Study type: Medical/biological study (experimental study)

Perception of the electromagnetic field emitted by a mobile phone. med./bio.

Published in: Bioelectromagnetics 2008; 29 (2): 154-159

Aim of study (acc. to author)

In this in vivo study the possible existence of electrosensibility to mobile phone electromagnetic fields should be tested in a large sample of the general population.

Background/further details

Eighty-four young healthy adults (mean age: 24 +/- 6 years; 57 females, 27 males) participated. 100 trials each lasting 5 seconds were performed per experimental condition.
In the first task the participants should estimate whether the electromagnetic field was "on" or "off" and in the second task whether the electromagnetic field changed (from "on" to "off" and the other way round) or no electromagnetic field change occurred (always "on" or "off").

Endpoint

Exposure

Exposure Parameters
Exposure 1: 902 MHz
Modulation type: pulsed
Exposure duration: intermittent, 5 s on or off and a pause for reaction plus 1 s, repeated 100 times
on/off task
  • SAR: 1.21 W/kg maximum
  • SAR: 1.14 W/kg average over mass (1 g)
  • SAR: 0.82 W/kg average over mass (10 g)
Exposure 2: 902 MHz
Modulation type: pulsed
Exposure duration: intermittent, 2.5 s on/off or off/on and a pause for reaction plus 1 s, repeated 100 times
change task
  • SAR: 1.21 W/kg maximum
  • SAR: 1.14 W/kg average over mass (1 g)
  • SAR: 0.82 W/kg average over mass (10 g)

General information

There were 100 trials in each condition, and the four conditions other than the genuine on/off and the change condition had the same exposure types, either on or off. The order of the tasks and the conditions within each task were counterbalanced, and the trials were randomized in the genuine on/off and the change conditions and in effect double-blinded by computer. Participants could take a break between test blocks.

Exposure 1

Main characteristics
Frequency 902 MHz
Type
Exposure duration intermittent, 5 s on or off and a pause for reaction plus 1 s, repeated 100 times
Additional info on/off task
Modulation
Modulation type pulsed
Pulse width 0.58 ms
Repetition frequency 217 Hz
Exposure setup
Exposure source
Chamber Participants performed the tasks sitting 1.5 m away from a computer monitor in a soundproof room.
Setup The mobile phone was attached to a headset and placed on the ear (parallel to the medial plane in a normal use position) on the side usually used for mobile phone conversations or reported to be more sensitive to the EMF (67 right and 17 left).
Additional info The on/off task consisted of one genuine on/off condition, where the EMF was either on or off with the probability of 50% each, and two other conditions where the EMF was either always on or always off.
Parameters
Measurand Value Type Method Mass Remarks
SAR 1.21 W/kg maximum measured - -
SAR 1.14 W/kg average over mass measured 1 g -
SAR 0.82 W/kg average over mass measured 10 g -

Exposure 2

Main characteristics
Frequency 902 MHz
Type
Exposure duration intermittent, 2.5 s on/off or off/on and a pause for reaction plus 1 s, repeated 100 times
Additional info change task
Modulation
Modulation type pulsed
Pulse width 0.58 ms
Repetition frequency 217 Hz
Exposure setup
Exposure source
Additional info The change task consisted of one genuine change condition, where the EMF was either first on and then off or first off and then on with the probability of 50% each, and two constant conditions where the EMF was either always on or always off.
Parameters
Measurand Value Type Method Mass Remarks
SAR 1.21 W/kg maximum measured - -
SAR 1.14 W/kg average over mass measured 1 g -
SAR 0.82 W/kg average over mass measured 10 g -

Reference articles

  • Haarala C et al. (2007): Pulsed and continuous wave mobile phone exposure over left versus right hemisphere: effects on human cognitive function.

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

The results of right attribution whether electromagnetic field was "on", "off" or changing were not higher than expected by chance. Therefore, this study could not prove the existence of electrosensibility to mobile phone electromagnetic fields.

Study character:

Study funded by

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