8,700 Studies Reviewed. 87.0% Found Biological Effects. The Evidence is Clear.
Shield Your Body
Brain & Nervous System

Neuropsychological sequelae of 50 Hz magnetic fields

Bioeffects Seen

Authors not listed · 2001

Share:

Power line frequency magnetic fields at occupational levels impaired memory and executive function in healthy volunteers.

Plain English Summary

Summary written for general audiences

Australian researchers exposed 30 volunteers to 50 Hz magnetic fields at 28 microTesla (similar to occupational levels) for 50 minutes while testing cognitive function. Participants showed impaired word recall and reduced performance on executive function tasks requiring working memory and spatial processing.

Why This Matters

This controlled study provides concerning evidence that power line frequency magnetic fields can measurably impair cognitive function in healthy adults. The 28 microTesla exposure level used here is well within occupational exposure limits and comparable to what electrical workers, welders, and people living near power lines experience regularly. What makes this research particularly significant is the double-blind design and the specific cognitive deficits observed - impaired short-term memory and executive functioning are exactly the types of subtle effects that could accumulate over years of chronic exposure. The researchers' call for larger studies reflects the cautious nature of academic science, but the pattern of cognitive impairment they documented aligns with growing evidence that EMF exposure affects brain function even at levels regulators consider 'safe.'

Exposure Information

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

Specific exposure levels were not quantified in this study.

Cite This Study
Unknown (2001). Neuropsychological sequelae of 50 Hz magnetic fields.
Show BibTeX
@article{neuropsychological_sequelae_of_50_hz_magnetic_fields_ce1529,
  author = {Unknown},
  title = {Neuropsychological sequelae of 50 Hz magnetic fields},
  year = {2001},
  doi = {10.1080/095530000110038716},
  
}
DOI: 10.1080/095530000110038716PubMed: 11403713

Quick Questions About This Study

Yes, this study found that 50 Hz magnetic field exposure at 28 microTesla significantly impaired participants' ability to recall a 15-word list after interference, indicating reduced short-term memory for verbal information.
Two main tasks showed impairment: verbal recall of word lists and trail-making performance (alternating numbers and letters). These tasks involve short-term memory and executive functioning requiring coordination between brain regions.
Participants were exposed to 50 Hz magnetic fields for 50 minutes while seated at a desk. Cognitive testing occurred 20 minutes into the exposure period using a double-blind protocol.
Yes, 28 microTesla represents typical occupational exposure levels for electrical workers, welders, and people working near power equipment. It's also comparable to residential exposure near power lines.
This study suggests executive functioning and short-term memory are particularly vulnerable, especially tasks requiring parietal spatial processing coordinated by prefrontal brain regions and working memory systems.