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.
Jasper and Andrews (1938) observed that the tremor of the parts of the human body had the frequency of 8-12 c/s., mixing with that of 17-30 c/s., corresponding respectively with the ƒ¿ and ƒÀ waves of electroencephalogram. Schwab and Cobb (1939), studying in paralysis agitans, could not find any correlation with the brain wave. Lindqvist (1941) also studied in the relation between the tremor and a rhythm and found no constant relation between them.
In 1953 the author observed with a photoelectrical method a constant vibration of normal human hand. Rohracher (1955) found by using a highly efficient pickup that the body surface of warm-blooded animals is vibrating constantly and that this phenomenon cannot be observed in cold-blooded anima's. Since this specific vibration in warm-blooded animals was enhanced in the fevered condition and inhibited in hibernation. Rohracher supposed that it might be caused by the action of the autonomic nervous system which controls body temperature. On account of the finest amplitude of the vibration this phenomenon is called "microvibration" (MV). The present investigationn was undertaken to elucidate the meaning of MV and its originating mechanism more precisely. METHOD Cats and rabbits were used as experimental animals. Occasionally human, volunfied MV was recorded on the ink-writing oscillograph paper. In order to avoid noise,
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