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Rhesus monkey behavior during exposure to high-peak-power 5.62-GHz microwave pulses

J A D'Andrea1, A Thomas, D J Hatcher

  • 1Aviation Performance Division, Naval Aerospace Medical Research Laboratory, Pensacola, Florida.

Bioelectromagnetics
|January 1, 1994
PubMed
Summary
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High-peak-power pulsed microwaves at 4 and 6 W/kg significantly altered rhesus monkey behavior, affecting lever responding and reaction times. Radar and SLED pulses showed similar effects, highlighting the need for exposure limits for pulsed microwave technology.

Area of Science:

  • Biomedical Engineering
  • Electromagnetics
  • Neuroscience

Background:

  • Recent adoption of exposure limits for high-peak-power, short-duration microwave pulses.
  • Need for further data on the biological effects of high-peak-power pulsed microwaves.

Purpose of the Study:

  • Investigate the behavioral effects of very high-peak-power 5.62 GHz microwaves on rhesus monkeys.
  • Compare behavioral effects of military radar pulses versus enhanced-power SLED pulses.

Main Methods:

  • Four male rhesus monkeys trained on a variable interval schedule operant task.
  • Exposure to 5.62 GHz microwave pulses (radar or SLED) at 100 pulses per second for 20 minutes.
  • Tested peak field power densities and specific absorption rates (SARs) of 2, 4, and 6 W/kg, compared to sham exposure.

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Main Results:

  • Significant alterations in lever responding, reaction time, and food pellet acquisition observed at 4 and 6 W/kg SARs.
  • No significant behavioral effects were noted at 2 W/kg SAR.
  • No discernible differences in behavioral effects between radar and SLED pulse exposures.

Conclusions:

  • High-peak-power pulsed microwaves at SARs of 4 and 6 W/kg can induce significant behavioral changes in non-human primates.
  • Current exposure limits may need reevaluation based on these findings.
  • Further research is warranted to fully understand the neurobehavioral impacts of pulsed microwave exposure.