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Magnetic field influence on central nervous system function.

A D Rosen, J Lubowsky

    Experimental Neurology
    |March 1, 1987
    PubMed
    Summary
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    Strong static magnetic fields significantly reduced visual evoked responses in cats, indicating altered cortical excitability. This effect, likely synaptic, persisted even after the magnetic field was removed.

    Area of Science:

    • Neuroscience
    • Biophysics
    • Sensory Physiology

    Background:

    • Cortical excitability is crucial for sensory processing.
    • The impact of strong static magnetic fields on neural tissue is not fully understood.
    • Investigating magnetic field effects on the visual system provides insights into neural function.

    Purpose of the Study:

    • To investigate the effects of strong static magnetic fields on the excitability of the striate cortex.
    • To measure changes in cortical excitability using the visual evoked response.
    • To determine the mechanism underlying magnetic field-induced neural alterations.

    Main Methods:

    • Adult cats were exposed to a 1200-G static magnetic field.
    • Visual evoked responses (VERs) were recorded to assess cortical excitability.

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  • Changes in VER amplitude and variability were analyzed.

    • Main Results:

    • A 1200-G magnetic field significantly decreased the amplitude and variability of the visual evoked response.
    • These effects commenced over 50 seconds after field application.
    • The observed changes persisted for several minutes after the magnetic field was turned off.

    Conclusions:

    • Strong static magnetic fields alter striate cortex excitability in cats.
    • The observed effects suggest a synaptic mechanism rather than axonal conduction interference.
    • Further research is needed to elucidate the precise synaptic targets and long-term implications.