What is the window of tolerance?
Dan Siegel's term for the band of arousal where you can feel and think at once — hyperarousal above, shutdown below — and why the way out is widening, not willpower.
The window of tolerance, a term coined by Dan Siegel, is the band of arousal in which you can feel and think at the same time. Above it lies hyperarousal — racing heart, flooding, fight-or-flight; below it, hypoarousal — numbness, fog, shutdown. Inside the window, difficulty is workable. Outside it, insight simply isn't available; the machinery that would use it is offline.
You can hear the edge in an argument: the moment your voice rises and your reasoning narrows to winning — or the moment you go blank and "fine, whatever" arrives. Neither is a character flaw. Both are exits from the window.
The nuance: the aim is not never leaving — everyone leaves. It is noticing the exit earlier and returning sooner. And the window widens through regulation and safety, not through willpower.
In Arkhetia this concept doesn't stay a definition — it meets you in your sessions, tied to a moment in your own story.
Reading about a pattern is one thing. Seeing where it runs your own life is another. Arkhetia works through these lenses — with you.
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