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Related Experiment Videos

Low-intensity magnetic fields alter operant behavior in rats.

J R Thomas, J Schrot, A R Liboff

    Bioelectromagnetics
    |January 1, 1986
    PubMed
    Summary

    Combined magnetic fields significantly alter rat behavior, specifically operant responses. This effect, linked to a cellular cyclotron resonance mechanism, suggests behavior may depend on the geomagnetic field.

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    Area of Science:

    • Neuroscience
    • Behavioral Science
    • Biophysics

    Background:

    • The influence of electromagnetic fields on biological systems is an area of ongoing research.
    • Previous studies suggest weak static magnetic fields can alter in vitro brain tissue responses to low-frequency fields.
    • The geomagnetic field's potential role in biological functions remains largely unexplored.

    Purpose of the Study:

    • To investigate the effects of combined static and 60-Hz magnetic fields on operant behavior in rats.
    • To explore the potential role of a cellular cyclotron resonance mechanism in mediating these effects.
    • To determine if behavior is functionally dependent on the geomagnetic field.

    Main Methods:

    • Rats were exposed to a combination of a 60-Hz magnetic field and a 2.6 x 10(-5) T magnetostatic field for 30 minutes.
    • Operant behavior was assessed using a multiple fixed ratio (FR) differential reinforcement of low rate (DRL) reinforcement schedule.
    • Control exposures included static field alone, oscillating field alone, and increased field intensities.

    Main Results:

    • Combined magnetic field exposure significantly altered the rate and pattern of responding during the DRL component.
    • No significant behavioral changes were observed with exposure to either the static or oscillating field alone.
    • Even a 10-fold increase in individual field intensities did not produce measurable changes.

    Conclusions:

    • The combination of specific static and 60-Hz magnetic fields demonstrably affects operant behavior in rats.
    • Findings support a cellular cyclotron resonance mechanism, potentially involving lithium ions, as an explanation.
    • The study implies a functional dependence of behavior on the geomagnetic field.

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