Polyvagal Architecture
Why Freeze Specifically?
The autonomic nervous system offers multiple survival responses:
Fight
Energy has somewhere to go. You're acting, engaging, discharging activation through behaviour. No need for a mini-game because you're already playing the main game.
Flight
Same principle. You're moving, escaping. Energy flows out through action.
Fawn
Attention is externally occupied. You're reading the other person, performing for them, managing the relationship. The mind has a task: figure out what they need and provide it.
Freeze
The body cannot act, but the mind remains activated. You're charged but stuck. No physical outlet. No external task. So the mind generates its own activity. OCD becomes the game you can play while frozen. Rumination is motion that doesn't require movement.
OCD could theoretically emerge in any state, but freeze is where it's most necessary and most severe: the only survival state where you need an internal mini-game because all external games are blocked.
Freeze vs. Pure Dorsal Shutdown
Critical Distinction
OCD is associated with the freeze state specifically: sympathetic arousal plus dorsal vagal immobilisation. Not pure dorsal shutdown (which produces collapse, brain fog, dissociation).
In freeze: the body is highly charged, fearful, activated, alert, yet stiff, frozen in place, unable to move. Cognitive activity remains present but constrained. The mind is racing while the body cannot act.
This maps precisely onto OCD phenomenology: intense mental activation (rumination, obsessive loops, mental checking) occurring within a sense of being "stuck."