Study type: Medical/biological study (experimental study)

Effect of modulated microwave radiation on human EEG asymmetry. med./bio.

Published in: Environmentalist 2009; 29 (2): 210-214

Aim of study (acc. to author)

To investigate the effect of microwave irradiation modulated at low frequencies on the difference of EEG rhythms between brain hemispheres (inter-hemispheric asymmetry).

Background/further details

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.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 450 MHz
Modulation type: pulsed
Exposure duration: 1 min on - 1 min off - 10 cycles

Exposure 1

Main characteristics
Frequency 450 MHz
Type
Exposure duration 1 min on - 1 min off - 10 cycles
Modulation
Modulation type pulsed
Duty cycle 50 %
Additional info

modulation frequency: 14 Hz or 40 Hz

Exposure setup
Exposure source
Distance between exposed object and exposure source 10 cm
Setup rod antenna located at the left side of the head
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
power 1 W - - - -
power density 0.16 mW/cm² - measured - at the left side of the head
SAR 0.303 W/kg peak value calculated 1 g -

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Investigated organ system:
Time of investigation:
  • during exposure

Main outcome of study (acc. to author)

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.

Study character:

Study funded by

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