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Brain & Nervous System216 citations

Acute mobile phone operation affects neural function in humans.

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Croft R, Chandler J, Burgess A, Barry R, Williams J, Clarke A. · 2002

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Mobile phone use measurably alters brain wave patterns within 20 minutes, with effects intensifying over time during typical phone calls.

Plain English Summary

Summary written for general audiences

Australian researchers measured brain activity in 24 people while they used active mobile phones for three 20-minute sessions. They found that phone use changed brain wave patterns in multiple ways - decreasing slow waves on the right side of the brain, increasing faster waves in the back, and altering how the brain responds to sounds. The changes got stronger the longer people were exposed, suggesting that phone radiation directly affects how our brains function.

Why This Matters

This study provides compelling evidence that mobile phone radiation doesn't just heat tissue - it actively alters brain function in measurable ways. The researchers used EEG technology to track brain waves in real time, finding multiple changes that intensified with longer exposure periods. What makes this particularly significant is that these effects occurred during typical phone use, not from extreme laboratory exposures. The study helps explain why earlier EMF research produced conflicting results - the effects are time-dependent, meaning shorter studies might miss them entirely. The reality is that your brain responds to mobile phone radiation within minutes, with changes becoming more pronounced the longer you're exposed. This research adds to a growing body of evidence showing that EMF exposure affects neural function, challenging the industry position that non-thermal effects don't exist.

Exposure Information

A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 900 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 900 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Specific exposure levels were not quantified in this study. The study examined exposure from: 900 MHz Duration: continuous for 3 x 20 min

Study Details

The present study suggests that this conflict may be due to methodological differences such as exposure durations, and tests whether exposure to an active MP affects EEG as a function of time.

Twenty-four subjects participated in a single-blind fully counterbalanced cross-over design, where b...

MP exposure altered resting EEG, decreasing 1-4 Hz activity (right hemisphere sites), and increasing...

Active MPs affect neural function in humans and do so as a function of exposure duration. The temporal nature of this effect may contribute to the lack of consistent results reported in the literature.

Cite This Study
Croft R, Chandler J, Burgess A, Barry R, Williams J, Clarke A. (2002). Acute mobile phone operation affects neural function in humans. Clin Neurophysiol 113(10):1623, 2002.
Show BibTeX
@article{r_2002_acute_mobile_phone_operation_2001,
  author = {Croft R and Chandler J and Burgess A and Barry R and Williams J and Clarke A.},
  title = {Acute mobile phone operation affects neural function in humans.},
  year = {2002},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/12350439/},
}
PubMed: 12350439

Cited By (216 papers)

View all 216 citing papers on Semantic Scholar

Quick Questions About This Study

Yes, Australian researchers found that just 20 minutes of 900 MHz cell phone use altered brain wave patterns in 24 people. The study showed decreased slow waves on the brain's right side and increased faster waves in the back, with effects becoming stronger with longer exposure.
Yes, this 2002 study found that 900 MHz mobile phone radiation altered how the brain responds to sounds. Researchers measured changes in early phase-locked neural responses, showing that phone use affects the brain's normal sound processing patterns during exposure.
Yes, the Croft study demonstrated that brain wave alterations increased as a function of exposure duration. The longer people used their 900 MHz phones during the three 20-minute sessions, the stronger the changes became in their brain activity patterns.
According to this research, the temporal nature of brain effects may explain inconsistent study results. The 2002 Australian study found that 900 MHz phone radiation affects neural function in a time-dependent way, suggesting exposure duration critically impacts findings.
This study found that 900 MHz phone use decreased 1-4 Hz slow wave activity in the right hemisphere and increased 8-12 Hz activity in posterior brain regions. The research also showed changes in 4-8 Hz, 12-30 Hz, and 30-45 Hz frequency bands.