Study type: Medical/biological study (experimental study)

Non-Thermal Effect of Microwave Radiation on Human Brain med./bio.

Published in: Environmentalist 2005; 25 (2-4): 187-194

Aim of study (acc. to author)

This study focused on the comparison of 450 MHz microwave exposure effect at different frequency modulations on human EEG.

Background/further details

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.



Exposure Parameters
Exposure 1: 450 MHz
Modulation type: pulsed
Exposure duration: intermittent, 1 min off/1 min on, for 10 min per frequency

Exposure 1

Main characteristics
Frequency 450 MHz
Exposure duration intermittent, 1 min off/1 min on, for 10 min per frequency
Modulation type pulsed
Duty cycle 50 %
Additional info

pulse rates of 7, 14, and 21 Hz

Exposure setup
Exposure source
Distance between exposed object and exposure source 10 cm
Setup 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 info 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.
Measurand Value Type Method Mass Remarks
power density 0.16 mW/cm² - measured - at the skin
SAR 0.0095 W/kg - calculated - in the brain

Reference articles

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

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.

Study character:

Study funded by

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