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A theoretical sub-system (based on Panjabi’s spinal stability sub-system model) proposed by Donny Epstein, developer of Network Spinal Analysis, in which emotion is a range of motion (rhythmic oscillation) and tension within any tissue of the body, including the elements of the passive and active neural control subsystems. The Emotional Subsystem is thought to occupy portions of the same anatomical and physiological space as the other three subsystems proposed by Panjabi. It is also hypothesized that the Emotional Subsystem reflects the potential range of oscillation and baseline (or resting) tension within tissues.