Study type: Medical/biological study (experimental study)

No effects of mobile phone electromagnetic field on auditory brainstem response. med./bio.

Published in: Bioelectromagnetics 2010; 31 (1): 48-55

Aim of study (acc. to author)

To study the possible effects of the electromagnetic fields emitted by an GSM mobile phone on brainstem auditory processing in 17 healthy young adults.

Background/further details

Auditory brainstem response (ABR) was recorded first without a mobile phone at baseline, and then under real exposure and sham exposure in a counterbalanced order. During exposure/sham exposure, the mobile phone was placed directly on the ears, one ear at a time.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 902.4 MHz
Modulation type: pulsed
Exposure duration: 5 min sessions for 1 h
  • SAR: 1.14 W/kg average over mass (1 g)
  • SAR: 0.82 W/kg average over mass (10 g)

General information

experiments were conducted under three conditions: i) baseline = auditory stimuli only ii) auditory stimuli + mobile phone on the stimulated ear on iii) auditory stimuli + mobile phone on the stimulated ear off

Exposure 1

Main characteristics
Frequency 902.4 MHz
Type
Exposure duration 5 min sessions for 1 h
Modulation
Modulation type pulsed
Pulse width 0.58 µs
Repetition frequency 217 Hz
Additional info

additional auditory stimuli (clicks) with a rate of 10.3 HZ and a duration of 100 µs

Exposure setup
Exposure source
Setup tubal insert phone electrodes inserted into the ear canals of the subjects, three Ag-AgCl-electrodes (1 ground, 2 reference) attached to the forehaed, mobile phone placed directly on the ear; additional auditory stimuli conducted through thin flexible silicon tubes and polyurethane foam eartips wrapped in thin gold foil
Sham exposure A sham exposure was conducted.
Parameters
Measurand Value Type Method Mass Remarks
SAR 1.14 W/kg average over mass measured and calculated 1 g -
SAR 0.82 W/kg average over mass measured and calculated 10 g -

Reference articles

Exposed system:

Methods Endpoint/measurement parameters/methodology

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

Main outcome of study (acc. to author)

Auditory brainstem response waveforms showed no significant differences due to exposure, suggesting that short-term exposure to mobile phone electromagnetic fields did not affect the transmission of sensory stimuli from the cochlea up to the midbrain along the auditory nerve and brainstem auditory pathways.

Study character:

Study funded by

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