately 5 kHz (thresholds 20-50 dB SPL).
  • * Green anoles demonstrated significantly greater sensitivity (>20 dB) and a broader hearing range (1-7 kHz) above 5 kHz compared to Tokay geckos.

Conclusions:

  • * Auditory brainstem response (ABR) is a viable non-invasive technique for assessing hearing in lizards.
  • * Lizards possess a broad hearing range, comparable to or exceeding that of many bird species, particularly in the lower frequencies.
  • * Significant inter-species differences in high-frequency hearing sensitivity exist between Tokay geckos and green anoles.