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Neck-proprioceptive influence on auditory lateralization.

J Lewald1, H O Karnath, W H Ehrenstein

  • 1Fakultät für Psychologie, Ruhr-Universität, Bochum, Germany. joerg.lewald@ruhr-uni-bochum.de

Experimental Brain Research
|May 14, 1999
PubMed
Summary
This summary is machine-generated.

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Neck vibration influences how we perceive sound location. This study shows neck proprioception affects auditory spatial processing, shifting the perceived sound towards the vibration side.

Area of Science:

  • Neuroscience
  • Auditory Perception
  • Somatosensation

Background:

  • Sound lateralization relies on binaural cues and central processing.
  • The role of somatosensory input, particularly from neck proprioceptors, in auditory spatial perception is not fully understood.

Purpose of the Study:

  • To investigate the effect of transcutaneous posterior neck muscle vibration on dichotic sound lateralization in humans.
  • To determine if neck proprioception influences the perceived location of auditory stimuli.

Main Methods:

  • Human subjects performed two-alternative forced-choice (left/right) judgments of acoustic stimuli.
  • Auditory stimuli were presented with varying interaural level differences via headphones.
  • Transcutaneous vibration was applied to the posterior neck muscles during auditory testing.

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Main Results:

  • A significant shift in the subjective auditory median plane towards the side contralateral to the vibration was observed.
  • Sound was perceived as shifted towards the side of neck vibration.
  • The mean magnitude of this vibration-induced intracranial shift was 1.5 dB.

Conclusions:

  • Neck proprioceptive input significantly influences sound lateralization.
  • This somatosensory information is integrated by the central nervous system.
  • Auditory spatial coordinates are transformed onto a body-centered reference frame, incorporating neck proprioception.