CAPSULES: A Swinging Test

A diagnosis of schizophrenia is difficult at best; identifying a person who may develop schizophrenia in the future has so far been impossible. Now a University of Chicago research team reports that it has found a way, almost as simple as the hammer-and-knee-jerk reflex test, to do both. The test involves observing the patient's eye movements as he follows the swing of a pendulum.

When a person watches a moving object, he uses an eye movement called pursuit, in which the eyeballs move back and forth to maintain a stable image. This is no problem for most people, but Dr....

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