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  • Sensory perceptions that occur in the absence of any causal external stimulus. Hallucinations are a hallmark symptom of schizophrenia. Hallucinations can occur in all five sensory modalities, but auditory hallucinations are by far the most commonly reported. Auditory hallucinations occur in approximately 70% of patients with schizophrenia and can take several forms. Command hallucinations involve voices that tell the individual what he or she should think, feel, or do. Patients with schizophrenia often report voices that keep up a running commentary of the patient's behaviors or events the patients come across in their environment, or they report that voices are arguing. Visual hallucinations are less common but involve patients seeing imaginary people or creatures. Hallucinations can occur in healthy individuals who are under intense physiological ...

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