Unilateral visual neglect and wave P 300. A study of nine cases with unilateral lesions of the parietal lobes
F. Lhermitte, E. Turell, D. LeBrigand and F. Chain
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.
