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Note: This study found no significant biological effects under its experimental conditions. We include all studies for scientific completeness.

Brain & Nervous System

Modification of acoustic startle by microwave pulses in the rat: a preliminary report.

No Effects Found

Seaman RL, Beblo DA · 1992

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Microwave pulses can alter nervous system responses in rats, but the effects don't increase predictably with intensity.

Plain English Summary

Summary written for general audiences

Researchers exposed rats to intense microwave pulses just before loud sounds to see if the microwaves affected their startle reflex. They found that moderate-intensity microwave pulses delayed and reduced the rats' startle responses, but surprisingly, higher-intensity pulses had no effect. This suggests that microwave radiation can interfere with nervous system responses, but the relationship isn't straightforward.

Why This Matters

This 1992 study reveals something fascinating about how pulsed microwave radiation interacts with the nervous system. The researchers found that moderate-intensity pulses (23-48 kW/kg SAR) actually dampened the rats' startle responses, while higher intensities had no effect. This counterintuitive finding suggests complex neurological interactions that we're still working to understand. What makes this particularly relevant today is that these SAR levels, while extremely high compared to typical cell phone exposure (around 1-2 W/kg), demonstrate that pulsed RF radiation can directly influence nervous system function. The study used only four rats and represents preliminary findings, but it adds to a growing body of evidence showing that RF radiation affects neurological processes in ways that don't always follow simple dose-response patterns.

Exposure Details

SAR
23000, 48000 and 63000, 111000 W/kg
Source/Device
1.25-GHz

Exposure Context

This study used 23000, 48000 and 63000, 111000 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: 23000, 48000 and 63000, 111000 W/kgExtreme Concern - 0.1 W/kgFCC Limit - 1.6 W/kgEffects observed in the Extreme Concern range (Building Biology)This level is 14,375 times the FCC limit
A logarithmic frequency spectrum from 10 Hz to 100 GHz showing where this study's 1.25 GHz exposure sits relative to common EMF sources.Where This Frequency Sits on the EMF SpectrumELFVLFLF / MFHF / VHFUHFSHFmm10 Hz100 GHzThis study: 1.25 GHzPower lines50/60 Hz5G mm28 GHzLogarithmic scale

Study Details

Single, 1.25-GHz microwave pulses of 0.8- to 1.0-microseconds duration were presented to each of fou...

. However, at a higher energy dose per microwave pulse in the range of 59-107 mJ/kg (peak SAR, 63-111 kW/kg), the mean latency and amplitude of the startle response were not statistically different from the respective means of control responses.

Cite This Study
Seaman RL, Beblo DA (1992). Modification of acoustic startle by microwave pulses in the rat: a preliminary report. Bioelectromagnetics 13(4):323-328, 1992.
Show BibTeX
@article{rl_1992_modification_of_acoustic_startle_3387,
  author = {Seaman RL and Beblo DA},
  title = {Modification of acoustic startle by microwave pulses in the rat: a preliminary report.},
  year = {1992},
  
  url = {https://pubmed.ncbi.nlm.nih.gov/1510741/},
}
PubMed: 1510741

Cited By (6 papers)

Quick Questions About This Study

Research shows microwave radiation can affect startle reflexes, but the relationship isn't straightforward. A 1992 study found moderate-intensity microwave pulses delayed and reduced startle responses in rats, while surprisingly, higher-intensity pulses showed no effect on nervous system reactions.
Studies suggest 1.25 GHz microwave radiation can interfere with nervous system responses. Research on rats found that moderate microwave pulses affected startle reflexes by delaying and reducing responses, indicating potential nervous system interference at certain exposure levels.
Research indicates microwave pulses can affect brain and nervous system function, though effects vary by intensity. A study found moderate microwave exposures altered startle responses in rats, but higher intensities showed no significant effects, suggesting complex dose-response relationships.
Microwave radiation pulses may affect nervous system function based on animal studies. Research found moderate-intensity pulses can delay and reduce startle responses, though higher intensities showed no effects. The health implications for humans require further investigation and research.
Pulsed microwave exposure can modify reflex responses depending on intensity levels. A rat study showed moderate microwave pulses delayed and reduced startle reflexes, while higher-intensity pulses produced no significant changes, indicating complex effects on nervous system function.