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Effects of prenatal exposure to a 50-Hz magnetic field on one-trial passive avoidance learning in 1-day-old chicks.

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Sun H, Che Y, Liu X, Zhou D, Miao Y, Ma Y. · 2010

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Magnetic field exposure during development impaired memory formation in stressed chicks, suggesting EMF may increase brain vulnerability.

Plain English Summary

Summary written for general audiences

Researchers exposed chick embryos to 50-Hz magnetic fields (the type from power lines) during development and tested their memory after hatching. Chicks exposed to magnetic fields showed impaired memory formation, but only when they were stressed during testing. This suggests that electromagnetic field exposure during development may make the brain more vulnerable to memory problems under stressful conditions.

Why This Matters

This study adds to growing evidence that electromagnetic field exposure during critical developmental windows can have lasting neurological effects. The 2 mT magnetic field used here is significantly stronger than typical household exposures (usually measured in microtesla), but the finding that effects only appeared under stress conditions is particularly concerning. It suggests that EMF exposure may not cause obvious problems under normal circumstances, but could make the developing brain more vulnerable when faced with additional challenges. What makes this research especially relevant is that it examines effects during embryonic development, when the nervous system is most susceptible to environmental influences. The reality is that we're conducting a massive experiment on developing brains with our increasingly electromagnetic environment, and studies like this suggest we should proceed with more caution.

Exposure Details

Magnetic Field
2 mG
Source/Device
50-Hz
Exposure Duration
60 min/day on embryonic days 12–18

Exposure Context

This study used 2 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: 2 mGExtreme Concern - 5 mGFCC Limit - 2,000 mGEffects observed in the Severe Concern rangeFCC limit is 1,000x 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

We investigated memory impairment in newly hatched chicks following in ovo exposure to a 50‐Hz magnetic field (MF) of 2 mT (60 min/day) on embryonic days 12–18.

Isolated and paired chicks were used to test the effect of stress during training, and memory retent...

Results showed that memory was intact at 10 min in both isolated and paired chicks with or without M...

Cite This Study
Sun H, Che Y, Liu X, Zhou D, Miao Y, Ma Y. (2010). Effects of prenatal exposure to a 50-Hz magnetic field on one-trial passive avoidance learning in 1-day-old chicks. Bioelectromagnetics. 31(2):150-155, 2010.
Show BibTeX
@article{h_2010_effects_of_prenatal_exposure_304,
  author = {Sun H and Che Y and Liu X and Zhou D and Miao Y and Ma Y.},
  title = {Effects of prenatal exposure to a 50-Hz magnetic field on one-trial passive avoidance learning in 1-day-old chicks.},
  year = {2010},
  doi = {10.1002/bem.20540},
  url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/bem.20540},
}
DOI: 10.1002/bem.20540

Cited By (14 papers)

View all 14 citing papers on Semantic Scholar

Quick Questions About This Study

Research suggests power line magnetic fields may impact developing brains. A 2010 study found chick embryos exposed to 50-Hz fields showed memory problems after hatching, but only under stressful conditions. This indicates prenatal electromagnetic exposure might increase brain vulnerability.
Electromagnetic field exposure during development may contribute to memory issues. Chicks exposed to 50-Hz magnetic fields in the womb showed impaired memory formation when stressed, while unexposed chicks maintained normal memory function under identical conditions.
Studies indicate 50-Hz magnetic fields may affect developing nervous systems. Research on chick embryos showed those exposed during development had memory formation problems when stressed, suggesting electromagnetic fields could make developing brains more vulnerable to cognitive issues.
Prenatal EMF exposure appears to increase brain vulnerability to stress-related memory problems. A study found chick embryos exposed to 50-Hz magnetic fields showed normal memory initially but failed to retain memories under stressful conditions after hatching.
Power line magnetic fields may increase memory vulnerability during development. Research showed chicks exposed to 50-Hz fields as embryos had impaired memory retention when isolated and stressed, while non-exposed chicks maintained normal memory function under stress.