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Brain & Nervous SystemPart of the Glaser Archive

EFFECT OF 19 MHZ RF RADIATION ON NEUROTRANSMITTERS IN MOUSE BRAIN

No Effects Found

James H. Merritt, James W. Frazer · 1975

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19 MHz radiofrequency radiation showed no effect on mouse brain neurotransmitters in this early EMF study.

Plain English Summary

Summary written for general audiences

Researchers exposed mice to 19 MHz radiofrequency radiation and measured key brain chemicals including serotonin, dopamine, and norepinephrine. The RF exposure did not alter levels of any neurotransmitters tested. Interestingly, the method used to euthanize control animals affected brain chemical measurements more than the radiation itself.

Why This Matters

This 1975 study provides an early look at whether radiofrequency radiation affects brain chemistry, finding no impact from 19 MHz exposure on critical neurotransmitters that regulate mood, attention, and behavior. While the frequency tested (19 MHz) falls below modern cell phone ranges (typically 700 MHz to 5 GHz), it's within the spectrum used by some radio communications and older wireless technologies. The finding that the euthanization method had a bigger effect on brain chemistry than the RF exposure itself highlights how sensitive these measurements can be to experimental conditions. What's particularly relevant today is that this study examined the very brain chemicals most concerned parents and researchers worry about when considering EMF effects on neurological function and behavior.

Finding

Brain levels of 5-hydroxyindole acetic acid (SHIAA), homovanillic acid (HVA), serotonin (5HT), norepinephrine (NE), and dopamine (DA) were not altered by this radiation.

In their words

“Brain levels of 5-hydroxyindole acetic acid (SHIAA), homovanillic acid (HVA), serotonin (5HT), norepinephrine (NE), and dopamine (DA) were not altered by this radiation.”
Cite This Study
James H. Merritt, James W. Frazer (1975). EFFECT OF 19 MHZ RF RADIATION ON NEUROTRANSMITTERS IN MOUSE BRAIN.
Show BibTeX
@article{effect_of_19_mhz_rf_radiation_on_neurotransmitters_in_mouse_brain_g3790,
  author = {James H. Merritt and James W. Frazer},
  title = {EFFECT OF 19 MHZ RF RADIATION ON NEUROTRANSMITTERS IN MOUSE BRAIN},
  year = {1975},
  
  
}
No DOI on file for this study.

Quick Questions About This Study

Researchers measured five key brain chemicals: serotonin (5HT), dopamine (DA), norepinephrine (NE), plus their metabolites 5-hydroxyindole acetic acid (5HIAA) and homovanillic acid (HVA). These neurotransmitters control mood, movement, attention, and other vital brain functions.
No, the 19 MHz radiofrequency exposure did not alter levels of any of the five neurotransmitters and metabolites measured. Brain concentrations of serotonin, dopamine, norepinephrine, and their breakdown products remained unchanged after RF exposure.
19 MHz is much lower than cell phone frequencies, which typically range from 700 MHz to 5 GHz. However, 19 MHz falls within radio communication bands and some older wireless technologies, making it relevant for understanding lower-frequency RF effects.
The method of euthanizing the animals had a bigger impact on brain neurotransmitter levels than the 19 MHz radiation exposure. Microwave brain inactivation produced higher concentrations of four brain chemicals compared to cervical dislocation in control animals.
Microwave heating rapidly inactivates brain tissue, preventing post-mortem changes in neurotransmitter levels that could confound measurements. This method ensures accurate assessment of brain chemistry at the moment of death, though it ironically affected results more than the RF exposure itself.