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Brain & Nervous System

Effects of early-onset radiofrequency electromagnetic field exposure (GSM 900 MHz) on behavior and memory in rats.

No Effects Found

Klose M, Grote K, Spathmann O, Streckert J, Clemens M, Hansen VW, Lerchl A. · 2014

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Long-term cell phone radiation exposure during brain development showed no cognitive effects in rats, even at levels five times higher than phone safety limits.

Plain English Summary

Summary written for general audiences

German researchers exposed young rats to cell phone radiation (900 MHz) for nearly their entire lives, testing their learning and memory abilities at different ages. Despite using radiation levels up to 10 W/kg (much higher than typical phone exposure), they found no significant effects on behavior, memory, or brain development. This long-term study suggests that chronic cell phone radiation exposure starting in early development may not impair cognitive function.

Why This Matters

This study stands out for its exceptional duration and comprehensive approach, following rats from just two weeks old through 19 months while testing multiple cognitive functions. The exposure levels ranged from 0.7 to 10 W/kg, with the highest level being five times greater than current safety limits for phones (2 W/kg SAR). What makes this research particularly relevant is that it examined the most vulnerable period of brain development, when neural pathways are still forming. The science demonstrates that even prolonged exposure during this critical window didn't produce measurable cognitive deficits. However, you should consider this alongside the growing body of research showing other biological effects from RF exposure, including oxidative stress and cellular changes that may not translate directly into behavioral outcomes in animal studies.

Exposure Details

SAR
0.7,2.5 and 10 W/kg
Source/Device
900 MHz
Exposure Duration
2 h per day, 5 days per week

Exposure Context

This study used 0.7,2.5 and 10 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: 0.7,2.5 and 10 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern range (Building Biology)FCC limit is 2 times higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 900 MHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 900 MHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

To investigate possible long-term effects of electromagnetic fields (GSM 900 MHz) on the developing rat brain.

Female Wistar rats, from an age of 14 days to 19 months, were exposed in the head region for 2 h per...

In these tests, no profound differences could be identified between the groups. Only presenile rats ...

The results of this study do not indicate harmful effects of long-term RF-EMF exposure even when begun at an early age on subsequent development, learning skills and behavior in rats, even at relatively high SAR values.

Cite This Study
Klose M, Grote K, Spathmann O, Streckert J, Clemens M, Hansen VW, Lerchl A. (2014). Effects of early-onset radiofrequency electromagnetic field exposure (GSM 900 MHz) on behavior and memory in rats. Radiat Res. 182(4):435-447, 2014.
Show BibTeX
@article{m_2014_effects_of_earlyonset_radiofrequency_2775,
  author = {Klose M and Grote K and Spathmann O and Streckert J and Clemens M and Hansen VW and Lerchl A. },
  title = {Effects of early-onset radiofrequency electromagnetic field exposure (GSM 900 MHz) on behavior and memory in rats.},
  year = {2014},
  
  url = {https://meridian.allenpress.com/radiation-research/article-abstract/182/4/435/150432},
}

Quick Questions About This Study

German researchers found no significant effects on learning or memory in rats exposed to 900 MHz cell phone radiation for nearly their entire lives. Even at high exposure levels of 10 W/kg, cognitive function remained normal throughout development and aging.
A 2014 German study found no harmful effects on brain development when rats were exposed to GSM 900 MHz radiation starting from early age. Behavioral tests and memory assessments showed no significant differences compared to unexposed control groups.
The Klose study tested SAR levels up to 10 W/kg, which is much higher than typical cell phone exposure levels. Even at these elevated radiation doses, researchers found no significant behavioral or memory impairments in the exposed rats.
Research by Klose and colleagues found no cognitive problems in rats chronically exposed to 900 MHz EMF from youth through old age. The study suggests long-term cell phone radiation exposure may not impair learning or memory function.
German researchers exposed rats to 900 MHz radiation for nearly their entire lifespans, testing cognitive abilities at different ages. This comprehensive long-term approach found no significant effects on behavior, memory, or brain development throughout the animals' lives.