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Development of the Japanese version of the Ego-Dissolution Inventory (EDI)
Keisuke Kusudo1, Hideaki Tani1, Kengo Yonezawa1
1Department of Neuropsychiatry, Keio University School of Medicine, Tokyo, Japan.
Neuropsychopharmacology Reports
|February 6, 2024
Summary
Researchers developed a Japanese version of the Ego-Dissolution Inventory (EDI) to measure ego-dissolution experiences from psychedelic therapy. This new tool will aid in assessing these profound psychological effects in Japanese-speaking populations.
Area of Science:
- Psychopharmacology and Psychiatry
- Psychometric Instrument Development
Background:
- Psychedelics are gaining recognition as potential treatments for psychiatric disorders.
- Ego-dissolution, a diminished sense of self, is a key feature of psychedelic experiences.
- The Ego-Dissolution Inventory (EDI) measures this phenomenon, but a Japanese version was unavailable.
Purpose of the Study:
- To develop and validate a Japanese version of the Ego-Dissolution Inventory (EDI).
- To facilitate the assessment of ego-dissolution in Japanese-speaking individuals undergoing psychedelic therapy.
Main Methods:
- Translation and cultural adaptation followed ISPOR's Best Practice Guidelines.
- Independent translations by two Japanese psychiatrists, followed by consolidation and back-translation.
- Iterative refinement through continuous dialogue with the original EDI authors.
Main Results:
- A finalized, approved back-translated version of the EDI was achieved.
- The authorized Japanese version of the EDI is available in the Appendix.
Conclusions:
- The Japanese version of the EDI has been successfully developed.
- This instrument will support the evaluation of ego-dissolution in psychedelic-assisted therapy for Japanese speakers.
- Further studies are required to establish the reliability and validity of the translated EDI.
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