Nystagmus as a Criterion of Hypnotically Induced Visual Hallucinations

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Abstract
Hypnotized subjects who report hallucinating a visual situation which would ordinarily elicit optokinetic nystagmus demonstrate nystagmus under these conditions. They and control subjects are unable to feign nystagmus in the waking state, either by imagining the situation or by direct efforts to simulate the eye movements. Thus an objective criterion is provided for the presence of visual hallucinations.