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Physiologically patterned weak magnetic fields applied over left frontal lobe increase acceptance of false statements as true.

Bioeffects Seen

Ross ML, Koren SA, Persinger MA. · 2008

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Weak magnetic fields at household appliance levels can double the likelihood of accepting false information as true.

Plain English Summary

Summary written for general audiences

Researchers exposed 50 people to weak magnetic fields over their left forehead while they processed true or false statements about word definitions. Those exposed to specific pulsed magnetic field patterns (25 Hz or burst-firing) were twice as likely to later accept false statements as true compared to control groups. This demonstrates that extremely weak magnetic fields can directly influence cognitive judgment and decision-making processes in the brain.

Why This Matters

This study reveals something profound about EMF exposure and brain function that goes far beyond the typical focus on heating effects or cancer risks. The magnetic field intensities used here (1-10 microTesla) are remarkably weak - comparable to what you might encounter from some household appliances or electrical wiring. Yet these fields demonstrably altered how participants processed information and made judgments about truth versus falsehood. What makes this particularly significant is that it shows EMF can influence higher-order cognitive processes like critical thinking and belief formation. The science demonstrates that our brains are far more sensitive to electromagnetic influences than regulatory agencies acknowledge, operating on the assumption that only thermal effects matter. This research suggests we need to reconsider how everyday EMF exposure might be subtly affecting our cognitive abilities and decision-making processes.

Exposure Details

Magnetic Field
0.001 to 0.01 mG
Source/Device
25 Hz, 50 Hz
Exposure Duration
20 ms on - 20 ms off, for 1 s & 10 ms on - 10 ms off, for 1 s

Exposure Context

This study used 0.001 to 0.01 mG for magnetic fields:

Building Biology guidelines are practitioner-based limits from real-world assessments. BioInitiative Report recommendations are based on peer-reviewed science. Check Your Exposure to compare your own measurements.

Where This Falls on the Concern Scale

Study Exposure Level in ContextStudy Exposure Level in ContextThis study: 0.001 to 0.01 mGExtreme Concern - 5 mGFCC Limit - 2,000 mGEffects observed in the No Concern rangeFCC limit is 2,000,000x higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 25 Hz - 50 Hz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 25 Hz - 50 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Study Details

To test whether a weak magnetic field pulsed over the left prefrontal brain region at the moment of accepting or refuting a statement could increase the likelihood of later accepting a false statement as true.

Fifty men and women were exposed to only one of four experimentally generated magnetic fields over t...

When the statements were presented again, the groups who had received the burst-firing (“limbic”) or...

Cite This Study
Ross ML, Koren SA, Persinger MA. (2008). Physiologically patterned weak magnetic fields applied over left frontal lobe increase acceptance of false statements as true. Electromagn Biol Med. 27(4):365-371, 2008.
Show BibTeX
@article{ml_2008_physiologically_patterned_weak_magnetic_290,
  author = {Ross ML and Koren SA and Persinger MA.},
  title = {Physiologically patterned weak magnetic fields applied over left frontal lobe increase acceptance of false statements as true.},
  year = {2008},
  doi = {10.1080/15368370802493545},
  url = {https://www.tandfonline.com/doi/abs/10.1080/15368370802493545},
}
DOI: 10.1080/15368370802493545

Cited By (12 papers)

Quick Questions About This Study

Yes, research shows weak magnetic fields can influence cognitive judgment. A 2008 study found people exposed to specific pulsed magnetic fields over their forehead were twice as likely to accept false statements as true, demonstrating direct effects on decision-making processes.
Yes, different EMF frequencies affect the brain in distinct ways. Research shows 25 Hz pulsed magnetic fields significantly impaired people's ability to distinguish truth from falsehood, while 50 Hz fields showed no such effect, indicating frequency-specific cognitive impacts.
Low frequency EMF can impair cognitive judgment according to scientific research. A controlled study demonstrated that 25 Hz magnetic fields applied to the forehead doubled people's likelihood of accepting false information as true, affecting critical thinking abilities.
Magnetic fields can directly alter brain decision-making by affecting neural processing. Research found that specific pulsed magnetic fields applied over the left forehead during information processing significantly increased people's acceptance of false statements as true compared to control conditions.
Pulsed EMF exposure can impair critical thinking and judgment. A 2008 study showed people exposed to 25 Hz pulsed magnetic fields were twice as likely to believe false statements, suggesting these frequencies may compromise your ability to evaluate information accurately.