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Keefe et al¹ recently reported the interesting finding that qualitative ratings of smooth pursuit eye movements were more powerful than quantitative measures in discriminating relatives of patients with schizophrenia from control subjects. Their quantitative measures included gain and frequency of small and large saccades. They remarked that "qualitative and quantitative measures of eye tracking may reflect independent dimensions of disturbance."¹(p175) We attempted to test this idea by examining the relationship between qualitative and quantitative measures of eye tracking in a sample of schizophrenic patients.

Subjects and Methods

Seventy-six schizophrenic patients participated in the study. Fifty-three of these patients were part of an earlier study on smooth pursuit and schizophrenia.² Most of the methods were identical to those of the earlier study and therefore will be presented only briefly here. Patients were screened to exclude those with medical illnesses or those receiving medications that could adversely affect smooth pursuit. All patients were clinically . . . [Full Text of this Article]

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