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Related Concept Videos

Echo01:06

Echo

The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
Imagine the sound is reflected back to the ears. Assuming that the source is very close to the human, the difference between hearing the two sounds—the emitted sound and the reflected sound—may be more than the minimum time for perceiving distinct sounds. If this is the case, then the...

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Evaluation of Auditory Brainstem Response in Chicken Hatchlings
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Detection of interaural time differences in the alligator.

Catherine E Carr1, Daphne Soares, Jean Smolders

  • 1Department of Biology, University of Maryland, College Park, Maryland 20742-4415, USA. cecarr@umd.edu

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|June 26, 2009
PubMed
Summary

Crocodilians and birds share similar brain mechanisms for detecting interaural time differences (ITDs), crucial for sound localization. This study reveals that alligator auditory systems use coincidence-detecting neurons, similar to birds, to process timing cues.

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Area of Science:

  • Neuroscience
  • Bioacoustics
  • Evolutionary Biology

Background:

  • Auditory systems in birds and mammals rely on interaural time differences (ITDs) for sound localization.
  • Jeffress-type algorithms are proposed mechanisms for ITD sensitivity in birds, but their evolutionary stability is debated.

Purpose of the Study:

  • To investigate the evolutionary basis of ITD detection by examining the auditory system of crocodilians, the sister group to birds.
  • To determine if crocodilians utilize similar computational strategies for processing auditory timing information.

Main Methods:

  • In vivo electrophysiological recordings were performed on neurons in the nucleus laminaris (NL) of alligators.
  • Analysis focused on the timing of phase-locked spikes arriving from ipsilateral and contralateral auditory inputs.
  • A biologically detailed computational model of the NL was developed using alligator-specific parameters.

Main Results:

  • Neurons in the alligator nucleus laminaris (NL) function as coincidence detectors, responding maximally when inputs from both ears arrive simultaneously.
  • The model successfully discriminated ITDs up to 1 kHz, demonstrating the efficacy of the alligator's auditory processing.
  • Alligators represent a broader range of best ITDs (0-1000 microseconds) compared to birds, potentially related to their larger head size.

Conclusions:

  • Crocodilians and birds employ homologous, Jeffress-type algorithms for detecting interaural time differences.
  • The findings support the hypothesis that this auditory processing strategy is an evolutionarily stable trait.
  • Differences in ITD representation may be linked to morphological variations, such as head size, between species.