Objectives: The effects of Okada Purifying Therapy (OPT), a form of subtle energy (biofield) therapy that originated in Japan, were investigated. Electroencephalograms and the Profile of Mood States scores were measured using a crossover design during OPT and placebo sessions. Participants: Nineteen (19) healthy Japanese adults (mean age -standard deviation: 40.8 -11.2 years; 10 females) with no previous experience of biofield therapy participated in this study. Methods: Each session lasted 15 minutes. A single-blind, randomized design with a protocol consisting of regular cycles with eyes open followed by eyes closed was used. The power spectral value was calculated in h (4.0-7.9 Hz), a (8.0-12.9 Hz), and b (13.0-29.9 Hz) frequency ranges.
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