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Schizotypal personality is unique because not only is it considered a personality disorder, but in the Diagnostic and statistical manual of mental disorders 5th edition it's listed as a schizophrenia spectrum illness. This is because some consider it a prodrome of schizophrenia. Meaning that it precedes a diagnosis of schizophrenia. But not all people with schizotypal personality develop schizophrenia. it's termed schizotypal personality disorder in the diagnostic manual but it's based on a psychological construct of schizotypy. Schizotypy originally defined by the British psychologist Dr. Gordon Claridge, can be thought of as a proneness to psychosis.
