I’ve been writing about how we use the term “trauma” to name everything painful. Well, there are additional problems with the use of language under the trauma studies. I want to talk today about “freeze.”
We’ve been using that word—freeze—to describe two completely different reactions to threat. And it’s causing real confusion for everyone trying to understand whether they’re traumatized or what their symptoms mean.
Think about it. When your therapist says “you froze,” do they mean you were alert and scanning for danger, muscles tense, ready to act? Or do they mean you went numb, collapsed inward, and later couldn’t remember what happened? These are extremely different experiences, and giving them the same name makes it frustrating and misleading.
For two decades, “fight-flight-freeze” has lumped together a sharp, vigilant pause with a shutdown that disconnects you from your body. No wonder clients feel confused. No wonder clinicians miss what’s actually happening.
Let me offer a clearer split—and the names that make sense of what your nervous system is actually doing.
Two completely different “freezes”
1. Lock (the attentive immobility-orienting-paralyzation)
This is the instant your system needs to find out what’s happening before making a decision about how to protect your life. Think of that moment when you hear a suspicious sound. You stop. Muscles tense, senses sharpen, and heart stays steady or quickens. You’re not shutting down—you’re buying time while your brain figures out what to do next by staying ready to act but not yet.
We can compare it with your camera’s autofocus—the body stops and sharpens to get the picture right before deciding to shoot.
Kozlowska and her colleagues describe this beautifully: it’s “fight-flight put on hold.” I call it “lock” because that’s what it does—it locks your system into a poised, decision-ready state. It’s adaptive. It’s brief. It’s your brain catching up to the situation.
This isn’t helplessness. It’s your nervous system being smart about avoiding a crisis before it knows it’s real, and therefore, managing resources intelligently.
2. Immobilization (the shutdown)
This is what most people picture (or refer to) when they hear “freeze.” Muscles go limp or flaccid. Heart rate drops. Attention narrows or dissociates entirely. Memory encoding falters or stops. Vitals slow down, emotions get numbed.
This happens after fight and flight have already failed to eliminate the threat. It’s your body’s last-resort strategy, drawing on deep parasympathetic processes—what researchers call tonic immobility, collapse, or severe dissociation. In the moment, it reduces pain and physiological risk. But when it happens repeatedly or in extreme form, it’s strongly linked to lasting trauma symptoms.
A person assaulted might describe their mind going blank, details vanishing. That blankness isn’t a choice or a weakness—it’s a neurobiological consequence of reduced cortical connectivity, of the brain pulling resources away from memory and other functions to prioritize survival.
Why this distinction matters
Calling both reactions “freeze” creates predictable problems:
We confuse vigilance with shutdown. Someone who’s chronically tense and indecisive (Locked) gets mistaken for dissociation, when their physiology is actually primed and alert—just stuck in the pause.
We miss the sequence. Lock sits before mobilization; immobilization follows mobilization’s failure. That order affects everything—how we interpret symptoms, how we understand what went wrong, and how we help someone recover.
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We mislead people about what happened to them. When you tell someone “you froze,” they might hear helplessness. But if their brain paused to gather information, that’s not helplessness—that’s an adaptive response that deserves respect.
What your nervous system is actually doing
These two reactions recruit completely different circuits. Lock is a state of co-activation—readiness held in check, with clear senses and muscle tone intact. Immobilization draws on dorsal vagal pathways, drops your vitals, reduces cortical connectivity, and disrupts memory.
If you know polyvagal theory or defense-cascade models, you already have the framework for this. Lock operates in the social-engagement zone and mobilization zone. Immobilization is full dorsal shutdown.
What this helps us see
Presence matters. When someone orients successfully—when they can assess the situation and find safety—the system often doesn’t escalate further. This is why a steady voice, an attuned face, or a calm hand can stop panic before it tips into emergency mode.
Recovery needs time. After extreme activation, your body needs quiet restoration. Forcing yourself back to “normal” too quickly interrupts the healing process your nervous system is trying to complete.
Language shapes what we expect. When we reserve “immobilization” for dorsal shutdown and use “Lock” or “paralyzation” for the pre-mobilization pause, everyone—clients and clinicians alike—gets a clearer map of what actually happened and what might happen next.
Why this matters beyond terminology
We hear about fight-flight-freeze by comparing humans to animals in the wild facing predators. But that’s not our world. We’re not being chased by lions.
What we face instead: the terror of rejection, of pain, of death, of inevitable loss. Our minds can treat these as predator threats, triggering the same survival circuitry. And when that happens, we can live in survival mode without understanding why.
But here’s what makes us different: Lock is actually designed to help us reflect, assess the actual danger, and decide whether we’re truly unsafe or not. We’re complex, evolved beings with the capacity to use our thinking brain to regulate our fears and choose engagement—with others, with ourselves—to get the best possible outcome from being alive.
When we understand what our nervous system is doing and why, we stop feeling resigned to automatic survival strategies. We can work with our biology instead of against it.
And that starts with calling what’s happening to you (or your clients) by its right name.
