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Related Experiment Videos

The relation between monosynaptic spinal reflex amplitudes and some EEG alpha activity parameters.

A van Boxtel

    Electroencephalography and Clinical Neurophysiology
    |March 1, 1976
    PubMed
    Summary

    Repetitive tendon reflexes in humans decrease with repetition. This study links reflex amplitude changes to electroencephalogram (EEG) alpha activity, suggesting supraspinal influences on reflex modulation.

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    Area of Science:

    • Neuroscience
    • Human Physiology

    Background:

    • Repetitive stimulation of human tendon reflexes often results in decreased reflex amplitudes.
    • The underlying mechanisms, whether spinal or supraspinal, remain debated.

    Purpose of the Study:

    • To investigate the relationship between Hoffmann (H) reflex and Achilles tendon (T) reflex amplitudes and electroencephalogram (EEG) alpha activity.
    • To determine if reflex decrement is influenced by cortical activation levels.

    Main Methods:

    • Two experiments were conducted on normal human subjects during a rest condition.
    • Measurements included H and T reflex amplitudes and EEG alpha activity parameters (index, amplitude, period).

    Main Results:

    • Stable reflex amplitudes correlated with a constant alpha index.

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  • Decreasing reflex amplitudes were associated with a decreasing alpha index.
  • Positive correlations were observed between H and T reflex amplitudes, and between alpha index and alpha amplitude.
  • Relations were state-dependent and showed significant interindividual variability.

    • Conclusions:

    • Reflex amplitude changes during repetitive stimulation are linked to cortical activation, as indicated by EEG alpha activity.
    • Supraspinal influences play a role in modulating tendon reflex responses.
    • Individual differences in activation states impact these neurophysiological relationships.