6,486 Studies Reviewed. 85.2% of Original Studies Found Biological Effects. The Evidence is Clear.
Shield Your Body

Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.

Brain & Nervous System

Synchronization dynamics induced on pairs of neurons under applied weak alternating magnetic fields.

No Effects Found

Azanza MJ, del Moral A, Calvo AC, Pérez-Bruzón RN, Junquera C. · 2013

View Original Abstract
Share:

Weak magnetic fields at power line frequencies can force brain neurons to fire in artificial synchronization patterns.

Plain English Summary

Summary written for general audiences

Spanish researchers exposed pairs of snail neurons to weak 50 Hz magnetic fields (the same frequency as household electricity) to study how these fields affect brain cell communication. They found that the magnetic fields could force neurons to fire in sync with each other, creating artificial patterns of brain activity that matched the timing of the field exposure. This suggests that extremely low frequency magnetic fields can directly influence how brain cells communicate with each other.

Why This Matters

This research provides direct evidence that ELF magnetic fields at power line frequencies can alter fundamental brain cell communication patterns. The fact that 50 Hz fields could synchronize neuron firing is particularly significant because this is the exact frequency of electrical power systems in most of the world (60 Hz in North America). While this study used snail neurons, the basic mechanisms of neural communication are remarkably similar across species. The magnetic field strength used (0.02-15 units) falls within ranges that people can experience near power lines and electrical equipment. What makes this study especially important is that it demonstrates EMFs don't just heat tissue or cause random cellular stress - they can create specific, patterned changes in how brain cells talk to each other. This adds to growing evidence that our brains may be more sensitive to electromagnetic interference than previously understood.

Exposure Details

Magnetic Field
0.02,15 mT
Source/Device
50 Hz
Exposure Duration
15 s with 1 min intervals

Exposure Context

This study used 0.02,15 mT 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: 0.02,15 mTExtreme Concern - 5 mGFCC Limit - 2,000 mGEffects observed in the Extreme Concern range (Building Biology)FCC limit is 10 times higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 50 Hz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 50 HzCell phones~1 GHzWiFi2.4 GHz5G mm28 GHzLogarithmic scale

Study Details

To examine the effect of weak alternating magnetic fields on the synchronization dynamics of pairs of snail neurons

We have compared the AMFS patterns of discharge with: i) the synaptic activity promoted by glutamate...

AMFS activity reveals several specific features: i) a tight coincidence in time of the pattern and f...

Cite This Study
Azanza MJ, del Moral A, Calvo AC, Pérez-Bruzón RN, Junquera C. (2013). Synchronization dynamics induced on pairs of neurons under applied weak alternating magnetic fields. Comp Biochem Physiol A Mol Integr Physiol. 166(4):603-618, 2013.
Show BibTeX
@article{mj_2013_synchronization_dynamics_induced_on_2823,
  author = {Azanza MJ and del Moral A and Calvo AC and Pérez-Bruzón RN and Junquera C. },
  title = {Synchronization dynamics induced on pairs of neurons under applied weak alternating magnetic fields.},
  year = {2013},
  
  url = {https://www.sciencedirect.com/science/article/pii/S1095643313002250},
}

Quick Questions About This Study

Yes, Spanish researchers found that 50 Hz magnetic fields (the same frequency as household electricity) can force pairs of snail neurons to fire in perfect synchronization. This artificial timing matched the magnetic field exposure, showing that power line frequencies can directly influence how brain cells communicate with each other.
Research on snail neurons shows that weak 50 Hz magnetic fields can create artificial patterns of brain cell activity. The neurons fired in tight time coordination with the magnetic field frequency, suggesting that extremely low frequency fields from power lines can alter natural brain cell communication patterns.
When exposed to 50 Hz magnetic fields (household electricity frequency), neuron pairs showed forced synchronization and biphasic responses - meaning periods of increased activity followed by inhibition. These artificial firing patterns occurred only during field exposure and depended on the magnetic field's intensity.
Yes, the 2013 Spanish study found that higher intensity magnetic fields could actually desynchronize neuron pairs that were either naturally synchronized or artificially synchronized by weaker fields. This shows that magnetic field effects on brain cells depend heavily on the field strength used.
The researchers found that 4.7% of snail neurons contained gap-like junctions with connexin 26 proteins, but these electrical connections between cells did not respond to 50 Hz magnetic fields. The synchronization effects occurred through different cellular mechanisms than these direct electrical pathways.