Study type: Medical/biological study (experimental study)

The Effects of 884 MHz GSM Wireless Communication Signals on Spatial Memory Performance: An Experimental Provocation Study. med./bio.

Published in: PIERS Proceedings, Prague, Czech Republic The Electromagnetics Academy, 2007, ISBN 9781934142028: 526-529

Aim of study (acc. to author)

to investigate whether exposure to GSM wireless communication signals has any direct impact on the spatial memory performance.

Background/further details

The male and female probands (n=55) aged 18 to 45 were daily mobile phone users and with or without symptoms they associated with mobile phone use. The test persons were either exposed or sham exposed. The probands passed seven trials in a virtual spatial navigation task (modeled after the Morris Water Task) in which the participant has to navigate to a platform in a pool.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 884 MHz
Modulation type: pulsed
Exposure duration: continuous for 3 h
temporal change between non-DTX and DTX mode
  • SAR: 0.23 W/kg spatial average (10 g) (average interval duration of 5 s (DTX mode))
  • SAR: 1.95 W/kg peak value (10 g) (average interval duration of 11 s)
  • SAR: 1.4 W/kg spatial average (10 g) (time averaged result of the above values)

General information

55 mobile phone users divided into two groups: i) participants with symptoms (headache, dizziness, difficulties in concentrating) ii) participants with none of the above symptoms

Exposure 1

Main characteristics
Frequency 884 MHz
Type
Exposure duration continuous for 3 h
Additional info temporal change between non-DTX and DTX mode
Modulation
Modulation type pulsed
Additional info

exposure simulated the modulation of the GSM frame structures, but not the higher frequencies resulting from random code modulation

Exposure setup
Exposure source
Setup antenna exposed simultaneously all possible exposure foot points of mobile phones and the deeper brain structures
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
SAR 0.23 W/kg spatial average - 10 g average interval duration of 5 s (DTX mode)
SAR 1.95 W/kg peak value - 10 g average interval duration of 11 s
SAR 1.4 W/kg spatial average - 10 g time averaged result of the above values

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 group with symptoms improved their performance under exposure to GSM signals, while no such an effect was observed for the group without symptoms. Exposure to GSM signal had no significant effect in both groups on learning in the trials 1 to 7.

Study character:

Study funded by

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