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date: 26 February 2021

Abstract and Keywords

Paranoid and schizoid personality disorders are not currently proposed to be in the DSM-5 despite a long history in the clinical lexicon. This chapter reviews theoretical and empirical research on these conditions in this context. Several alternative hypotheses to the view that these constructs reflect valid syndromes are described. It is concluded that the validity of paranoid and schizoid personality disorders as unique constructs cannot be determined based on existing research and that further investigation is needed to determine their nosological status. Eliminating paranoid and schizoid as unique personality disorders in the DSM-5 would be consistent with existing evidence and the availability of multiple viable alternatives to syndromal hypotheses about paranoid and schizoid behavior.

Keywords: paranoid personality disorder, schizoid personality disorder, DSM, personality traits, schizotypy, personality assessment

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