Schizotypal Personality Questionnaire (SPQ)

The SPQ (Raine, 1991) is a 74-item self-report questionnaire designed to measure assessing symptoms related to schizotypy. Though it was originally designed and tested for its ability to discriminate schizotypal personality disorder, the SPQ has evolved as a dimensional measure of schizotypal traits relevant to individuals with SCZ. These traits reflect biological, cognitive, and social dimensions of schizotypal traits. The SPQ yields nine subscales, including ideas of reference, suspiciousness, magical thinking, unusual perceptions, no close friends, constricted affect, social anxiety, eccentric behavior, and odd speech. Each “yes” response is counted as one point and 9 subscale scores are computed as the total score for all items associated with each subscale. Subscale scores were used to represent SCZ-relevant symptom nodes in the network analysis.