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Near and far visual space in unilateral neglect
P Vuilleumier1, N Valenza, E Mayer
1Department of Neurology, University Cantonal Hospital of Geneva, Switzerland.
Annals of Neurology
|March 20, 1998
Summary
This study reveals that visual neglect can affect far space but not near space, a finding opposite to previous cases. This suggests distinct neural systems for attention in different visual space compartments.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Clinical Neurology
Background:
- Unilateral spatial neglect (USN) is a common deficit following brain injury, typically affecting contralesional space.
- Previous research has suggested a unified system for spatial attention, but dissociations in neglect symptoms raise questions.
Observation:
- A patient with a right temporal hematoma presented with significant left visual neglect specifically for far space, but not near space.
- This contrasts with a previously reported patient with right parietal damage who exhibited neglect for near but not far space.
Findings:
- The current case demonstrates a dissociation where visual neglect is present for far extrapersonal space but absent for near extrapersonal space.
- The patient also exhibited distinct directional errors: rightward for far lines and leftward for near lines, further supporting spatial separation.
Implications:
- The findings support the hypothesis of distinct neural substrates for attention to different spatial extents (near vs. far) within the extrapersonal space.
- This dissociation has significant implications for understanding the neural organization of attention and for developing targeted rehabilitation strategies for spatial neglect.