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Related Experiment Videos

Contrasting spatial hearing deficits in hemianopia and spatial neglect.

G Kerkhoff1, F Artinger, W Ziegler

  • 1EKN-Clinical Neuropsychology Research Group, Department of Neuropsychology, City Hospital Bogenhausen, Munich, Germany.

Neuroreport
|January 5, 2000
PubMed
Summary

Spatial hearing deficits vary with brain lesions. Hemianopia shifts auditory perception towards the blind side, while hemispatial neglect causes ipsilesional deviation, revealing multisensory influences on directional hearing.

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Spatial Cognition

Background:

  • Spatial hearing deficits are linked to various brain pathologies.
  • The precise mapping of auditory spatial deficits after cortical lesions remains poorly understood compared to vision and touch.

Purpose of the Study:

  • To investigate the topography of auditory subjective straight ahead (SSA) deficits following unilateral cortical lesions.
  • To differentiate the impact of hemianopia and hemispatial neglect on auditory spatial perception.

Main Methods:

  • Utilized a novel binaural sound source simulation technique with head-related transfer functions.
  • Delivered broad-band single pulses at 5-degree resolution via headphones to assess SSA judgments.
  • Compared auditory SSA in normal subjects, patients with hemispatial neglect, hemianopia, and control patients with unilateral lesions.

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Main Results:

  • Normal subjects exhibited accurate SSA judgments with a slight leftward shift (-1.7 degrees).
  • Hemispatial neglect patients showed a significant ipsilesional deviation of auditory SSA (+22 degrees).
  • Hemianopic patients displayed deviations towards their blind hemifield (+10 and -28 degrees), while controls had normal SSA judgments.

Conclusions:

  • Unilateral cortical lesions exert contrasting influences on directional spatial hearing, specifically hemianopia and hemispatial neglect.
  • Findings support the hypothesis of multisensory convergence, particularly visual and auditory information, in directional spatial hearing.