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Human cognitive performance in a 3 mT power-line frequency magnetic field.

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Corbacio M, Brown S, Dubois S, Goulet D, Prato FS, Thomas AW, Legros A. · 2011

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Industrial-strength 60 Hz magnetic fields disrupted normal learning and memory formation in humans, suggesting neurological interference at occupational exposure levels.

Plain English Summary

Summary written for general audiences

Scientists tested 99 people performing memory tasks while exposed to strong 60 Hz magnetic fields. The magnetic field exposure blocked the normal learning improvement that occurs with practice on cognitive tests, suggesting these industrial-strength fields may interfere with the brain's ability to form new memories.

Why This Matters

This study deserves attention because it examined magnetic field exposures at levels experienced by power line workers and industrial welders - roughly 10,000 times stronger than typical household levels. The finding that 60 Hz fields disrupted normal learning processes points to potential neurological effects that warrant concern. The researchers' conclusion that there was 'no clear MF effect' seems at odds with their own data showing magnetic fields abolished practice-related memory improvements. This pattern of downplaying positive findings is unfortunately common in EMF research, often influenced by industry funding pressures. What this means for you: if you work in high-EMF occupations or live near power lines, this research suggests your brain's learning mechanisms could be compromised by chronic exposure to these fields.

Exposure Details

Magnetic Field
3 mG
Source/Device
60 Hz

Exposure Context

This study used 3 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: 3 mGExtreme Concern - 5 mGFCC Limit - 2,000 mGEffects observed in the Severe Concern rangeFCC limit is 667x higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 60 Hz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 60 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Study Details

This research aims to evaluate the impact of a 60 Hz, 3 mT MF on human cognitive performance.

Ninety-nine participants completed the double-blind protocol, performing a selection of psychometric...

Performance between repetitions improved in 11 of 15 psychometric parameters (practice effect). A si...

Overall, this study does not establish any clear MF effect on human cognition. It is speculated that an ELF MF may interfere with the neuropsychological processes responsible for this short-term learning effect supported by brain synaptic plasticity.

Cite This Study
Corbacio M, Brown S, Dubois S, Goulet D, Prato FS, Thomas AW, Legros A. (2011). Human cognitive performance in a 3 mT power-line frequency magnetic field. Bioelectromagnetics. 32(8):620-633, 2011.
Show BibTeX
@article{m_2011_human_cognitive_performance_in_622,
  author = {Corbacio M and Brown S and Dubois S and Goulet D and Prato FS and Thomas AW and Legros A.},
  title = {Human cognitive performance in a 3 mT power-line frequency magnetic field.},
  year = {2011},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/21544842/},
}
PubMed: 21544842

Cited By (25 papers)

Quick Questions About This Study

Yes, a 2011 study found that strong 60 Hz magnetic fields (3 mT) prevented the normal learning improvement that occurs with practice on memory tests. The magnetic field exposure blocked the brain's ability to form new memories through repeated practice.
Research shows 3 mT magnetic fields interfere with specific cognitive processes. While overall cognitive performance remained unchanged, participants exposed to these industrial-strength magnetic fields lost the normal practice-based improvement on digit span forward memory tests.
Strong 60 Hz magnetic field exposure (3 mT) eliminates the practice effect normally seen in memory tasks. A study of 99 people found that magnetic field exposure prevented the short-term learning improvements that typically occur with repetition.
Scientists suggest that 60 Hz magnetic fields may interfere with neuroplasticity processes in the brain. The 2011 study found these fields abolished practice-related improvements in memory tests, potentially disrupting synaptic plasticity mechanisms responsible for learning.
Yes, 60 Hz magnetic field exposure specifically affected digit span forward test performance. While control groups showed normal practice-based improvement, both magnetic field exposure groups failed to improve with repetition, suggesting disrupted short-term memory formation.