Optokinetic nystagmus in cerebral disease

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Abstract
The optokinetic response was analyzed in 14 cases of cerebral disease that came to autopsy examination; 6 of these cases had positive (asymmetric) optokinetic nystagmus signs and had parietal lobe lesions. Lesions of temporal, occipital, and frontal lobes were found in 3 cases, respectively, with no parietal involvement. The optokinetic nystagmus sign was negative in these cases. Complicating factors in interpretation of the other 5 cases have been discussed. A frequent occurrence noted in cases with positive optokinetic nystagmus signs was concomitant involvement of the thal-amus. This would not be unexpected with lesions involving the middle and posterior one-third of the optic radiations, deep in the posteroin-feromedial parietal lobe. It is concluded that a positive optokinetic nystagmus sign in cortical lesions is most suggestive of involvement of the parietal lobe.

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