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The anatomy of visual neglect
Dominic J Mort1, Paresh Malhotra, Sabira K Mannan
1Division of Neuroscience and Psychological Medicine, Imperial College, London, UK.
Brain : a Journal of Neurology
|June 25, 2003
Summary
Visual neglect is linked to damage in the angular gyrus (inferior parietal lobe) and medial temporal lobe, challenging previous theories implicating the superior temporal gyrus.
Area of Science:
- Neuroscience
- Neurology
- Cognitive Science
Background:
- Visual neglect is a complex neurological disorder.
- The precise brain regions responsible for visual neglect are debated.
- Previous research suggested the superior temporal gyrus (STG) as a key area.
Purpose of the Study:
- To identify the critical brain regions associated with visual neglect.
- To investigate the role of the angular gyrus, superior temporal gyrus, and parahippocampal region in neglect.
- To challenge existing theories on the neuroanatomy of visual neglect.
Main Methods:
- Utilized high-resolution MRI to map lesions in 35 right-hemisphere stroke patients.
- Analyzed patients with middle cerebral artery (MCA) and posterior cerebral artery (PCA) territory strokes.
- Correlated lesion locations with the presence or absence of visual neglect.
Main Results:
- For MCA strokes, neglect was consistently associated with damage to the angular gyrus (inferior parietal lobe).
- The STG was damaged in only half of MCA neglect patients, indicating it's not critically involved.
- PCA strokes causing neglect were linked to lesions in the parahippocampal region (medial temporal lobe).
Conclusions:
- Damage to the angular gyrus (inferior parietal lobe) and the parahippocampal region (medial temporal lobe) are critically associated with visual neglect.
- Findings challenge the hypothesis that the STG is the primary region for neglect.
- The study implicates distinct posterior brain regions in the manifestation of visual neglect.