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Distortion of auditory space in hemianopia
Jörg Lewald1, Sören Peters, Martin Tegenthoff
1Leibniz Research Centre for Working Environment and Human Factors, Research Group Ageing and CNS Alterations, Dortmund, Germany. joerg.lewald@rub.de
The European Journal of Neuroscience
|September 23, 2009
Summary
Homonymous hemianopia (visual field loss) causes slight auditory space distortions, suggesting visual miscalibration of hearing. This indicates long-term cross-modal adaptation, not compensatory plasticity, in patients.
Area of Science:
- Neuroscience
- Auditory Perception
- Visual Neuroscience
Background:
- Homonymous hemianopia results from unilateral brain lesions affecting visual pathways.
- Visual field defects are known to cause spatial distortions.
- Cross-modal plasticity can alter sensory perception after brain injury.
Purpose of the Study:
- To investigate long-term cross-modal spatial adaptation in homonymous hemianopia.
- To determine if visual space distortion influences auditory space perception.
- To differentiate between adaptation and compensatory plasticity in hemianopic patients.
Main Methods:
- Sound localization tasks (head and manual pointing) were used.
- Tests were conducted in anechoic, dark conditions.
- Patient performance was compared to normal controls.
Main Results:
- Homonymous hemianopia patients showed systematic errors in sound localization.
- Auditory space appeared compressed or rotated towards the blind side.
- Sound localization precision was reduced in both visual hemifields.
Conclusions:
- Visual miscalibration of auditory space occurs in homonymous hemianopia.
- Findings support long-term cross-modal spatial adaptation.
- Compensatory plasticity mechanisms were not evident.
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