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To investigate the effect of microwave irradiation modulated at low frequencies on the difference of EEG rhythms between brain hemispheres (inter-hemispheric asymmetry).
Two groups of healthy volunteers were exposed to 450 MHz microwave irradiation modulated at 14 Hz (n=13) and 40 Hz (n=15). All subjects completed the sessions with microwave and sham exposure during which the resting eyes closed EEG were continuously recorded.
|ばく露時間||1 min on - 1 min off - 10 cycles|
|Distance between exposed object and exposure source||10 cm|
|ばく露装置の詳細||rod antenna located at the left side of the head|
|Sham exposure||A sham exposure was conducted.|
The results showed an increase in the EEG energy from the left hemisphere caused by microwave exposure, except for the alpha rhythm at 14 Hz and the theta rhythm at 40 Hz modulation frequency. In the whole group of subjects no significant differences in inter-hemispheric asymmetry between exposure and sham exposure were found. Statistical analysis performed for individual subjects detected significant differences in asymmetry caused by exposure for two individuals at 14 Hz and five individuals at 40 Hz modulation frequency.
The results showed that 450 MHz microwave irradiation modulated at 14 and 40 Hz altered EEG asymmetry between hemispheres and increased EEG energy from the left side where the microwave power density was higher.