Unilateral visual neglect and wave P 300. A study of nine cases with unilateral lesions of the parietal lobes.
Wave P 300 was studied in nine patients with parietal lobe lesions who had visual neglect but no hemianopia. Stimulation of the hemispace contralateral to the lesion showed a lengthening in latency and a decrease in amplitude of P 300, specifically related to visual stimulation. Comparison with results obtained in 14 normal subjects and four patients with localized hemispheric lesions without visual neglect showed that changes in P 300 were specifically related to visual neglect. The parietal lobe lesions may disturb cerebral processes involved in discrimination and visual stimulus evaluation required to perform a task, inducing disturbance of the system responsible for P 300.
D000328:Adult; D000368:Aged; D001288:Attention / Q000502:physiology*; D001927:Brain Diseases / Q000503:physiopathology / Q000523:psychology; D005074:Evoked Potentials, Visual; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010296:Parietal Lobe / Q000503:physiopathology*; D014796:Visual Perception / Q000502:physiology*