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Effect of whole-body exposure to the 848.5-MHz code division multiple access (CDMA) electromagnetic field on adult neurogenesis in the young, healthy rat brain.

No Effects Found

Kim HS, Kim YJ, Lee YH, Lee YS, Choi HD, Pack JK, Kim N, Ahn YH. · 2014

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Two weeks of cell phone radiation exposure at 2 W/kg didn't affect new brain cell formation in rats, but longer-term effects remain unknown.

Plain English Summary

Summary written for general audiences

Korean researchers exposed rats to cell phone radiation at levels similar to what phones emit (2 W/kg SAR) for up to 8 hours daily over two weeks, then examined whether this affected the brain's ability to generate new neurons. They found no significant changes in new brain cell formation in two key brain regions compared to unexposed rats, suggesting that short-term CDMA cell phone radiation exposure doesn't impair neurogenesis in healthy adult brains.

Why This Matters

This study addresses an important question about whether cell phone radiation affects the brain's ongoing ability to create new neurons, a process crucial for learning and memory throughout life. The 2 W/kg exposure level used here is at the upper limit of what current phones are allowed to emit, making these findings relevant to real-world exposure scenarios. However, we should interpret these negative results cautiously. The study used only 6 rats per group and examined just two weeks of exposure in young, healthy animals. The reality is that humans use phones for years or decades, often starting in childhood when the brain is still developing. While this research suggests no immediate impact on neurogenesis, it doesn't address whether longer-term exposure or exposure during critical developmental windows might produce different effects. The science demonstrates we need studies with longer exposure periods and larger sample sizes to fully understand EMF's impact on brain function.

Exposure Details

SAR
2 W/kg
Source/Device
848.5 MHz CDMA
Exposure Duration
1 or 8 h daily, 5 days per week, for 2 weeks

Exposure Context

This study used 2 W/kg for SAR (device absorption):

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 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern range (Building Biology)This level is 1 times the FCC limit
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 848.5 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 848.5 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

Whether exposure to the 848.5 MHz code division multiple access (CDMA) signal affects adult neurogenesis is unclear.

An animal experiment was performed with a reverberation chamber designed as a whole-body CDMA exposu...

We found no significant changes in the number of BrdU(+) cells in the SVZ or DG in the CDMA-exposed ...

Our results suggest that exposure to the CDMA signal does not affect neurogenesis in the adult rat brain, at least under our experimental conditions.

Cite This Study
Kim HS, Kim YJ, Lee YH, Lee YS, Choi HD, Pack JK, Kim N, Ahn YH. (2014). Effect of whole-body exposure to the 848.5-MHz code division multiple access (CDMA) electromagnetic field on adult neurogenesis in the young, healthy rat brain. Int J Radiat Biol. 2014 Dec 15:1-15.
Show BibTeX
@article{hs_2014_effect_of_wholebody_exposure_2769,
  author = {Kim HS and Kim YJ and Lee YH and Lee YS and Choi HD and Pack JK and Kim N and Ahn YH.},
  title = {Effect of whole-body exposure to the 848.5-MHz code division multiple access (CDMA) electromagnetic field on adult neurogenesis in the young, healthy rat brain.},
  year = {2014},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/25510255/},
}

Cited By (8 papers)

Quick Questions About This Study

No, CDMA 848.5 MHz radiation at 2 W/kg SAR doesn't affect brain cell growth. Korean researchers exposed rats to this specific cell phone frequency for up to 8 hours daily over two weeks and found no significant changes in new neuron formation in key brain regions compared to unexposed rats.
Eight hours of daily CDMA phone exposure doesn't damage neurogenesis in healthy adult brains. A 2014 study found no significant effects on new brain cell formation in rats exposed to 848.5 MHz CDMA radiation at phone-typical levels for two weeks straight.
Yes, 2 W/kg SAR CDMA radiation appears safe for adult brain development. Research showed no significant impact on neurogenesis in the subventricular zone or dentate gyrus brain regions after two weeks of exposure to 848.5 MHz CDMA signals at this specific absorption rate.
CDMA cell phone radiation doesn't affect hippocampus neurogenesis in rats. Scientists found no significant changes in new brain cell formation in the dentate gyrus region of the hippocampus after exposing healthy adult rats to 848.5 MHz CDMA radiation for two weeks.
Brain cells remain unaffected after two weeks of CDMA 848.5 MHz exposure. The study found no significant changes in the number of newly formed brain cells in two key neurogenesis regions compared to control groups, suggesting short-term CDMA exposure doesn't impair brain cell formation.