Window of Tolerance
Daniel Siegel's term for the zone of arousal within which a person can function, feel, think, and connect — narrowed by trauma and relational uncertainty, and widened through healing.
The window of tolerance is Daniel Siegel's term for the zone of arousal within which a person can function, feel, think, and connect. Within this window, the person has access to their full range of cognitive and emotional capacities. They can be curious, reflective, empathic, and present.
Outside the Window
Above the window: hyperarousal. The sympathetic state. Racing thoughts, shallow breath, narrowed attention, urgency without coherence. The person is activated beyond the point where integration is possible.
Below the window: hypoarousal. The dorsal vagal state. Flatness, numbness, the apparent calm that is actually collapse. The person has gone underground to conserve resources.
In Anxious Attachment
For the anxiously attached person, the window is narrowed specifically by relational uncertainty. The nervous system has learned that relational uncertainty is the primary threat, and responds to it with the same intensity it would bring to a physical threat. The specific cruelty of this configuration: the mechanism designed to widen the window, co-regulation with an attuned other, is the same mechanism that activates the alarm that narrows it. The very closeness required to feel safe is also the thing most feared to lose.
Widening the Window
The window widens through accumulated experiences of safety: consistent, attuned co-regulation with a reliable other, somatic practices that teach the nervous system to return from activation, and the gradual development of self-regulation capacity. The widening is slow. It happens through repetition, not insight.