Study type: Medical/biological study (experimental study)

Integration of differences in EEG Analysis Reveals Changes in Human EEG Caused by Microwave. med./bio.

Published in: No authors listed, 2006 International Conference of the IEEE Engineering in Medicine and Biology Society, New York, NY, USA IEEE, 2006: 1597-1600, ISBN 9781424400324

Aim of study (acc. to author)

This study was focused on detection of the effect of microwave irradiation modulated with pulses of different frequencies on human EEG rhythm.

Background/further details

Seventy healthy vonlunteers were sham exposed and electromagnetic field exposed in four groups with following pulse frequencies: 7, 14, 21, 40, 70, 217, and 1000 Hz.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 450 MHz
Modulation type: pulsed
Exposure duration: intermittent, 1 min on/1 min off, for 10 x at each pulse rate

General information

The experiments were performed on four groups of subjects with different pulse rates. After recording the reference EEG for 10 minutes, exposure at the first pulse rate was applied, followed by one or two further pulse rates according to the considered group. During each test session, RF and sham exposure as well as the succession of pulse rates were randomly assigned.

Exposure 1

Main characteristics
Frequency 450 MHz
Type
Exposure duration intermittent, 1 min on/1 min off, for 10 x at each pulse rate
Modulation
Modulation type pulsed
Duty cycle 50 %
Repetition frequency 7 Hz
Additional info

group 2: 7, 14, and 21 Hz group 3: 40 and 70 Hz group 4: 217 and 1000 Hz

Exposure setup
Exposure source
Distance between exposed object and exposure source 10 cm
Setup The antenna was located 10 cm from the left side of the head.
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
power density 0.16 mW/cm² - estimated - -
SAR 0.35 W/kg - estimated - -

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)

Statistically significant changes occured in the EEG rhythm energy and dynamics between 12% and 30% of subjects. Theta wave was least affected. Most changes were observed in beta waves. Concerning brain region major changes were revealed in temporal-parietal brain region. Statistically significant changes in the EEG rhythms took place at the pulse frequencies higher or close to the EEG rhythm frequency.

Study character:

Study funded by

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