Why the past feels like the present

The answer is that the part of the brain that knows it's over is not the part that reacts.

Two kinds of memory

Ordinary memories get filed away. They are given a label: this happened back then, it's over now. When you call them up, you know the whole time that you are sitting here, remembering.

Traumatic memories often don't get filed in that way. During an overwhelming event, the body is busy with something more important than organising memory — it is busy surviving. The material is left raw: sounds, smells, bodily sensations, fragments of images. Without a label.

That is why it comes back as something that is happening now. A flashback is not a vivid memory. It is the brain replaying the material without a timestamp.

That's why reasoning doesn't work

You can know perfectly well that you are safe and at the same time have a nervous system that is convinced of the opposite. The two things take place in different systems, and one does not override the other.

That is also why well-meant advice rarely helps. "Try to think about something else" asks one part of the brain to control another part it has no access to.

On high alert

After a trauma, the nervous system often stays in a kind of permanent state of alert. You sleep restlessly, startle easily, scan rooms for exits, read other people's faces for danger. That is not oversensitivity. It is a system that has learned that it did not pay to relax.

The price is high. Being constantly on alert is exhausting, and from the outside it often looks like something else — stress, irritability, trouble concentrating or depression.

The avoidance that keeps it going

The third mechanism is the one that makes the trauma chronic. Because everything that reminds you of the event triggers the reaction, you begin to avoid: places, conversations, films, people, thoughts.

Every avoidance works. And every avoidance tells the system that the danger was real — so next time the reaction is just as strong. The trauma never gets the chance to be fully processed, because you never get close enough to it for that to happen.

What treatment actually involves

Not retelling it. Not "working through it by talking about it", as you often hear.

Treatment is about getting close enough to the active material for it to be filed away — without getting so close that the system goes into overload and all that happens is re-experiencing.

That window is narrow, and it varies from person to person and from day to day. Finding it and staying in it is the whole craft. In ISTDP we do this by following the body's anxiety signals closely: the hands, the breathing, whether the thoughts are starting to go foggy. They tell us when to go further and when to slow down.

When it has gone on for a long time

In complex PTSD — after repeated or early trauma — there is more at stake than individual memories. Here the whole way of regulating emotions, and the whole sense of self, has taken shape around what happened. It takes longer, and the order of things matters more.