• experimental
  
• epidemiological
  

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Medical/biological Study (experimental study)

Effects of pulsed and continuous wave 902 MHz mobile phone exposure on brain oscillatory activity during cognitive processing. med./biol.

PubMed Entry

Journal web site

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Aim of study (according to author)
The aim of the study was to partially replicate the data of previous studies (publication 10459, publication 5719, and publication 3600) and to further investigate the possible effects of electromagnetic fields emitted by mobile phones on the event related desynchronisation/synchronisation (ERD/ERS) EEG responses during cognitive processing.
Background/further details:
One group of 36 male subjects performed an auditory memory task and another group (also 36 male participants) performed a visual working memory task in six exposure conditions: sham exposure, continuous wave electromagnetic field exposure and pulse modulated electromagnetic field exposure during both left- and right-side exposure, while the EEG was recorded.
The same cognitive tasks as in the previous studies were used.

Endpoint

• effects on the neurological system: EEG (during a visual or auditory working memory task)

Exposure
General category: digital mobile phone, GSM

Field characteristics	Parameters
field 1: 902 MHz continuous wave (CW) exposure duration: continuous for about 54 or 80 min	power: 0.25 W mean value : 0.738 W/kg () SAR: 1.1 W/kg average over mass (1 g) SAR: 1.18 W/kg peak value
field 2: 902 MHz pulsed (PW) exposure duration: continuous for about 54 or 80 min	power: 0.25 W mean value SAR: 0.738 W/kg average over mass (10 g) SAR: 1.1 W/kg average over mass (1 g) SAR: 1.18 W/kg peak value

Exposed system:
human
partial body exposure: head (rigth and left side)

Methods
Endpoint/Measurement parameters/Methodology

• effects on the neurological system: EEG (event related desynchronisation/synchronisation (ERD/ERS))
• cognitive/behavioural endpoints: visual memory task (n-back task with 4 different memory load conditions: 0, 1, 2 and 3 items; (number of errors, reaction time); auditory memory task with words as stimuli (number of correct responses)
• others: EOG

Main outcome of study (according to author)
In line with the previous studies, the authors observed that the electromagnetic field exposure had modest effects on brain oscillatory responses in the alpha wave range (approximately 8-12 Hz) and had no effects on the behavioural measures. The only statistically significant effect arose during the auditory working memory task between the pulse modulated and continuous wave exposure conditions, such that greater alpha wave ERS and smaller alpha wave ERD responses were recorded during the pulse modulated exposure condition as compared to continuous wave exposure condition.The effects on the EEG ERD/ERS responses were, however, varying, unsystematic and inconsistent with previous reports.
The authors conclude that the effects of electromagnetic fields on brain oscillatory responses may be subtle, variable and difficult to replicate for unknown reasons.

(Study character: medical/biological study, experimental study, full/main study, replication/reproduction study, double-blind study)

Study funded by

• Forschungsgemeinschaft Funk e.V. (FGF) (Research Association for Radio Applications), Germany
• University of Helsinki, Finland

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