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The polyvagal theory

The polyvagal theory: phylogenetic substrates of a social nervous system

By Stephen W. Porges, Ph.D.

Abstract

The evolution of the autonomic nervous system provides an organizing principle to interpret the adaptive significance of physiological responses in promoting social behavior. According to the polyvagal theory, the well-documented phylogenetic shift in neural regulation of the autonomic nervous system passes through three global stages, each with an associated behavioral strategy.

The first stage is characterized by a primitive unmyelinated visceral vagus that fosters digestion and responds to threat by depressing metabolic activity. Behaviorally, the first stage is associated with immobilization behaviors.

The second stage is characterized by the sympathetic nervous system that is capable of increasing metabolic output and inhibiting the visceral vagus to foster mobilization behaviors necessary for ‘fight or flight’.

The third stage, unique to mammals, is characterized by a myelinated vagus that can rapidly regulate cardiac output to foster engagement and disengagement with the environment.

The mammalian vagus is neuroanatomically linked to the cranial nerves that regulate social engagement via facial expression and vocalization. As the autonomic nervous system changed through the process of evolution, so did the interplay between the autonomic nervous system and the other physiological systems that respond to stress, including the cortex, the hypothalamicpituitaryadrenal axis, the neuropeptides of oxytocin and vasopressin, and the immune system. From this phylogenetic orientation, the polyvagal theory proposes a biological basis for social behavior and an intervention strategy to enhance positive social behavior. Copyright 2001 Elsevier Science B.V. All rights reserved.

Keywords: Vagus; Respiratory sinus arrhythmia; Evolution; Autonomic nervous system; Cortisol; Oxytocin; Vasopressin; Polyvagal theory; Social behavior

Read the entire paper:

The Polyvagal Theory. (470Kb PDF file)


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