Abstract
The criteria for schizotypal personality disorder were developed on the basis of traits observed in biologic relatives of schizophrenic and borderline schizophrenic probands from the Danish adoption studies. In this review, the relationship between schizotypal personality disorder and the schizophrenic spectrum, affective disorders, and psychotic disorders is explored. A dimension of psychosis may overlap with the schizophrenia spectrum to yield chronic schizophrenia, with the affective disorders spectrum to yield psychotic affective disorder, or by itself lead to other psychotic disorders. Schizotypal personality disorder in this model is posited to represent schizophrenia spectrum disorder that does not overlap with psychosis, whereas nonpsychotic affective disorders represent the affective disorders that do not overlap with psychosis. Delusional disorder represents another psychotic disorder that is not specifically related to either schizophrenia or the affective disorders. Evidence suggests that the schizotypal personality disorder criteria, particularly those emphasizing the negative symptoms or deficit-like symptoms of this disorder, specifically identify a unique relationship to the schizophrenia spectrum.
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