Autonomic Signals (Cardiovascular and Respiratory) Visible autonomic behaviors include respiratory and cardiovascular signposts. Breathing that is rapid, shallow and/or high in the chest indicates sympathetic arousal. Breathing that is very shallow (almost imperceptible) frequently indicates immobility, shutdown and dissociation. Breathing that is full and free with a complete expiration, and a delicate pause before the next inhalation, indicates relaxation and settling into equilibrium.
