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Lateralization, connectivity and plasticity in the human central auditory system.

Dave R M Langers1, Pim van Dijk, Walter H Backes

  • 1Department of Radiology, Maastricht University Hospital, P.O. Box 5800, 6202 AZ Maastricht, The Netherlands.

Neuroimage
|July 30, 2005
PubMed
Summary

Auditory processing in the human brain shows contralateral activation in the temporal lobe, thalamus, and midbrain. Subcortical pathways cross audtory information early, with plasticity only at cortical levels in unilaterally deaf individuals.

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Human Neuroimaging

Background:

  • Auditory cortex responses are predominantly contralateral.
  • Lateralization and subcortical interactions in the human central auditory system are poorly understood.

Purpose of the Study:

  • Investigate the lateralization of auditory processing in subcortical structures.
  • Examine functional interactions between auditory processing centers.
  • Compare auditory processing in normal hearing and unilaterally deaf subjects.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) with varying left and right sound intensities.
  • Connectivity analyses to map auditory information flow.
  • Comparison of activation patterns between normal hearing and unilaterally deaf individuals.

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Main Results:

  • Contralateral activation observed in the temporal lobe, thalamus, and midbrain in normal hearing subjects.
  • Auditory information crosses in the lower brainstem and travels ipsilaterally to the cortex.
  • Unilaterally deaf subjects showed more symmetrical cortical activation but contralateral subcortical activation.
  • No subcortical plastic reorganization was evident; differences were only at cortical connection strengths.

Conclusions:

  • Auditory signal processing involves contralateral crossing in the lower brainstem and subsequent ipsilateral conduction to the cortex.
  • Subcortical auditory pathways maintain contralateral dominance even in cases of unilateral deafness.
  • Auditory system plasticity in response to hearing loss is primarily observed at the cortical level, not subcortically.