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Connect one pendulum to another with a spring, and in time the motions of the two swinging levers will become coordinated. This behavior, which has long been a fascination of physicists and mathematicians, is called coupled oscillation. Oscillation is an inherent part of biological coordination and expression of functions and organic rhythms. Repetitive oscillatory movement can occur as sinusoidal waves or vibrations in non-linear dynamic systems, including biological systems like the human body.
In the Epstein model of Network Spinal Analysis, a coupled motion of vertebral segments/articulations which appear to move in a synchronous or phasic fashion, mediated by the Somatopsychic wave process (which occurs during entrainment sessions), is referred to as oscillation. Oscillation is an inherent part of the biological coordination and expression of living systems, and multiple oscillators that are entrained to each appear to make it easier for the body to efficiently dissipate tension and adapt to external stressors.