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The relationship between NMDA receptors and microwave induced learning and memory impairment: a long term observation on Wistar rats.

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Wang H, Peng R, Zhao L, Wang S, Gao Y, Wang L, Zuo H, Dong J, Xu X, Zhou H, Su Z. · 2014

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Microwave exposure caused lasting memory problems in rats for 18 months, suggesting wireless radiation may have permanent cognitive effects.

Plain English Summary

Summary written for general audiences

Chinese researchers exposed rats to microwave radiation at levels similar to some wireless devices and tracked their brain function for 18 months. The exposed rats showed persistent problems with spatial learning and memory, along with damage to brain structures and disrupted brain chemistry. This suggests that microwave exposure can cause lasting cognitive impairment through multiple biological mechanisms.

Why This Matters

This study provides compelling evidence for long-term cognitive effects from microwave exposure at power levels within the range of everyday wireless devices. The 50 mW/cm² exposure level, while higher than typical cell phone use, falls within ranges that people can encounter from WiFi routers, radar systems, or when holding devices close to the head during calls. What makes this research particularly significant is its 18-month follow-up period, demonstrating that cognitive deficits don't recover over time but persist long after exposure ends. The researchers identified specific biological mechanisms behind the memory problems, including disrupted neurotransmitter balance and damaged brain cell connections in the hippocampus, the brain's memory center. This adds to a growing body of evidence suggesting that microwave radiation can cause measurable neurological changes, contradicting industry claims that non-thermal exposures are harmless.

Exposure Details

Power Density
50 µW/m²
Source/Device
2.856 GHz
Exposure Duration
6 min

Exposure Context

This study used 50 µW/m² for radio frequency:

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: 50 µW/m²Extreme Concern - 1,000 uW/m2FCC Limit - 10M uW/m2Effects observed in the Severe Concern rangeFCC limit is 200,000x higher than this level
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 2.86 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 2.86 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

To investigate whether high power microwave could cause continuous disorders to learning and memory in Wistar rats and to explore the underlying mechanisms.

Eighty Wistar rats were exposed to a 2.856 GHz pulsed microwave source at a power density of 0 mW/cm...

Our results showed that the microwave-exposed rats showed consistent deficiencies in spatial learnin...

This study indicated that the content of amino acids neurotransmitters, the expression of NMDAR subunits and the variation of hippocampal structure might contribute to the long-term cognitive impairment after microwave exposure.

Cite This Study
Wang H, Peng R, Zhao L, Wang S, Gao Y, Wang L, Zuo H, Dong J, Xu X, Zhou H, Su Z. (2014). The relationship between NMDA receptors and microwave induced learning and memory impairment: a long term observation on Wistar rats. Int J Radiat Biol. 2014 Nov 26:1-25.
Show BibTeX
@article{h_2014_the_relationship_between_nmda_1421,
  author = {Wang H and Peng R and Zhao L and Wang S and Gao Y and Wang L and Zuo H and Dong J and Xu X and Zhou H and Su Z.},
  title = {The relationship between NMDA receptors and microwave induced learning and memory impairment: a long term observation on Wistar rats.},
  year = {2014},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/25426698/},
}
PubMed: 25426698

Cited By (37 papers)

Quick Questions About This Study

Chinese researchers found that rats exposed to 2.856 GHz microwave radiation showed persistent spatial learning and memory problems for 18 months. The exposed rats experienced hippocampal neuron damage, disrupted brain chemistry, and decreased NMDA receptor expression, suggesting lasting cognitive impairment from microwave exposure.
A 2014 study found that 2.856 GHz microwave radiation significantly decreased NR1 and NR2B NMDA receptor expression in rat brains, particularly the NR2B subunit. This receptor damage was linked to persistent spatial learning deficits and hippocampal structural changes over 18 months.
Researchers discovered that microwave radiation decreased amino acid neurotransmitter levels in rat brains, with the glutamate-to-GABA ratio significantly dropping at 6 months post-exposure. This neurotransmitter disruption contributed to long-term cognitive impairment and spatial memory problems in the exposed animals.
Microwave-exposed rats showed varying degrees of hippocampal neuron degeneration, increased postsynaptic density, and blurred synaptic clefts. These structural brain changes persisted throughout the 18-month observation period and correlated with spatial learning and memory deficits in the animals.
A long-term rat study using 2.856 GHz radiation (similar to some wireless devices) found persistent brain chemistry alterations including decreased neurotransmitter levels and reduced NMDA receptor expression. These changes lasted 18 months and were associated with ongoing cognitive impairment and hippocampal damage.