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Related Concept Videos

Echo01:06

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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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Multiple comparison test, abbreviated as MCT, is a post hoc analysis generally performed after comparing multiple samples with one or more tests. An MCT will help identify a significantly different sample among multiple samples or a factor among multiple factors.
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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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Related Experiment Video

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An Automated System for Sound Localization Testing in Hearing-Impaired Listeners
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Simultaneous comparison of two sound localization measures.

Amy E Jones1, Janet L Ruhland1, Yan Gai1

  • 1Department of Neuroscience, University of Wisconsin, Madison, WI 53706, USA.

Hearing Research
|September 28, 2014
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Summary

This study compared sound localization using walking versus head and eye movements in cats. Results show distinct neural systems for orienting gaze and executing a walking response to sound.

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Area of Science:

  • Neuroscience
  • Animal Behavior
  • Auditory Perception

Background:

  • Sound localization is crucial for survival.
  • Behavioral studies typically use approach-to-target or orienting tasks.
  • Direct comparisons between these tasks are scarce.

Purpose of the Study:

  • To compare absolute sound localization performance using approach-to-target and orienting tasks in cats.
  • To investigate the relationship between initial orienting responses and subsequent motor actions.

Main Methods:

  • Cats were trained to localize broadband noise from speakers at various azimuth angles.
  • Localization was assessed via walking to a lever and by recording head and eye movements using magnetic search coils.
  • Stimulus duration and level were manipulated to alter task difficulty.

Main Results:

  • Localization accuracy declined with reduced stimulus duration or level for both measures.
  • When the task was difficult, incorrect and no-go responses increased.
  • Dissociations were observed between orienting movements and target selection, and between orienting and walking responses.

Conclusions:

  • Sound localization performance is sensitive to stimulus parameters in both tasks.
  • Different neural systems may underlie gaze orienting and walking responses to auditory targets.
  • This suggests a complex interplay between sensory perception and motor control in sound localization.