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Behavioral thermoregulation in the squirrel monkey: adaptation processes during prolonged microwave exposure.

E R Adair, B W Adams

    Behavioral Neuroscience
    |February 1, 1983
    PubMed
    Summary

    Squirrel monkeys exposed to microwave radiation (2450 MHz) at higher power densities (10-20 mW/cm2) actively seek cooler environments. Exposure duration did not significantly alter this thermoregulatory behavior.

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    Area of Science:

    • Environmental Health
    • Bioelectromagnetics
    • Thermoregulation

    Background:

    • Microwave radiation exposure can affect biological systems.
    • Understanding thermoregulatory responses to non-ionizing radiation is crucial for safety guidelines.
    • Previous research indicates potential thermal effects of microwaves.

    Purpose of the Study:

    • To investigate the impact of microwave exposure duration and power density on squirrel monkey thermoregulation.
    • To determine the threshold power density at which microwave exposure influences behavioral thermoregulation.

    Main Methods:

    • Squirrel monkeys were exposed to 2450-MHz continuous-wave microwaves in an anechoic chamber.
    • Animals controlled ambient temperature by selecting between cold and warm air sources.

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  • Microwave power densities of 4, 10, and 20 mW/cm2 were tested for durations of 5 to 150 minutes.

    • Main Results:

    • Microwave exposure at 4 mW/cm2 did not affect thermoregulatory behavior, regardless of duration.
    • Exposures at 10 and 20 mW/cm2 significantly induced monkeys to select cooler ambient temperatures (1.5°C and 3.0°C cooler, respectively).
    • Exposure duration had minimal impact on temperature selection, except during initial exposures.

    Conclusions:

    • Microwave power density, not duration, is the primary factor influencing behavioral thermoregulation in squirrel monkeys.
    • A power density threshold exists above which microwaves elicit a cooling-seeking response.
    • These findings contribute to understanding the physiological effects of microwave radiation.