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To study the effects of low level microwave exposure on human EEG alpha and theta rhythms.
The experimental protocol consisted of one cycle of short term photic stimulation and ten cycles of the repetitive microwave stimulation.
|ばく露時間||intermittent, 60 s on/60 s off, for 20 min|
|Duty cycle||50 %|
|Repetition frequency||7 Hz|
|Distance between exposed object and exposure source||10 cm|
|チャンバの詳細||The subjects lay in a dark room in a relaxed position, eyes closed and ears blocked.|
|ばく露装置の詳細||The antenna was located at 10 cm from the skin on the left side of the head.|
|Sham exposure||A sham exposure was conducted.|
|Additional information||Only one EEG recording was performed for a subject per day. Test sessions were single blind, and the exposed and sham exposed subjects were randomly assigned.|
Low frequency modulated, low level microwave irradiation causes changes in the EEG rhythms' energy level. In the majority of individual cases, these changes are not statistically significant. The alterations caused by photic stimulation as well as microwave stimulation were more regular on the alpha rhythm. In the majority of cases, photic stimulation caused changes in the EEG energy level in the occipital region and microwave stimulation in the frontal region. The data demonstrated that microwave stimulation effects became apparent, starting from the third stimulation cycle. The data allowed to determine the following tendencies: 1) microwave stimulation causes an increase in the variability of the EEG energy level, 2) microwave stimulation causes changes in the frontal region in the majority of the cases, 3) repetitive exposures causes more remarkable changes in the EEG rhythms level than short term irradiation.
The physiological mechanisms underlying these effects are not well understood.