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To investigate whether electromagnetic field emitted by digital cellular phones affects brain physiology.
|ばく露時間||continuous for 30 min|
|Distance between exposed object and exposure source||11 cm|
|ばく露装置の詳細||Subjects were sitting on a chair with their heads between to plates to ensure a well-defined position with respect to two matched planar antennas mounted on both sides of the head at a distance of 11 cm from the ear with their centres 4.2 cm vertically above the ear canal.|
|Additional information||The experiment consisted of three sessions one week apart involving right or left hemisphere and sham exposure scheduled according to a randomized, double-blind, cross-over design.|
Compared with the sham exposure, spectral power of the EEG in non-rapid eye movement sleep (REM sleep) was increased. The maximum rise occured in the 9.75-13.25 Hz band during the initial part of sleep. Unilateral radiation induced no hemispheric asymmetry of EEG power. The data show that exposure during waking modifies the EEG during subsequent sleep. Thus the changes of brain function induced by pulsed high-frequency electromagnetic fields outlast the radiation period.