Phenomenological assessment of psychedelics induced experiences: Translation and validation of the German Challenging Experience Questionnaire (CEQ) and Ego-Dissolution Inventory (EDI)
PLoS ONE March 16, 2022 Katharina Dworatzyk, Tallulah Jansen, Timo Torsten Schmidt 19 citations
Two self-report questionnaires for assessing psychedelic experiences, the Challenging Experience Questionnaire and the Ego-Dissolution Inventory, were translated into German and evaluated in an online survey. The German version of the Challenging Experience Questionnaire showed acceptable fit to the original 7-factor structure, good internal consistency, and convergent validity with measures of anxiety and altered states of consciousness. The German Ego-Dissolution Inventory did not support the original single-factor structure; exploratory analysis suggested a 5-item version that measured ego-dissolution with high internal consistency and convergent validity. These validated translations help standardize assessment in psychological and neuroscientific research on altered states of consciousness.