Study type: Medical/biological study (experimental study)

Comparison of the effects of continuous and pulsed mobile phone like RF exposure on the human EEG. med./bio.

Published in: Australas Phys Eng Sci Med 2007; 30 (4): 274-280

Aim of study (acc. to author)

The first aim of this study was to compare the possible effects arising from continuous wave radio frequency versus pulse modulation irradiation on human EEG. The second aim was to investigate the usefuleness of non-linear EEG analysis method.

Background/further details

Twelve healthy subjects (six females and six males) in the age of 10 to 32 years participated. They were seated comfortably with eyes closed while resting EEG was monitored.
An increase in alpha wave power as found in a previous study of Huber et.al. (publication 9345) should be replicated in this study.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 900 MHz
Modulation type: pulsed, CW
Exposure duration: intermittent, 3 x 15 min, see add. information
  • power: 2 W peak value (simulated)
  • SAR: 1.56 W/kg peak value (10 g) (at 276 mW peak input power?)

General information

The study followed a fully counterbalanced cross-over design, but analysis was only single blind due to ELF artefacts present during exposure.

Exposure 1

Main characteristics
Frequency 900 MHz
Type
Exposure duration intermittent, 3 x 15 min, see add. information
Modulation
Modulation type pulsed, CW
Additional info

GSM handset signal in DTX mode including 2, 8, 217, and 1736 Hz plus harmonics [Pedersen et al., 1999]

Exposure setup
Exposure source
  • monopole
  • crude approximation of a GSM handset
Chamber Sessions took place in a shielded room with the signal generator and amplifier located outside. Physiological recording equipment and a person monitoring it were also present.
Setup The exposure device was a model handset consisting of a metallic casing acting as ground and a monopole antenna. It was placed according to the IEEE standard 'touch' ear to mouth position for exposure of the left hemisphere.
Sham exposure A sham exposure was conducted.
Additional info Participants attended a 2-h recording session in which three 15-min periods (2 x 7.5 min) were randomly assigned to CW, PW, and sham exposure and were each enclosed by 7.5 min of pre- and post-exposure. After each 7.5-min period, there was a 1-min break in which subjects were instructed to open their eyes and stretch.
Parameters
Measurand Value Type Method Mass Remarks
power 2 W peak value - - simulated
SAR 1.56 W/kg peak value measured 10 g at 276 mW peak input power?

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)

No changes to alpha wave power were found for either using linear nor non-linear analysis methods, and thus the results of Huber et al. could not be confirmed.

Study character:

Study funded by

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