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This study focused on the comparison of 450 MHz microwave exposure effect at different frequency modulations on human EEG.
Thirteen healthy subjects (4 male and 9 female) in the age of 21-30 years participated. During the experiments the participants were lying in a relaxed position in dark room, eyes closed and ears blocked.
Frequency modulations were selected from the EEG frequency spectrum: 7, 14, and 21 Hz.
|ばく露時間||intermittent, 1 min off/1 min on, for 10 min per frequency|
|Duty cycle||50 %|
pulse rates of 7, 14, and 21 Hz
|Distance between exposed object and exposure source||10 cm|
|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||During each 30-min test session (one only per day), the exposure conditions and the succession of the modulation frequencies were double-blind and randomly assigned by a computer. All subjects passed the exposure and sham protocols twice.|
The microwave exposure at 14 Hz and 21 Hz frequency modulation caused significant increase in beta1 waves and alpha waves. It can be noticed that the microwave exposure caused significant effect when the frequency modulation was higher or comparable with EEG rhythm frequency.