Study type: Medical/biological study (experimental study)

EEG changes due to experimentally induced 3G mobile phone radiation. med./bio.

Published in: PLoS One 2015; 10 (6): e0129496

Aim of study (acc. to author)

The effects of an acute exposure of human subjects to a 3G mobile phone electromagnetic field on the EEG should be investigated.

Background/further details

31 young, female subjects were exposed on two different days within a 1-hour test session, respectively. On one day, the mobile phone was placed at the subject's ear and on the other day it was placed on the subject's chest (cardiac region). In each session, 15 minutes of sham exposure as pre-exposure condition, then 15 minutes of exposure and finally 15 minutes of sham exposure as post-exposure condition were recorded. Additionally, 15 minutes at the beginning or at the end of each session were randomly chosen for sham exposure without EEG recording to ensure blinding.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 1.9291–1.9397 GHz
Exposure duration: continuous for 15 minutes
  • SAR: 0.69 W/kg (for head, value according to manufacturer)
Exposure 2: 1.9291–1.9397 GHz
Exposure duration: continuous for 15 minutes
  • SAR: 0.69 W/kg (for head, value according to manufacturer)

Exposure 1

Main characteristics
Frequency 1.9291–1.9397 GHz
Type
Exposure duration continuous for 15 minutes
Additional info exposure of ear
Additional info phone was in dialing mode during exposure
Exposure setup
Exposure source
Chamber an electrically non-shielded room
Setup a dialing mobile phone was fixed to the left ear (comparable to a typical dialing position at an angle of approximately 45 degrees) with an elastic band; the experimenter entered the room after each 15-minutes (sham) exposure session and changed the phone
Sham exposure A sham exposure was conducted.
Additional info non-functioning mobile phone replicas were used for sham exposure
Parameters
Measurand Value Type Method Mass Remarks
SAR 0.69 W/kg - - partial body for head, value according to manufacturer

Exposure 2

Main characteristics
Frequency 1.9291–1.9397 GHz
Type
Exposure duration continuous for 15 minutes
Additional info exposure of chest
Additional info phone was in dialing mode during exposure
Exposure setup
Exposure source
Chamber an electrically non-shielded room
Setup a dialing mobile phone was fixed to the chest (adjacent to the left side of the sternum, bordering the sternoclavicular joint) with an elastic band; the experimenter entered the room after each 15-minutes (sham) exposure session and changed the phone
Sham exposure A sham exposure was conducted.
Additional info non-functioning mobile phone replicas were used for sham exposure
Parameters
Measurand Value Type Method Mass Remarks
SAR 0.69 W/kg - - partial body for head, value according to manufacturer

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 multilevel random regression analysis showed that exposure of the chest did not result in significant changes in the EEG compared to the sham exposures, probably due to the distance between the chest and the brain. However, the activity of all brain waves, except for delta waves, changed significantly due to exposure of the ear in comparison to the sham exposures, with stronger effects on the ipsilateral side of exposure.
The authors conclude that an acute exposure of human subjects to a 3G mobile phone electromagnetic field could have an effect on the EEG with an increased activity in the alpha wave, beta wave and gamma wave bands.

Study character:

Study funded by

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