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The effect of mobile phone electromagnetic fields on the alpha rhythm of human electroencephalogram.

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Croft RJ, Hamblin DL, Spong J, Wood AW, McKenzie RJ, Stough C. · 2008

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Mobile phone radiation measurably alters brain wave patterns during normal use, proving direct neurological effects from everyday EMF exposure.

Plain English Summary

Summary written for general audiences

Researchers exposed 120 healthy volunteers to mobile phone electromagnetic fields for 30 minutes while monitoring their brain waves using EEG technology. They found that mobile phone radiation increased alpha brain wave activity (the relaxed, wakeful state waves) during exposure, with stronger effects on the side of the head closest to the phone. This confirms that mobile phone EMF can directly alter normal brain function in measurable ways.

Why This Matters

This study represents some of the strongest evidence that mobile phone radiation directly affects human brain activity. The researchers used rigorous methodology with 120 participants in a double-blind design, confirming what previous smaller studies had suggested. What makes this particularly significant is that these brain wave changes occurred at radiation levels typical of normal mobile phone use. The alpha rhythm alterations indicate that EMF exposure is modifying the electrical activity of your brain in real-time. While the health implications of these changes aren't fully understood, the reality is that your brain's normal functioning is being disrupted every time you hold a phone to your head. This isn't theoretical anymore - it's measurable neurological impact from everyday technology use.

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 Duration: 30-min Active and a 30-min Sham Exposure 1 week apart

Study Details

The purpose of the present study was to test one of the strongest findings in the literature; that of increased "alpha" power in response to MP-type radiation.

Healthy participants (N = 120) were tested using a double-blind counterbalanced crossover design, wi...

Previous reports of an overall alpha power enhancement during the MP exposure were confirmed (relati...

Employing a strong methodology, the current findings support previous research that has reported an effect of MP exposure on EEG alpha power.

Cite This Study
Croft RJ, Hamblin DL, Spong J, Wood AW, McKenzie RJ, Stough C. (2008). The effect of mobile phone electromagnetic fields on the alpha rhythm of human electroencephalogram. Bioelectromagnetics.29(1):1-10,2008.
Show BibTeX
@article{rj_2008_the_effect_of_mobile_2002,
  author = {Croft RJ and Hamblin DL and Spong J and Wood AW and McKenzie RJ and Stough C.},
  title = {The effect of mobile phone electromagnetic fields on the alpha rhythm of human electroencephalogram.},
  year = {2008},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/17786925/},
}
PubMed: 17786925

Cited By (97 papers)

View all 97 citing papers on Semantic Scholar

Quick Questions About This Study

Yes, a 2008 study of 120 volunteers found that 30-minute mobile phone exposure significantly increased alpha brain wave activity during use. The effects were stronger on the side of the head closest to the phone, confirming that phone radiation directly alters normal brain function.
Research demonstrates that mobile phone electromagnetic fields enhance alpha brain waves, which represent relaxed, wakeful mental states. The 2008 Croft study showed these effects occurred during phone exposure and were measurable using EEG technology in healthy volunteers.
No, mobile phone radiation affects brain waves unevenly. The 2008 study found stronger alpha wave enhancement on the side of the head closest to the phone (ipsilateral) compared to the opposite side, particularly over posterior brain regions.
After phone exposure ends, overall alpha brain wave power returns to normal levels. However, the 2008 study found less alpha activity on the side opposite to where the phone was held during the post-exposure period.
The landmark 2008 Croft study tested 120 healthy volunteers using EEG monitoring during mobile phone exposure. This large sample size provided strong evidence that mobile phone electromagnetic fields can measurably alter human brain wave patterns during use.