Table 1: Range of responses of the autonomic nervous system to traumatic stress.
Response Level of Arousal Nervous System Activated Neuro-anatomy Endocrine System
Fight Increased (hyper) Sympathetic - H.P.A Axis - Adrenaline
Flight Increased (hyper) Sympathetic - H.P.A Axis - Adrenaline
Fright Increased (hyper) Sympathetic - H.P.A Axis- Adrenaline
Freeze Decreased (hypo) Unmyelinated branch of vagus Post-ganglionic muscarinic nerves -acetylcholine
Faint (vaso- vagal syncope) Decreased (hypo) Unmyelinated branch of vagus Acetylcholine
Feigned death Decreased (hypo) Unmyelinated branch of vagus Acetylcholine