Window of tolerance
Also known as window of tolerance, Optimal arousal zone
The range of arousal in which you can feel emotions and still think and cope.
At a glance
In plain words
Inside the window, Too much: hyperarousal, Too little: hypoarousal …
See all 4What it feels like inside and outside
Inside the window, Hyperarousal in the body, Hyperarousal in daily life …
See all 7Where it comes from
Dan Siegel, A safety zone
See all 2How therapists use it
Psychoeducation, Grounding back in, Widening it …
See all 4Connections
Psychological trauma, Complex post-traumatic stress disorder and 2 others
See all 4
Also on this page: Key facts · Links · Sources · Related pages
- The window of tolerance is the range of arousal where you can handle emotions without overwhelm or numbness.
- Psychiatrist Dan Siegel introduced the term in 1999.
- Above it is hyperarousal: panic, anger, overwhelm.
- Below it is hypoarousal: numbness, withdrawal, dissociation.
- Trauma tends to narrow the window; therapy aims to work inside it and widen it.
Why it matters
- It gives clients and therapists a shared, simple map for when processing is possible and when to stabilize first.
Key facts
- In short
- The range within which one can function and handle emotions without feeling overwhelmed or numb1
- Developed by
- Dan Siegel, 19991
- First book
- The Developing Mind (Guilford, 1999)2
- Above the window
- Hyperarousal: panic, irritability, impulsivity, anger1
- Below the window
- Hypoarousal: emotional numbing, dissociation, withdrawal1
- Link to trauma
- PTSD and complex PTSD are linked to narrowed or unstable windows1
In plain words
What it feels like inside and outside
-
Inside the window5
Course participants described it as "it feels right, I am in control of how I perform, my shoulders go down and my head feels clear", or being able to "focus on single tasks or hold several items in my mind".
-
Hyperarousal in the body5
Heart rate rises, breathing quickens and emotion intensifies; the mind becomes chaotic and hypervigilant. Some describe feeling wired or agitated, or an urge to move.
-
Hyperarousal in daily life6
Parents with PTSD described it as "having a short fuse" or "exploding", such as reacting hugely when a child accidentally drops a plate at breakfast.
-
Hypoarousal in the body5
Energy drops, mood goes flat, and there may be a sense of disconnection; the mind is foggy and stuck. People describe going blank or feeling numb or hopeless.
-
Hypoarousal in daily life6
Parents described "shutting down", "closing themselves off" or "freezing": "Usually I just ignore him, that's my only solution."
-
Swinging between the two5
One participant described spending most time "at the top end with the occasional spike into the red then plummet to the bottom range and sink to despairing mode".
-
A narrowing window5
Under stress one participant noticed: "I struggled to get out of the extremes because the range was narrowed, I could feel the narrowing".
Where it comes from
How therapists use it
-
Psychoeducation1
Helps clients understand and normalize their stress responses.
-
Grounding back in1
Grounding techniques bring a client back into the window when they drift out.
-
Widening it1
Regular activities that expand the window are encouraged.
-
The research angle4
Studies suggest an inverted U: both too little and too much in-session arousal can hinder processing; the window concept matches this.
Connections
Links
Sources
- Window of Tolerance (Psychology Tools) (opens psychologytools.com)
- Daniel J. Siegel (Wikipedia) (opens en.wikipedia.org)
- The Role of Safety in Change-Promoting Therapeutic Relationships: An Integrative Relational Approach. Clin Neuropsychiatry 2024 (opens pmc.ncbi.nlm.nih.gov)
- Change in Emotional Arousal Variance in Clients with Borderline Personality Disorder during a Brief Psychiatric Treatment. Psychopathology 2025 (opens pmc.ncbi.nlm.nih.gov)
- Rose SA, Sheffield D, Harling M. The Integration of the Workable Range Model into a Mindfulness-Based Stress Reduction Course: a Practice-Based Case Study. Mindfulness 2018;9(2):430-440 (opens pmc.ncbi.nlm.nih.gov)
- Meijer L, Thomaes K, Karadeniz B, Finkenauer C. Understanding and supporting parenting in parents seeking PTSD treatment: a qualitative study. Eur J Psychotraumatol 2025;16(1):2468039 (opens pmc.ncbi.nlm.nih.gov)
Last checked against its sources today
Is something on this page wrong or out of date? Tell us
The line under a date fills as time passes: empty when new, then one equal share each for a day, a week, a month and a year. For episodes and other items it is full at 2 years; for "last checked", at a year. A striped line means the date is known only to the month or year.