Study type: Medical/biological study (experimental study)

Preattentive auditory information processing under exposure to the 902 MHz GSM mobile phone electromagnetic field: a mismatch negativity (MMN) study. med./bio.

Published in: Bioelectromagnetics 2009; 30 (3): 241-248

Aim of study (acc. to author)

To study the short-term effects of the GSM mobile phone electromagnetic fields on the mismatch negativity and associated brain processing.

Background/further details

The mismatch negativity is a sensitive indicator of pre-attentive auditory discrimination processing.
Mismatch negativity was elicited using a multifeature paradigm where four deviant types (duration, intensity, frequency, having a gap in the middle of a tone) appeared in a sequence of identical stimuli. 17 healthy volunteers (12 female) were investigated. Participants were watching a movie without sound and they were instructed not to pay attention to the auditory stimuli.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 902 MHz
Modulation type: pulsed
Exposure duration: 1 h in 6 minute blocks
  • SAR: 1.14 W/kg
  • SAR: 0.82 W/kg
  • SAR: 1.21 W/kg peak value

Exposure 1

Main characteristics
Frequency 902 MHz
Type
Exposure duration 1 h in 6 minute blocks
Modulation
Modulation type pulsed
Pulse width 0.58 µs
Repetition frequency 217 Hz
Exposure setup
Exposure source
Setup earplug-shaped earphones inserted in both ears; GSM phone attached to a headset placed on either ear in normal phoning position
Parameters
Measurand Value Type Method Mass Remarks
SAR 1.14 W/kg - measured 1 g -
SAR 0.82 W/kg - measured 10 g -
SAR 1.21 W/kg peak value measured - -

Reference articles

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

The mismatch negativity latency and amplitude showed no significant differences due to electromagnetic field exposure on either side.
No evidence was found that acute exposure to GSM mobile phone electromagnetic fields affects cortical auditory change detection processing reflected by the mismatch negativity. Pre-attentive change detection might not be affected by electromagnetic field exposure.

Study character:

Study funded by

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