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Psychotic-Like Anomalous Self-Experience Paper

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Running Head: Inventory of Psychotic-Like Anomalous Self-Experiences

The Inventory of Psychotic-Like Anomalous Self-Experiences (IPLASE): Development and Validation

Abstract Anomalous self-experiences (ASEs) are among the first symptoms to appear in the prodrome, predict the development of psychosis over and above clinical symptoms, and are common in people with schizophrenia. Although there are well-validated phenomenological interviews for assessing ASEs, there are no self-report measures. The current research describes four studies designed to develop and validate a new scale to assess ASEs, the Inventory of Psychotic-Like Anomalous Self-Experience (IPLASE). In Study 1, an over-inclusive item pool was generated based on phenomenological descriptions of ASEs, and items were kept or discarded based on factor loadings in an exploratory factor analysis. Five factors were extracted …show more content…

The SPQ is a 74-item yes-no questionnaire with one subscale for each of the nine symptoms of schizotypal personality disorder (STPD) including ideas of reference, odd beliefs or magical thinking, unusual perceptual experiences, odd thinking and speech, suspiciousness or paranoid ideation, inappropriate or constricted affect, odd behavior, lack of close friends, and excessive social anxiety.
Dissociation. The Dissociative Processes Scale (DPS; Harrison & Watson, 1992), designed to measure relatively normal dissociative experiences as opposed to clinical dissociation (Watson, 2001) was used to measure dissociation. The DPS is a 33-item questionnaire containing subscales of Obliviousness, Detachment, and Imagination. Possible responses range from 1 strongly agree to 5 strongly disagree. The DPS has been found to have higher internal reliability and to load on a factor with other measures of dissociation (Chmielewski & Watson, 2008; Cicero & Kerns, 2010; Watson,

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