By limiting the motor activity of the organism we impoverish its mental processes and lower the heart-beat of mental life. The active nucleus of psycho-motor reactions becomes passive, the organism becomes disabled in its response to the stimulations of the external environment, the thresholds rise and the organism is no longer in relation with the external world. When motor activity with its concomitant motor-consciousness becomes lowered, restricted, and fades away, the organism becomes necessarily passive and passes into sleep.[/b]
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