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    Mental tasks can influence spinal motor neurons through high-frequency oscillations above 10 Hz, detectable in electromyography (EMG) signals. These findings suggest potential for movement augmentation applications.

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    Area of Science:

    • Neuroscience
    • Motor Control
    • Biomedical Engineering

    Background:

    • Spinal motor neurons process diverse input frequencies, but typically only those below 10 Hz directly influence motor output.
    • Higher frequency oscillations (>10 Hz) are usually filtered, but may indirectly affect motor output or originate from supraspinal areas.
    • Understanding these higher frequencies could reveal new control signals for applications like movement augmentation.

    Purpose of the Study:

    • To investigate if mental tasks induce detectable changes in high-frequency oscillations (>10 Hz) in spinal motor neuron output.
    • To determine if these oscillations can be classified and differentiated based on cognitive tasks.
    • To explore the potential of using these oscillations for movement augmentation.

    Main Methods:

    • High-density electromyography (HD-EMG) signals were recorded from the tibialis anterior muscle during isometric dorsiflexion.
    • Subjects engaged in various mental tasks: imagining movement, mathematical calculations, or a control state.
    • Channel-averaged HD-EMG and cumulative spike trains (CST) of motor units were analyzed using filter banks and linear classifiers.

    Main Results:

    • In some subjects, mental tasks induced oscillations above 10 Hz that were classifiable from HD-EMG and CST signals.
    • These detected oscillation modulations were independent of force level changes.
    • Findings suggest that supraspinal oscillations can influence spinal motor neurons and be detected via EMG.

    Conclusions:

    • Mental tasks can modulate high-frequency oscillations (>10 Hz) in spinal motor neurons, detectable through EMG and motor unit activity.
    • These findings support the hypothesis that supraspinal oscillations can 'leak down' to the spinal level.
    • The results indicate a potential basis for using cognitive states to control or augment movement.