Study type: Medical/biological study (experimental study)

Effects of twenty-minute 3G mobile phone irradiation on event related potential components and early gamma synchronization in auditory oddball paradigm. med./bio.

Published in: Neuroscience 2008; 157 (2): 453-462

Aim of study (acc. to author)

To investigate the potential effects of 20 min irradiation from an UMTS-mobile phone on event related potentials evoked by standard and target tones in an auditory oddball paradigm.

Background/further details

In two seperate sessions, 29 healthy students were exposed and sham-exposed between two recording blocks of an oddball paradigm. Before and after exposure participants were presented with a random series of 50 ms tone burst at a mean repetition rate of 1500 ms. The subjects task was to count the appearance of targets (=deviant tone burst).

Endpoint

Exposure

Exposure Parameters
Exposure 1:
  • unspecified
Modulation type: pulsed
Exposure duration: continuous for 20 min
  • SAR: 0.39 W/kg maximum (1 g)
  • SAR: 1.75 W/kg maximum (1 g)
  • SAR: 3.75 W/kg maximum (partial body) (at the skin level of the outer ear)

Exposure 1

Main characteristics
Frequency
  • unspecified
Type
Exposure duration continuous for 20 min
Modulation
Modulation type pulsed
Repetition frequency 1,500 Hz
Exposure setup
Exposure source
Setup mobile phone connected to an external patch antenna which was mounted on a plastic head set; as for applicator a 0.5 mm thick single sided round dual band patch antenna with a diameter of 31 mm was used
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
SAR 0.39 W/kg maximum calculated 1 g -
SAR 1.75 W/kg maximum measured 1 g -
SAR 3.75 W/kg maximum estimated partial body at the skin level of the outer ear

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

The analysis of the percentage score of correctly counted target stimuli and the auditory thresholds before and after exposure and sham exposure indicated no effect of electromagnetic fields on task performance. Standard stimuli evoked the N100, N200 and P200 component and targets evoked the P300 response. No significant effects of electromagnetic field exposure on the amplitude and latency of the event related potential components were found. Target stimuli evoked stronger gamma wave-frequency band response than standards, however no effect of electromagnetic fields on the magnitude of gamma wave acitivity was found.

Study character:

Study funded by

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