Abstract
Nine patients with right frontal lobe lesions were evaluated for double scnsory stimulation, line bisection, figure drawing, line canceration, hemiparesis, hemianopia and Wecksler Adult Intelligence Scale. The lesions consisted of carebral infarction, putaminal hemorrhage, subcortical hemorrhage, cerebral contusion, arteriovenous malformation and brain tumor.
Four patients showed unilateral spatial neglect (USN) for three weeks up to several month after onset. The CT findings of these patients showed a frontal cortex with widespread subcortical area, middle-size basal ganglia, or frontoparietal lesions.
Five patients did not show USN. They had frontal base, localized prefrontal lobe, or small basal gangelia lesions.
It is concluded from these findings that cases of right frontal lobe USN are caused by disruption of a corticolimbic retiicular loop.
