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Conflict and integration of spatial attention between disconnected hemispheres
1Department of Rehabilitation, Tokyo Metropolitan Institute for Neuroscience, 2-6 Musashidai, Fuchu City, Tokyo 183-8526, Japan. ishiai@tmin.ac.jp
Journal of Neurology, Neurosurgery, and Psychiatry
|September 19, 2001
Summary
Callosa disconnection can cause left unilateral spatial neglect, leading to rightward line bisection errors due to left hemisphere attentional bias. The intact right hemisphere may achieve accurate bisection by integrating attention.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Ophthalmology
Background:
- Investigating hemispheric interaction in spatial attention and line bisection.
- Understanding the role of the corpus callosum in integrating visual information.
Observation:
- A patient with callosal infarction and left cingulate gyrus lesion bisected lines.
- Eye movements and manual responses were recorded during line bisection tasks.
Findings:
- Right-hand bisection resulted in rightward errors, suggesting left hemisphere attentional bias.
- Left-hand bisection initially showed leftward errors, improving to accuracy as the right hemisphere integrated attention.
- Damage to the corpus callosum impaired interhemispheric attention integration, causing spatial neglect.
Implications:
- Callosal disconnection can lead to unilateral spatial neglect and biased attention.
- Accurate line bisection relies on effective interhemispheric integration of spatial attention.
- Findings highlight the distinct attentional control mechanisms of each hemisphere.