Study type: Medical/biological study (experimental study)

Electromagnetic field emitted by 902 MHz mobile phones shows no effects on children's cognitive function. med./bio.

Published in: Bioelectromagnetics 2005; 26 Suppl 7: S144-S150

Aim of study (acc. to author)

To study the potential effects of a standard 902 MHz global system for mobile communications (GSM) mobile phone on 10-14 years old children's cognitive function.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 902 MHz
Modulation type: pulsed
Exposure duration: continuous for approx. 50 min
  • SAR: 2.07 W/kg maximum
  • SAR: 1.44 W/kg average over mass (1 g)
  • SAR: 0.99 W/kg average over mass (10 g)

General information

The subjects, 32 children 10-14 years old, performed a series of cognitive tests while being exposed or sham-exposed.

Exposure 1

Main characteristics
Frequency 902 MHz
Type
Exposure duration continuous for approx. 50 min
Modulation
Modulation type pulsed
Pulse width 577 µs
Repetition frequency 217 Hz
Additional info

DTX mode was not activated.

Exposure setup
Exposure source
Setup A GSM telephone placed in a leather and vinyl case was mounted with an adjustable rubber EEG head cap on the left side of the subject's head in the normal position of use. The antenna was located over the left posterior temporal lobe. The RF power was switched on and off via a data cable from a laptop.
Additional info EMF exposure and sham exposure sessions in double-blind design were separated by 24 ± 1 h.
Parameters
Measurand Value Type Method Mass Remarks
SAR 2.07 W/kg maximum measured - -
SAR 1.44 W/kg average over mass measured 1 g -
SAR 0.99 W/kg average over mass measured 10 g -

Reference articles

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

The data showed no significant differences between the mobile phone off and on conditions in reaction times and accuracy.
The authors concluded that a standard mobile phone has no effect on children's cognitive function. The present findings challenge some earlier results (e.g. publication 3601 and publication 4728) suggesting that the electromagnetic field created by an active mobile phone would facilitate cognitive functioning.

Study character:

Study funded by

Comments on this article

Related articles