The Inventory of Psychotic-Like Anomalous Self-Experiences (IPASE): 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 4 studies designed to develop and validate a new scale to assess ASEs: the Inventory of Psychotic-Like Anomalous Self-Experiences (IPASE). In Study 1, an overinclusive 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 including disturbances in Cognition, Consciousness, Self-Awareness and Presence, Somatization, and Transitivism/Demarcation. The 5-factor structure was confirmed in Study 2, and the scale showed measurement invariance between sexes. IPASE scores were correlated with self-report and task measures of self-processing including self-concept clarity, self-consciousness, and self-esteem as well as measures of psychotic-like experiences. In Study 3, people with positive schizotypy had higher IPASE scores than a negative schizotypy and comparison group. In Study 4, people with schizophrenia had higher IPASE scores than healthy controls. Overall, the IPASE displayed strong psychometric qualities and is a brief alternative to resource-intensive phenomenological interviews in clinical, at-risk, and general population samples. (PsycINFO Database Record

Prevalence, dimensionality and clinical relevance of self‐disturbances and psychotic‐like experiences in Polish young adults: a latent class analysis approach.

“…The items are clusterd into five dimensions, representing qualitatively different aspects of self-disorder: 1) Cognition; 2) Self-Awareness and Presence; 3) Consciousness; 4) Somatization and 5) Demarcation/Transitivism. Recently, the scale has been used in studies on psychosis proneness (Cicero et al, 2017) and among schizophrenia spectrum patients (Cicero, Klaunig, Trask, & Neis, 2016). We used a Polish version of the IPASE (Gaweda et al, 2018c).…”

“…It is a demanding tool and thus not suitable for a screening assessment in large populations. However, since 2017 there is a new tool available for measuring SD in a self‐report manner – The Inventory of Psychotic‐Like Anomalous Self‐Experiences (IPASE) (Cicero, Neis, Klaunig, & Trask, ). A very recent study has confirmed construct validity of the IPASE with correlation coefficients with the EASE reaching about 0.9 (Nelson et al, ), which suggests the IPASE may be a satisfactory proxy or initial assessment of SD.…”

Terminology and assessment tools of psychosis: A systematic narrative review

“…They were considered potential preclinical experiences preceding impairing psychotic symptoms or psychotic disorders. Finally, a study evaluating measurement tools in the psychotic prodrome described PLE as including ‘magical ideation, perceptual aberration, schizotypal personality disorder, and dissociation’ …”

SU107. Disrupted Continuity of Subjective Time in the Milliseconds Range in the Self-disturbances of Schizophrenia: Convergence of Experimental, Phenomenological, and Predictive Coding Accounts

“…Whereas the experimental approach highlights prediction impairments, phenomenological analysis provides testable hypotheses regarding the interaction between retention (retained information) and protention (prediction) mechanisms. 3 Inventory of Psychotic-Like Anomalous Self-Experiences (IPASE), 4 and Self-Experience Lifetime Frequency (SELF) 5 scale has been conducted to identify phenomena associated with each scale. Results: Hundreds of items can be abbreviated to 22 phenomena.…”