Abstract
The purposes of the present study were to develop a Japanese version of the Schizotypal Personality Questionnaire (SPG) which comprehensively assesses schizotypy, and to investigate the multi-dimensionality of schizotypy. College students (N = 558) completed the Schizotypal Personality Questionnaire. The internal consistency of the scale and its test-retest reliability were sufficiently high (α=.63〜.86; r = .76 〜.86, respectively). The Schizotypal Personality Questionnaire also was found to have high convergent validity, in that the correlation coefficients between it and the Schizotypal Personality Scale were moderate. When confirmatory factor analysis was conducted with the sample to compare 7 possible models, a 3-factor model of disorganization provided the best fit. Furthermore, cluster analysis revealed that participants could be categorized into 4 clusters, including a "high schizotypy" cluster, a "positive schizotypy" cluster, a "negative schizotypy" cluster, and a "low schizotypy" cluster. This suggests that each factor is different from the others. Although these results do not confirm that the difference in the factor structures is a result of the continuity between schizotypy and schizophrenia, the 3-factor structure of schizotypy might provide some insights into the symptoms of schizophrenia.
