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Related Concept Videos

The Auditory Ossicles01:11

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Related Experiment Video

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Optogenetic Stimulation of the Auditory Nerve
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Behavioral and neural auditory thresholds in a frog.

Ryan C Taylor1,2,3, Karin Akre1, Walter Wilczynski4

  • 1Department of Integrative Biology, University of Texas at Austin, Austin, TX, USA.

Current Zoology
|July 3, 2019
PubMed
Summary

Understanding acoustic sexual displays requires knowing auditory detection thresholds. This study reveals varied detection thresholds in túngara frogs across behavioral and neural measures, emphasizing receiver-based perception.

Keywords:
Physalaemus pustulosusanuransauditory brainstem responsesauditory thresholdsmate choicesexual selectionsignal recognition thresholdstúngara frogsvocalizations

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Area of Science:

  • Bioacoustics
  • Neuroethology
  • Sexual Selection

Background:

  • Acoustic sexual displays are crucial for mate recognition and choice in many species.
  • The ability of receivers to detect these signals is fundamental to their effectiveness.
  • A key question links neurobiology and sexual selection: what are the auditory detection thresholds for sexual signals?

Purpose of the Study:

  • To determine the auditory detection thresholds for acoustic sexual displays in túngara frogs.
  • To compare thresholds obtained through different measurement methods.
  • To understand the implications of varying thresholds for signal salience and perception.

Main Methods:

  • Assessed auditory detection thresholds using three distinct methods in túngara frogs.
  • Methods included: behavioral responses, auditory brainstem responses, and multiunit electrophysiological recordings from the midbrain.
  • Compared threshold estimates derived from behavioral and neural assays.

Main Results:

  • Multiunit electrophysiological recordings showed the lowest detection thresholds (approximately 45 dB SPL).
  • Behavioral responses yielded intermediate thresholds (approximately 61 dB SPL).
  • Auditory brainstem responses exhibited the highest thresholds (approximately 71 dB SPL).

Conclusions:

  • Different methods yield distinct auditory detection thresholds, reflecting either physiological or behavioral salience.
  • It is unlikely that behavioral and physiological thresholds should be identical.
  • Appreciating the detection and salience of acoustic signals necessitates considering the receiver's auditory system.