Neuroception of threat shifts us into a range of defensive platforms, the ultimate goal of all of which is to return us to safety. The platform we select is generally not consciously chosen. In the Polvyagal Theory, Dr. Porges has identified 4 physiologically distinct defensive state. These are fight and flight, both sympathetically-mediated, high-energy, mobilized, and polarizing, and, shutdown, which is mediated by the dorsal vagal circuit, and is an immobilization response. Freeze (aka tonic immobility) is a hybrid state with both sympathetic (muscles rigid) and dorsal vagal (immobilization) aspects. Note that there is not yet standardization of language in several disciplines around the immobization states. Somatic Experiencing, for example, doesn’t distinguish between hybrid and pure dorsal vagal states, referring to both as freeze.