We completely agree with Dr Levick and Dr Voneida that alternative explanations should be sought out whenever behavioral aspects, such as eye movements, are believed to indicate a physiological substrate. We believe that this is particularly true when an attempt is made to implicate, on that basis, neurophysiological involvement in psychopathology. However, we fail to see how the data reported by Dr Levick and Dr Voneida, or our findings as cited by them, suggest an alternative interpretation to the results of Schweitzer et al.1 What Schweitzer et al found was a preponderance of rightward eye movements among schizophrenics as compared to control subjects. Their finding is congruent with some of our own work.2 To the extent that eye movements are indicative of cerebral activation in the hemisphere contralateral to the direction of movement, these findings suggest that schizophrenia is associated with an overactivation of the left hemisphere.Clearly,
Gur RE, Gur RC. Eye Movements in Schizophrenic vs Normal Subjects-Reply. Arch Gen Psychiatry. 1979;36(4):494. doi:10.1001/archpsyc.1979.01780040136017
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