what the impala knows that we don't

The impala goes down. It doesn't fight anymore, doesn't run. It lies there, completely still, while the cheetah catches its breath.

Then the hyena shows up.

The cheetah and the hyena start their own altercation - and in that window, something shifts in the impala. Not a decision, exactly. A recognition. The threat is no longer on it. And in one clean motion, it's up and gone.

No debrief. No processing. No five minutes of shaking while telling its herd what just happened. It just... resumes. Eating, orienting, staying in contact with its environment. The whole thing - predator, freeze, escape - metabolized and released in the time it took to read this paragraph.

We don't do that.

Animals in the wild have something we don't: the absence of a very specific human capability, the ability to hold an event in place after it's over. This is not better neurology, superior resilience, or a simpler life, though the life is simpler.

The autonomic nervous system runs the same script in an impala as it does in us. Threat enters. The orienting response kicks in - a pause, a looking, an evaluation of is this real? If the threat holds, the sympathetic system charges up. Adrenaline moves into the bloodstream. Blood shifts to the limbs. The heart pumps harder. The system prepares.

And if that still isn't enough - if there's no way out, no way through - the system does something older than fight or flight. It shuts down. The dorsal vagal branch of the parasympathetic nervous system takes over. Heart rate drops. Metabolism slows. Blood pulls away from the periphery, draws inward. The animal collapses into immobility.

This is not giving up. It is the oldest protection mechanism we have available.

The freeze state looks like calm from the outside. It isn't. The fight/flight charge is still there, stored in the body at peak arousal, even as the system has gone quiet on the surface. Both things are true at once - the brake fully on, the gas still pressed. This is sometimes called shock. It is the deer-in-the-headlights moment before the shutdown completes.

In the impala's case, the window opens, the shutdown lifts, and all that stored fight/flight energy is exactly what it needs to run. The system completes its arc. Then it comes back to baseline.

We mostly don't complete the arc.

The human brain is why. The cortex - that large, extraordinary, expensive structure - can hold a past event in the nervous system's present tense. The impala doesn't ruminate over its near-death. It doesn't replay the moment the cheetah's jaws closed. It doesn't wake up three days later in a low-grade activation it can't explain.

We do. And over time, that rumination keeps the system charged. The sympathetic response that was never fully discharged stays available, primed, looking for confirmation that the threat is still real. Or the system stops looking entirely - overwhelmed, it collapses into what is called a functional freeze. Still moving through the day. Still capable, functional, getting things done. But internally running in conservation mode: low metabolism, low oxygen delivery to organs and tissue, a kind of going-through-the-motions that the outside world rarely sees.

Functional freeze isn't one thing. Some people in it are startled by everything; the charge is high beneath the surface, always primed. Others have lost the startle response entirely - not because they're calm, but because they've stopped expecting anything to be safe. And most of us switch between the two as well.

I know this through my own experience. Because some of us learned very early to freeze instead of feel. Looking back, I recognize periods in my life when I was in a functional freeze. It still grabs me from time to time but now I catch it earlier and shift it faster.

The clearest way I know to show what this looks like is through two moments of my own. One where the arc held frozen longer than I realized and another where it released - but in doing so, found something else waiting underneath.

Last year I fell on the sharp edge of my own ski. The cut went deep - through skin, tissue, through the patellar ligament, destroying most of it. I felt nothing. No pain. I genuinely thought I would be back on the slopes the next day. What I didn't know yet was that I wouldn't bend that knee freely for more than five months.

The arc completed months later, in an osteopathy session. My practitioner moved my leg very gently - completing the motion the body had held in place since the fall. What happened next I couldn't have predicted. My body began to tremble. Tears came, without grief attached to them. Just release. The discharge, textbook reaction, moving through me the way I had read about it and watched in others. It was something else to feel it from the inside.

That discharge was clean. The next one wasn't.

Our plane had a bird strike. The engine sound changed, the aircraft lurched, and something in me went completely still. No fight, no flight - there was nowhere to go. Pure freeze, in a sealed space at altitude. When we landed back safely, my body did exactly what the biology predicts: a full, classical discharge. Shaking, trembling, the stored charge finally moving through.

The arc of the nervous system completed. And yet.

The fear of flying stayed. It's still here. That fear is not the physiology of that moment - it's the cortex doing what the cortex does, reaching back through its archives, pulling up older fears, older threats, older incomplete arcs, and stitching them to this one (in trauma work we call this over-coupling). The nervous system discharged. The mind grafted meaning onto what was left.

Both things can be true. The body can complete its response and still carry the residue of everything that came before it. This is the difference between an acute event and accumulated history. The impala has one arc to complete. We often have many, layered on top of each other, each one pressing on the next.

This matters beyond the physical.

When the autonomic nervous system is chronically stuck - either at high sympathetic charge, or in that paradoxical combination of freeze and fight/flight running simultaneously - the organs that depend on it suffer quietly. Digestion, immune function, hormonal regulation, sleep. These systems work. They just don't work as well as they could. The research on untreated early trauma and chronic illness is pointing here, slowly: the body that never completed its stress arc carries the cost in tissue.

And then there's what we lose at the higher end. Creativity, curiosity. Genuine engagement. The capacity to learn something new and let it settle. The social engagement nervous system - the one that allows us to be in real contact with another person, or an idea, or the world - goes offline when the survival systems are running the show. We lose access to ourselves, slowly, in ways we often can't name.

The impala, back with its herd, is grazing. Present. Available.

That is what we're moving toward - not an animal life, not the absence of thought or memory or reflection. Something more specific: the capacity to complete the arc. To let the stress response do its work and then allow the system to come back to itself, back to that easy ebb and flow, activated by threat and returned, over time, to rest.

That return is learnable. It requires more from us than the animals need, because we have more cortex and more history to work with. But the underlying biology is the same: the nervous system knows how to complete its arc. It is waiting for the conditions that allow it to do so.

So I started paying attention to where in my life the arc hasn't completed. Not to analyze it. Just to notice what's there.

You can start there too. Notice what's present in your body right now. Name it if you can - not to fix it, just to make contact. And if you want somewhere concrete to begin, orienting is one of the most direct ways back. (I wrote about orienting here.)