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A Method to Study Adaptation to Left-Right Reversed Audition
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Hemispheric competence for auditory spatial representation.

Lucas Spierer1, Anne Bellmann-Thiran, Philippe Maeder

  • 1Neuropsychology and Neurorehabilitation Service, Vaudois University Hospital Center and University of Lausanne, Lausanne, Switzerland. lucas.spierer@chuv.ch

Brain : a Journal of Neurology
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Summary
This summary is machine-generated.

The right hemisphere is crucial for sound localization, particularly using interaural time differences (ITDs). Right-hemisphere damage causes more severe sound localization deficits than left-hemisphere damage.

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Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example

Published on: October 24, 2012

Area of Science:

  • Neuroscience
  • Auditory Perception
  • Psychoacoustics

Background:

  • Sound localization depends on interaural time differences (ITDs), interaural intensity differences (IIDs), and outer ear attenuation.
  • The distinct roles of ITDs and IIDs in sound localization, especially concerning hemispheric contributions, require further investigation.

Purpose of the Study:

  • To investigate the relative contributions of ITD and IID cues to sound localization.
  • To determine the impact of focal left and right hemispheric brain damage on sound localization abilities.

Main Methods:

  • Tested 60 healthy subjects, including 25 with focal left and 25 with focal right hemispheric brain damage.
  • Employed group and single-case behavioral analyses with anatomo-clinical correlations.

Main Results:

  • Deficits were more frequent and severe after right than left hemispheric lesions.
  • Processing of ITDs was more impaired than IIDs, especially after right hemispheric damage.
  • Right-hemisphere damage led to deficits in both hemispaces and alloacusis; left-hemisphere damage caused deficits only in the contralesional hemispace.

Conclusions:

  • A binaural sound localization system exists, predominantly using ITDs and supported by the right hemisphere.
  • Distinct mechanisms contribute to spatial coordinate computation and global auditory spatial representation, with right temporo-parietal cortices playing a key role.