Related Experiment Videos
Hemispheric mediation of spatial attention: pseudoneglect after callosal stroke
David A Wolk1, H Branch Coslett
1Harvard Medical School, Department of Neurology, Brigham and Women's Hospital, Boston, MA 02120, USA. dwolke@partners.org
Annals of Neurology
|September 7, 2004
Summary
Patients with callosal strokes show each hemisphere directs spatial attention contralaterally. The corpus callosum integrates this hemispheric spatial information, crucial for attention and intention.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Neurology
Background:
- Investigating hemispheric specialization in spatial attention and intention.
- Understanding the role of the corpus callosum in interhemispheric communication.
Observation:
- Two patients with anterior callosal strokes were studied.
- Tasks included visual and tactile line bisection and pointing to body midline.
Findings:
- Patients bisected lines left of midline with the left hand and right of midline with the right hand.
- Similar performance patterns were observed in pointing tasks.
- Each hemisphere appears to control spatial attention towards contralateral space.
Implications:
- The corpus callosum is essential for integrating spatial information processed by each hemisphere.
- This integration is vital for unified spatial awareness and intention.
- Findings support models of contralateral spatial processing and interhemispheric integration.