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

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Krause CM, Pesonen M, Haarala Bjornberg C, Hamalainen H. · 2007

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Exposure to EMF had modest effects on brain oscillatory responses in the alpha frequency range and no effects on behavioural measures.

Plain English Summary

Summary written for general audiences

Researchers recruited two groups of 36 male participants each, one performing an auditory memory task and the other a visual working memory task under six exposure conditions. The study aimed to partially replicate earlier work and investigate effects of mobile phone EMF on event-related desynchronisation/synchronisation EEG responses during cognitive processing. EMF exposure produced modest effects on alpha band oscillatory responses but no effects on behavioural measures. The EEG effects were varying, unsystematic, and inconsistent with previous reports.

Why This Matters

The authors concluded that EMF effects on brain oscillatory responses may be subtle, variable, and difficult to replicate for unknown reasons. They concluded that the variability and difficulty in replication remain unexplained.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 12 Hz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 12 HzPower lines50/60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study. The study examined exposure from: 8-12 Hz

Study Details

The aim of the current double-blind studies was to partially replicate the studies by Krause et al. [2000ab, 2004] and to further investigate the possible effects of electromagnetic fields (EMF) emitted by mobile phones (MP) on the event-related desynchronisation/synchronisation (ERD/ERS) EEG (electroencephalogram) responses during cognitive processing.

Two groups, both consisting of 36 male participants, were recruited. One group performed an auditory...

In line with our previous studies, we observed that the exposure to EMF had modest effects on brain ...

We conclude that the effects of EMF on brain oscillatory responses may be subtle, variable and difficult to replicate for unknown reasons

Cite This Study
Krause CM, Pesonen M, Haarala Bjornberg C, Hamalainen H. (2007). Effects of pulsed and continuous wave 902 MHz mobile phone exposure on brain oscillatory activity during cognitive processing. Bioelectromagnetics.28(4):296-308, 2007.
Show BibTeX
@article{cm_2007_effects_of_pulsed_and_2311,
  author = {Krause CM and Pesonen M and Haarala Bjornberg C and Hamalainen H.},
  title = {Effects of pulsed and continuous wave 902 MHz mobile phone exposure on brain oscillatory activity during cognitive processing.},
  year = {2007},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/17203478/},
}
PubMed: 17203478

Cited By (82 papers)

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Quick Questions About This Study

The study used a double-blind design with two groups of 36 male participants each, one performing an auditory memory task and the other a visual working memory task.
Participants were exposed to sham, continuous wave, and pulse-modulated EMF on both the left and right sides of the head.
EMF exposure had modest effects on brain oscillatory responses in the alpha frequency range but no effects on behavioural measures.
The EEG effects were varying, unsystematic, and inconsistent with previous reports.
They concluded that EMF effects on brain oscillatory responses may be subtle, variable, and difficult to replicate for unknown reasons.