In an Unspoken Voice: How the Body Releases Trauma and Restores Goodness

by Peter A. Levine

A direct consequence of discharge of the survival energy mobilized for fight-or-flight is the restoration of equilibrium and balance (as in the previous example of the spring). The nineteenth-century French physiologist Claude Bernard, considered the father of experimental physiology, coined the term homeostasis to describe “the constancy of the internal environment [milieu intérieur] as the condition for a free and independent life.”57 More than a hundred and fifty years later, this remains the underlying and defining principle for the sustenance of life. However, since equilibrium is not a static process, I will use the term dynamic equilibrium instead of homeostasis to describe what happens when the nervous system becomes hyperaroused in response to threat and is then “reset,” only to be aroused and reset once again. This continual resetting both restores the prethreat level of arousal and promotes the shifting state (process) of relaxed alertness. Over time this contributes to the building of a robust resilience. Finally, the interoceptive experience of equilibrium, felt in viscera and in your internal milieu, is the salubrious one of goodness: that is, the background sense that—whatever you are feeling at a given moment, however dreadful the upset or unpleasant the arousal—you have a secure home base within your organism.