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One of the 76 alcoholic patients with hallucinations studied in an inpatient alcoholism service was a 24-year-old half-Hopi Pueblo Indian male, who developed a prolonged course of hallucinations after the death of his father. The author suggests that hallucinating experiences might be pathognomy-specific to the Hopi Indians' mourning process, to allow the release of their intensive feelings.
Winston W. Shen (Sun,) studied this question.