8,655 Studies Reviewed. 86.9% 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.

Whole Body / General

Environ Int 142:105808, 2020

No Effects Found

Authors not listed · 2020

Share:

Preadolescents with higher wireless screen exposure showed smaller volume in a brain region involved in learning and memory, warranting precautionary limits on children's wireless device use.

Plain English Summary

Summary written for general audiences

Researchers in the Netherlands studied 2,592 preadolescents aged 9-12 years to examine whether radiofrequency EMF exposure from mobile phones, tablets, laptops, and wireless environments affected brain structure. They found no association between overall RF-EMF exposure and brain volumes, but observed a smaller caudate volume (a brain structure involved in learning and memory) in children with higher exposure from screen-based wireless activities. The authors suggest this may reflect social or behavioral factors rather than direct RF-EMF effects, though further research is needed.

Cite This Study
Unknown (2020). Environ Int 142:105808, 2020.
Show BibTeX
@article{environ_int_142105808_2020_ce3168,
  author = {Unknown},
  title = {Environ Int 142:105808, 2020},
  year = {2020},
  doi = {10.1016/j.envint.2020.105808},
  
}
DOI: 10.1016/j.envint.2020.105808PubMed: 32554140

Quick Questions About This Study

The caudate nucleus, a brain region involved in learning, memory formation, and reward processing, showed reduced volume in preadolescents with higher RF-EMF exposure from screen-based wireless activities like mobile browsing, tablet use, and wireless laptop use. This finding emerged even though overall RF-EMF exposure showed no association with general brain volumes.
The study estimated an average whole-brain RF-EMF dose of 84.3 millijoules per kilogram per day (mJ/kg/day) from all sources combined. However, exposure varied significantly by brain region, with the temporal lobe receiving approximately 307.1 mJ/kg/day, more than three times the whole-brain average, due to its proximity to devices held near the head.
The study examined exposure from mobile phone calls, DECT cordless phone calls, mobile browsing and messaging, tablet use, laptop use with wireless connectivity, and far-field sources like cell towers. Phone calls delivered the highest localized doses to specific brain regions, particularly the temporal lobe, while screen-based wireless activities showed associations with structural brain differences despite lower exposure levels.
The researchers acknowledge two possibilities: direct biological effects from RF-EMF exposure on developing brain tissue, or indirect effects related to behavioral and social factors associated with screen use (such as reduced physical activity, disrupted sleep, or altered social interaction). They emphasize that regardless of mechanism, the observed association with brain structure warrants further investigation and precautionary approaches.
This study examined children aged 9-12 years, a period of ongoing brain development when neural circuits are still forming and refining. The preadolescent brain undergoes significant maturation in regions like the caudate nucleus, making this developmental window potentially vulnerable to environmental influences. The authors call for continued research across different developmental stages to understand long-term effects.