Study type: Medical/biological study (experimental study)

Scalp localization of human auditory cortical activity modified by GSM electromagnetic fields. med./bio.

Published in: Int J Radiat Biol 2006; 82 (7): 465-472

Aim of study (acc. to author)

To determine whether there is a localized effect of GSM microwaves by studying the auditory evoked potentials recorded at the scalp of nine healthy subjects and six epileptic patients.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 900 MHz
Modulation type: pulsed
Exposure duration: continuous for a part of the session lasting about 500 s
  • power: 0.25 W mean (simulator-controlled)
  • SAR: 1.4 W/kg average over mass (10 g)

Exposure 1

Main characteristics
Frequency 900 MHz
Type
Exposure duration continuous for a part of the session lasting about 500 s
Additional info Wiart J, Chaillou S, Altman Z, Drago S. 1999. Calculation of the power deposited in tissues close to a handset antenna using a non-uniform FDTD. In: Bersani F, editor. Electricity and magnetism in biology and medicine: 2nd World Congress for electricity and magnetism in biology & medicine, Bologna, Italy, 8 - 13 June 1997. New York: Plenum Press.
Modulation
Modulation type pulsed
Duty cycle 12.5 %
Repetition frequency 216.7 Hz
Exposure setup
Exposure source
Chamber The fully conscious subject was comfortably seated in a soundproofed Faraday screen room.
Setup The phone was placed close to the right ear on the electrodes helmet using a plastic structure without metal parts.
Sham exposure A sham exposure was conducted.
Additional info Each subject attended single-blind experimental and control sessions that took place over a period of several days. The experimental session consisted of two sequential recording phases, the first one without and the second one with maximum RF emission. The control session was also composed of the same two phases, but both of them without RF emission.
Parameters
Measurand Value Type Method Mass Remarks
power 0.25 W mean cf. remarks - simulator-controlled
SAR 1.4 W/kg average over mass measured and calculated 10 g -

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

The epileptic patients showed a lengthening of the scalp component N100 (100 ms latency) in the frontal area contralateral to the irradiation. For the healthy subjects, an amplitude increase of the P200 wave (200 ms latency) was identified in the frontal area.
The data indicate that radiofrequency fields emitted by mobile phones modify the auditory evoked potentials. Nevertheless, no direct link between these data and radiofrequency-induced damages in brain function was established.

Study character:

Study funded by

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