Computer analysis of optokinetic pattern test for patients with localized lesions of unilateral frontal eye fields

Four patients with localized lesions of the left frontal eye field as demonstrated at autopsy or MRI were studied. Their electronystagmography (ENG) recordings, which were induced by optokinetic stimulus, were analyzed by computer. Four factors were calculated by the ENG analyzing program. We conclude that the asymmetry of OKP in patients with localized lesions of the unilateral frontal eye fields is primarily caused by impaired S-VEL and F-VEL of the contralateral OKN compared with the side of the frontal eye field lesion.