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Related Concept Videos

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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.
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Related Experiment Video

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Auditory evoked potentials in a bottlenose dolphin during moderate-range echolocation tasks.

James J Finneran1, Jason Mulsow2, Dorian S Houser2

  • 1U.S. Navy Marine Mammal Program, Space and Naval Warfare Systems Center Pacific, Code 71510, 53560 Hull Street, San Diego, California 92152.

The Journal of the Acoustical Society of America
|February 12, 2015
PubMed
Summary
This summary is machine-generated.

Bottlenose dolphins use automatic gain control to adjust auditory responses to echoes. This system maintains consistent echo-evoked potential amplitudes at close ranges but has limitations at greater distances.

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Area of Science:

  • Marine biology
  • Bioacoustics
  • Auditory neuroscience

Background:

  • Echolocating odontocetes (toothed whales) utilize complex auditory processing for navigation and foraging.
  • Automatic gain control (AGC) is hypothesized to play a role in mediating auditory responses to echoes in these animals.

Purpose of the Study:

  • To investigate the mechanisms of automatic gain control in bottlenose dolphins (Tursiops truncatus).
  • To determine how AGC affects auditory evoked potentials (AEPs) in response to simulated echoes across varying distances.

Main Methods:

  • Utilized a phantom echo generator to present controlled auditory stimuli to a bottlenose dolphin.
  • Recorded auditory evoked potentials (AEPs) in response to outgoing sonar clicks and simulated returning echoes.
  • Simulated target ranges from 2.5 to 80 meters, manipulating echo levels and geometric spreading loss.

Main Results:

  • Echo-evoked potential amplitudes remained relatively constant up to 14 meters when geometric spreading loss was simulated.
  • When echo levels were constant relative to clicks, AEP amplitudes increased with simulated range up to 80 meters.
  • AGC appears to maintain distance-independent AEP amplitudes at close ranges but does not fully compensate for attenuation at longer ranges.

Conclusions:

  • Automatic gain control in bottlenose dolphins functions to maintain consistent echo perception at shorter distances.
  • The AGC mechanism involves both transmitter and receiver processes, creating distinct short-range and long-range response characteristics.
  • Findings suggest a sophisticated auditory processing system that adapts to target echo characteristics based on range.