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[Neuropsychological disorders in minor hemisphere damage]
1Department of Rehabilitation, Tokyo Metropolitan Institute for Neuroscience.
Rinsho Shinkeigaku = Clinical Neurology
|May 13, 1998
Summary
Right hemisphere damage can cause neuropsychological disorders like unilateral spatial neglect, often linked to attention deficits. Other factors like motivational issues can also contribute to neglect symptoms.
Area of Science:
- Neuroscience
- Neurology
- Cognitive Psychology
Context:
- Right hemisphere damage in most right-handed individuals leads to various neuropsychological deficits.
- Unilateral spatial neglect, characterized by failure to respond to left-sided stimuli, is a common consequence.
- Lesions in the inferior parietal lobule and specific arterial territories (middle cerebral artery, anterior choroidal artery) are frequently implicated in neglect.
Purpose:
- To explore the mechanisms and contributing factors of neuropsychological disorders following right hemisphere damage.
- To differentiate the presentation and severity of neglect based on lesion location.
- To investigate the role of attentional mechanisms and non-spatial factors in neglect.
Summary:
- Unilateral spatial neglect arises from impaired spatial attention, including rightward bias and difficulties disengaging attention.
- While frontal lesions cause milder neglect, severe cases are linked to middle cerebral or anterior choroidal artery infarctions.
- Non-spatial factors like motivation and cognitive strategy use also influence neglect, and anosognosia for hemiplegia is common after right hemisphere strokes.
Impact:
- Understanding these deficits aids in diagnosing and managing patients with right hemisphere injuries.
- Identifying the neural correlates of spatial attention provides insights into brain function.
- This research can inform the development of targeted rehabilitation strategies for patients with neglect and related disorders.