Study type: Medical/biological study (experimental study)

No effects of mobile phone use on cortical auditory change-detection in children: an ERP study. med./bio.

Published in: Bioelectromagnetics 2010; 31 (3): 191-199

Aim of study (acc. to author)

To study whether there are any short-term electromagnetic field effects on the auditory sensory memory of children by comparing the mismatch negativity responses in different electromagnetic field conditions.

Background/further details

17 healthy children (13 females, aged 11-12 years) participated. A recently developed multi-feature paradigm was used that allows to determine the neural change-detection profile consisting of several different types of acoustic changes.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 902 MHz
Modulation type: pulsed
Exposure duration: 6 min blocks, 3 blocks on one ear - then 3 blocks on the other ear; each three block sequence consisted of one block EMF off, 2 blocks EMF on
  • power: 0.25 W mean
  • SAR: 1.14 W/kg average over mass (1 g)
  • SAR: 0.82 W/kg average over mass (10 g)
  • SAR: 1.21 W/kg peak value

Exposure 1

Main characteristics
Frequency 902 MHz
Type
Exposure duration 6 min blocks, 3 blocks on one ear - then 3 blocks on the other ear; each three block sequence consisted of one block EMF off, 2 blocks EMF on
Modulation
Modulation type pulsed
Pulse width 0.58 µs
Repetition frequency 217 Hz
Exposure setup
Exposure source
Setup mobile phone placed on the ear, parallel to the medial plane, attached to a headset
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
power 0.25 W mean measured - -
SAR 1.14 W/kg average over mass measured 1 g -
SAR 0.82 W/kg average over mass measured 10 g -
SAR 1.21 W/kg peak value measured - -

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

The data showed that the electromagnetic field emitted by a GSM mobile phone does not affect the cognitive processes, reflected by the responses to the standard tone (P100 event-related potential, N200 event-related potential, and the change-specific mismatch negativity and P3a responses.
Furthermore, the recently developed multi-feature paradigm was shown to be well suited for studies of perception accuracy and sensory memory in children. However, it should be noted that the present study only had sufficient statistical power to detect a large effect size.

Study character:

Study funded by

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