Study type: Medical/biological study (experimental study)

Effect of a 902 MHz electromagnetic field emitted by mobile phones on human cognitive function: A replication study. med./bio.

Published in: Bioelectromagnetics 2003; 24 (4): 283-288

Aim of study (acc. to author)

The study was a replication and extension with methodological improvements to a previous study on effects of the electromagnetic field (EMF) emitted by a 902 MHz mobile phone on human cognitive functioning.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 902 MHz
Modulation type: pulsed
Exposure duration: continuous for 65 min
  • power: 0.25 W mean
  • SAR: 0.88 W/kg average over mass (1 g)
  • SAR: 1.2 W/kg peak value

General information

This study is an attempt to replicate earlier findings reported in the reference article.

Exposure 1

Main characteristics
Frequency 902 MHz
Type
Exposure duration continuous for 65 min
Modulation
Modulation type pulsed
Pulse width 577 µs
Repetition frequency 217 Hz
Additional info

Discontinuous transmission mode was not activated.

Exposure setup
Exposure source
Distance between exposed object and exposure source 4 cm
Setup A GSM telephone placed in a leather and vinyl case was mounted with an adjustable rubber head cap on the left side of the subject's head in the normal position of use. The antenna was located about 4 cm apart from the head, over the posterior part of the left hemisphere. The RF power was switched on and off via a data cable from a laptop.
Additional info Each subject performed the tasks twice on separate days with 24 ± 1 h between the testing sessions: one day with exposure and another day with sham exposure. Both the subjects and the experimenters were unaware of the exposure condition (double blind).
Parameters
Measurand Value Type Method Mass Remarks
power 0.25 W mean - - -
SAR 0.88 W/kg average over mass measured 1 g -
SAR 1.2 W/kg peak value measured - -

Reference articles

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Time of investigation:
  • during exposure

Main outcome of study (acc. to author)

The results indicate either that EMF has no effect on the cognitive functioning and the reported findings are just statistical noise, or that the EMF effect is so small that it can be detected on an behavioral level only occasionally. The results of the previous study were not confirmed.

Study character:

Study funded by

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