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Brain & Nervous System

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

No Effects Found

Krause CM, Pesonen M, Haarala Björnberg C, Hämäläinen H. · 2007

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Mobile phone radiation showed only modest, inconsistent effects on brain waves during memory tasks, highlighting the variable nature of EMF neurological impacts.

Plain English Summary

Summary written for general audiences

Finnish researchers exposed 72 men to 902 MHz mobile phone radiation while they performed memory tasks, measuring brain wave patterns through EEG. The study found only modest, inconsistent effects on brain oscillations in the alpha frequency range, with no impact on actual memory performance. The researchers concluded that any brain wave changes from phone radiation appear to be subtle, variable, and difficult to replicate consistently.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 902 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 902 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

The study examined exposure from: 902 MHz Duration: continuous for about 54 or 80 min

Study Details

The aim of the current double‐blind studies was to partially replicate the studies by Krause et al. [2000a, b, 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 Björnberg C, Hämäläinen 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_2776,
  author = {Krause CM and Pesonen M and Haarala Björnberg C and Hämäläinen H. },
  title = {Effects of pulsed and continuous wave 902 MHz mobile phone exposure on brain oscillatory activity during cognitive processing.},
  year = {2007},
  doi = {10.1002/bem.20300},
  url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/bem.20300},
}
DOI: 10.1002/bem.20300

Cited By (82 papers)

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Quick Questions About This Study

Finnish researchers found that 902 MHz mobile phone radiation had only modest, inconsistent effects on brain oscillations in the alpha frequency range (8-12 Hz) during memory tasks. The brain wave changes were variable and difficult to replicate, with no impact on actual memory performance.
A 2007 study comparing pulsed and continuous wave 902 MHz exposure found no significant differences in cognitive performance between either radiation type. Both exposure patterns produced only subtle, inconsistent brain wave changes without affecting memory task results in 72 male participants.
Research shows that 902 MHz EMF exposure produces inconsistent EEG brain pattern changes that vary between individuals and studies. The effects on brain oscillatory responses appear subtle and difficult to replicate, suggesting no reliable pattern of brain wave alterations.
Studies of 902 MHz radiation effects on brain waves show poor reproducibility, with researchers reporting varying and unsystematic results. Finnish scientists concluded that EMF effects on brain oscillatory responses are difficult to replicate consistently for unknown reasons across different experiments.
Research demonstrates that 902 MHz phone radiation does not impair memory performance during cognitive testing. While subtle brain wave changes occurred in some participants, actual behavioral measures and memory task performance remained unaffected by the EMF exposure.