APA Dictionary of Psychology

a 1973 diagnostic study sponsored by the World Health Organization, involving psychiatrists in nine countries and a total of 1,119 patients assigned to a schizophrenic or nonschizophrenic category. The most discriminating of 13 symptoms were lack of insight, auditory hallucinations, verbal hallucinations, ideas of reference, and delusions of reference. The project used the Present State Examination. See also first-rank symptoms.