Understanding Your Window of Tolerance
Overview
“Window of Tolerance” is a term originally coined by Dr. Dan Siegel commonly used to understand and describe normal brain/body reactions, especially following adversity.
It is also a term used to describe the zone of arousal in which a person is able to function most effectively.
Essentially, the size of our ‘window’ depends upon how much we are able to tolerate mild fluctuations in mood, energy levels, and the challenges and demands of life, whilst remaining in the Optimal Zone.
What Affects the Size of Your Window?
-
Our baseline capacity is influenced by genetics and early brain development — we don’t choose the window we’re born with.
-
Adverse experiences, particularly in childhood, can narrow the window by over-sensitizing our nervous system to stress.
-
Fortunately, we can expand our window over time with the right support, habits, and practices.
As seen in the diagram below, there is an Optimal Zone (or range) that we can function:
The Optimal Zone: Calm Activation & Deactivation
When we are within our Window of Tolerance we are essentially in the optimal zone (depicted above), our nervous systems (Sympathetic and Parasympathetic) are in a state of balance, which allows for adaptive responses to stress (i.e., Calm Activation depicted above) and a capacity for emotional regulation to balance this stress (i.e., Calm Deactivation, depicted above). In other words, we are calm but alert enough to be engaged in what we are doing without it being excessive, and we have ‘headroom’ to manage (and recover from) any challenges that may arise. Thus, when we are within our Window of Tolerance, we can engage in flexible thinking, effective communication and actions, and we are able to cope with daily stressors, build healthy relationships, and regulate our emotions constructively as required.
Just like how a thermostat in an air-conditioner makes micro-adjustments to temperature to keep it within a comfortable range, staying within the Optimal range of our Window of Tolerance requires awareness and skills, so that we can attend to our needs and can regulate our arousal level to match the situation at hand. Ordinarily we can do this either with self-soothing actions (or by reaching out to trusted soothing others) when we need to Deactivate our arousal, or via safe, healthy activities that stimulate us when we need to Activate our arousal.
However, the accumulation of Stress and/or feeling a state of Threat can shrink our Window of Tolerance. Once pushed outside our Window of Tolerance, it can become very difficult to take in new information. This is because these states of Hyper-arousal and Hypo-arousal are ancient physiological survival mechanisms that are shared across species throughout the entire animal kingdom.
For people who have experienced significant stress (which may either be the result of a single incident, or ‘toxic stress’ resulting from the accumulation of triggering events), it is common for the brain to become ‘stuck’ in high levels of Activation or Deactivation – and this can either lead to an inability to stay calm (triggering the fight / flight response) or shutting down (the freeze response) involuntarily when confronted with stress.
In other words, a threat, or the accumulation of excessive stress, or traumatic experiences can disrupt an individual’s ability to stay within their Window of Tolerance, causing them to become overwhelmed or shut down.
For example, if someone becomes hyperaroused, they may exhibit symptoms of anxiety, anger, or panic. On the other hand, if they become hypoaroused, they might experience symptoms of depression, dissociation, or a sense of detachment. As will be discussed, this is not the fault of the individual – it is simply how our brain’s became wired (i.e., evolved to protect us).
Understanding the Window of Tolerance is crucial in the context of therapy. For instance, a major initial aim in preparation for trauma therapies (such as EMDR Therapy) is often to help individuals expand their Window of Tolerance by developing skills for emotional regulation and increasing their capacity to tolerate distress. This work commonly includes cultivating mindfulness, self-awareness, and self-compassion to maintain a balanced state, which increases our capacity to remain within our Window of Tolerance. By developing these skills, individuals can enhance their resilience, improve their emotional well-being, and navigate life’s challenges more effectively. These same skills are highly useful in the ‘treatment phase’ of trauma therapies and help to make an individual’s experience of healing, safer and more manageable.
Even for those of us who have not experienced significant trauma, if we simply lack awareness – or have underdeveloped self-regulation skills – we may also become either too aroused (hyper-arousal) or we may completely shut down (hypo-arousal) when we encounter threats or stress. (Note: We also may not have been taught good self-care strategies and so the actions we take to reduce stress may be inadvertently contributing to the problem.)
The Window of Tolerance represents the ideal middle ground between these extremes. When we are within our Window of Tolerance, we are in a state of balance, allowing for adaptive responses to stressors and emotional regulation.
If you identify with experiencing high levels of either hyper- or hypo-arousal, this is evidence of a narrow Window of Tolerance, and once we have a better understanding of this process there are things that we can do to help ourselves.
Extremes: Hyper- and Hypo-arousal (in RED):
Because Hyper- and Hypo-arousal can help to protect us from danger or distress, these states have continued to stand the test of time (i.e., through evolution, we pass on the things that ensure our survival – think ‘survival of the fittest’). However, one unfortunate common consequence of our evolutionary past is that our human brains are easily triggered by ‘false positives’. For many of us, this ‘triggering’ can happen very easily with simple imagery, painful memories and thoughts, or by focusing on threatening judgements or predictions.
This is not our fault. Rather, it is simply how our brains have evolved to protect us. We did not ‘choose’ our emotional learning histories, or to be wired the way that we are. Moreover, we are not designed perfectly. For example, although our brains have immense capacities to protect us from danger (by being able to think about and visualize all that could possibly go wrong), this comes at the cost of ‘false positives’. These are ‘bugs’ (or design flaws) and we need to learn to work with these design flaws, so that we do not get so easily triggered. This also forms part of the preparation work when building our Window of Tolerance (and you can learn more about this by reading about our brain’s Threat System, here).
Dissociation: Coping Beyond the Threshold
Our brains have a threshold for how much distress and/or arousal we can tolerate. Being outside of our Window of Tolerance can lead to “Dissociation,” a literal disconnection or detachment from our conscious awareness (i.e., thoughts, feelings, sensations, memories) and our sense of ‘Self’. Dissociation is a spectrum of disconnection that occurs when distress overwhelms our coping abilities.
In essence, dissociation exists on a continuum. We all dissociate to an extent some of the time. Mild dissociative experiences are common and can happen to almost anyone in response to boredom or stress or certain situations involving low or high arousal (or even tasks involving repetition). This is temporary and can sometimes be a helpful response that can allow our mind to take a break from repetitive or stressful situations or emotions. Examples of mild forms of dissociation may include daydreaming, ‘zoning out’, or getting lost in thought and ‘losing touch’ with an awareness of our immediate surroundings. This is the most common form of dissociation and it rarely interferes with our lives.
Dissociation can also occur following an intense traumatic experience as a natural defense mechanism of the brain that can help us tolerate what might otherwise be too difficult to bear. For example, this may make it difficult to remember the details of a traumatic experience (which may serve as a protective mechanism). In this example, dissociation is essentially a way that our brains have evolved to ‘mentally escape’ from fear, pain or horror.
Dissociation is a huge topic, and one that deserves a separate web-page article, but simply put: Extreme forms of dissociation occur in response to extreme arousal states (low arousal or high) and/or following extreme stress, as a protective mechanism to shield us from physical, psychological, or emotional harm. Because Dissociation is essentially a disconnection from our conscious awareness and our sense of ‘Self’, some may report that they can act in ways that they do not remember; yet, for others, they may not even be aware that they dissociate at all.
At the more extreme end of the dissociative continuum (as is common with people who have experienced Complex Trauma and / or significant childhood adverse events), dissociative states can literally become distinct personality configurations that are cut-off from an individual’s awareness. These personality ‘states’ or ‘parts’ may contain parts of the traumatic memory, or may represent the physical sensations, emotions or the narratives related to those events. Understandably, such shifts in consciousness may involve specific perceptions, attitudes, beliefs, and emotional responses to people and situations that are not typically held by the individual. Again, these dissociative states or ‘parts’ are not our fault. Rather, they may have emerged in response to what happened to us, and are further examples of the clever ways that our brains can evolve to protect us (i.e., to help us mentally escape from fear, pain or horror).
Overwhelm vs Shutdown: The Differing Needs of ‘Too Much’ or ‘Too Little’ Arousal
Often, more extreme forms of dissociation are an indication that an individual is well outside of their Window of Tolerance. This means that it can be difficult for new learning to occur. This can be a problem for a person who is in a dissociated state whilst in a therapy session, because they may not have any recollection of information discussed. Equally, because dissociation can interfere with new learning, this can (for instance) make it very difficult to process memories in trauma therapies such as EMDR Therapy.
Thus, if you are receiving a treatment for trauma, it is very important that your therapist understands how to assess for and work with dissociation (and dissociated ‘parts’ of Self). Dissociation indicates that before doing trauma work, you need to focus on PREPARATION skills to help you expand and stay within your Window of Tolerance. This is crucial for your comfort and safety before proceeding to the ‘treatment phase’ of trauma therapy. Given that dissociation is a natural trauma response, therapists should not overlook assessing for it and adequately preparing you by building resources to keep you within your Window of Tolerance during the therapy process.
How to Increase Your Window of Tolerance
It is important to emphasize that we do not get to choose how ‘wide’ the Window of Tolerance we are born with is; different people are born with different brains and different capacities. Equally, we know that adverse events in early childhood and throughout our lives can shape our brains and can in turn affect our Window of Tolerance. Our attachment styles and early emotional learning also influence how our brains and Window of Tolerance develops.
However, although many of the negative experiences that happen to us (especially the adverse experiences we experience in early childhood) are not our fault – it is our responsibility to learn about how we can best help ourselves, because the ‘wider’ we can expand our Window of Tolerance, the more resilient we can learn to become in the face of life’s challenges.
If you would like to increase your Window of Tolerance, it will first helpful to begin to become aware of the ‘cues’ or the ‘signals’ that you are becoming either Hyper-, or Hypo- aroused. Although everyone is different, it is common for people to report that when they are becoming hyperaroused that they find it increasingly difficult to stay calm. You could use this as a signal that you are coming close to the upper edge of your Window of Tolerance and that you need to intervene.
Another way to think about tailoring your approach to your needs comes from what we know about STRESS. Take a look at the image of the Yerkes-Dodson Law depicted in the diagram below:
As seen in the image above, when we are LOW in stress (eg hypo-arousal) we are going to find it difficult to ‘stay present’ and perform in ways that are optimal. Equally, when we are HIGH in stress (eg hyper-arousal) we are going to find it difficult to perform at our best. What we need is ‘just the right amount’ of stress.
In other words, you need to ‘know where you are at, where you need to be, and what you need to do to get yourself there’. Although different people prefer different approaches, we know that in general, calming imagery and soothing skills (such as Soothing Breathing, creating a ‘Calm Place’, and other calming imagery) and grounding techniques (such as tuning into your 5 Senses, mindful noticing) are generally what is required to bring a person out of hyperarousal back into their Optimal Zone.
On the other hand, a commonly reported signal that you may be entering hypoarousal is that you may be feeling like withdrawing or that you are ‘shutting down’. If this is the case, use this as a ‘signal’ that you are coming close to the edge of your Window of Tolerance and are moving towards the state of hypoarousal. This is a signal that you need to intervene. Grounding skills can be important use when outside of your Window of Tolerance.
“Different-strokes for different folks” applies here though, because while for some people connecting with others can be a useful way to counter their desire to withdraw, for others (particularly those with significant interpersonal traumas) connecting with other people when distressed may be hugely challenging because other people may be either emotionally unavailable / unsupportive in the past or may be perceived as aversive or threatening (which could increase distress). In more extreme cases of hypoarousal, simple gentle but stimulating activities with a focus on grounding your experience in the present moments (i.e., techniques to help orient you to time / place) may be required. Regardless, it is helpful to plan ahead and to have multiple options for how you would like to be able respond (and to have practiced using them) should such a situation should it arise.
Self-Care Strategies for Working with Hyperarousal (‘too much’)
When we’re in a state of hyperarousal — feeling anxious, overwhelmed, or on edge — our Sympathetic Nervous System is working overtime. This is your brain and body trying to protect you (which I discuss further here, but it can leave you feeling stuck in “fight or flight.”
To soothe and regulate, we want to activate the Parasympathetic Nervous System, which promotes safety, calm, and rest. This involves slowing down, grounding, and gently releasing or creating space for the excess energy or emotional intensity.
Because we all respond differently to soothing strategies, it’s important to build a personal toolkit of activities that work for you. Practising them regularly makes them more effective when you need them most.
Some examples may include:
| Category | Examples | Why It Helps |
|---|---|---|
| Breathing & Mindfulness | Deep belly breathing, mindful breathing, being mindful in nature | Regulates vagus nerve, calms the system, connects you to the present moment |
| Expressive Writing | Journaling, drawing, structured speed-writing (e.g. Pennebaker’s infamous Expressive Writing method) | Externalizes thoughts, supports emotional processing and validation |
| Gentle Movement | Yin or restorative yoga, light stretching, rocking on a hammock | Activates parasympathetic response; calms body and mind through slow motion |
| Rhythmic & Physical Release | Stomping, shaking, throwing balls or rocks, bouncing on a trampoline | Releases excess energy; rhythm helps regulate and soothe the system |
| Temperature-Based Regulation | Warm showers, cold water immersion (done safely) | Shifts state quickly via sensory contrast; influences autonomic tone |
| Comfort & Containment | Weighted blanket, cozy space, soft lighting, de-stimulating sounds (below) | Promotes felt safety; supports emotional containment and grounding |
| Pressure & Tactile Input | Rolling on foam roller, yoga ball, deep pressure touch | Relieves muscle tension and brings awareness to the body |
| Nourishment | Comforting food or drink (e.g. warm tea, smooth/chewy snacks) | Soothing textures and warmth support regulation and present-moment focus |
| Sound & Voice | Soothing music, chanting, singing, playing gentle instruments, nature sounds | Sound and vocalization regulate the vagus nerve and emotional centres |
🧘♀️ Tips:
-
You don’t have to wait until you’re overwhelmed to use these strategies. The more you practise them when you’re calm, the more accessible and effective they’ll be when you really need them.
-
We often need to be reasonably well-regulated to even begin using these tools. It helps to plan ahead and identify (by experimenting) what works for you in advance — not in the middle of a crisis. Think of it as preparing a toolkit for your future self.
-
If you experience intense swings between hyperarousal (panic, overwhelm) and hypoarousal (shutdown, numbness), or if you struggle to notice the early signs of distress — this is not your fault. These are powerful protective responses shaped by past experiences.
-
The good news is that regulation skills can be learned. Even taking the time to reflect on what you might need is a meaningful first step. Each time you pause to notice, plan, or practise, you’re already starting to shift how your nervous system responds — building capacity, bit by bit.
-
Self-care strategies can be powerful, but they may not be enough on their own. If that’s the case for you, working with a trauma-informed psychologist can help you build deeper regulation skills and safely process what your nervous system is carrying.
Self-Care Strategies for Working with Hypoarousal
Hypoarousal can leave you feeling flat, foggy, or disconnected. To shift out of this state, the goal is to gently stimulate your body and mind in ways that increase alertness and reconnect you with the present moment.
Because every nervous system is different, it helps to build your own personal toolkit—actions you enjoy and that genuinely help. Practising them regularly makes them easier to access when needed.
What Can Help?
Essentially, anything that stimulates your prefrontal cortex and brings you safely into the present moment is what we are looking for here. in other words, any activity that involves a helpful stimulation of your body / mind or that grounds you in the present moment safely is likely to be useful. Below are some self-care strategies to help you increase your arousal and engagement in the present moment.
Some examples may include:
| Category | Examples | Why It Helps |
|---|---|---|
| Sensory Stimulation | Essential oils, holding ice, crunchy foods, blowing through a straw | Quickly engages the sensory brain and helps anchor you in the present |
| Movement & Physical Play | Dancing, jumping, crawling, walking backward | Raises arousal and demands attention in the moment |
| Body Awareness | Body scan, progressive muscle tension | Reconnects mind and body; builds interoceptive awareness |
| Creative Expression | Finger painting, drawing, playing an instrument | Tactile and emotionally engaging; promotes flow state |
| Stimulating Sounds | Listening or singingto upbeat or emotionally charged music | Activates emotional processing areas of the brain |
| Temperature Shift | Cold showers, holding ice, splashing face with cold water | Provokes a strong physical response that can lift arousal |
| Cognitive Load | 5-4-3-2-1 exercise, naming facts about surroundings | Redirects mental focus and stimulates the thinking brain |
| Meaningful Connection | Calling or messaging someone safe and trusted | Relational safety helps co-regulate your nervous system |
A Note on Trauma & Narrow Windows of Tolerance
If you’ve experienced trauma, you may find yourself shifting into shutdown or emotional overload with little warning. That’s not a flaw — it’s your brain trying to protect you. Unfortunately, this can sometimes take people by surprise and they can lash out at others or themselves, or can completely shut-down, and this may leave a person feeling ashamed or powerless and like they are out of control of their emotions. If this is the case (if this is you, or someone that you care about), please understand that self-help techniques alone will likely only be of limited use.
These reactions might include:
-
Withdrawing or going numb (‘shutting down’)
-
Lashing out in distress (at yourself or others)
-
Feeling powerless or intense shame
If that sounds familiar, self-care techniques may only go so far. Working with a trauma-informed clinical psychologist is highly recommended.
If You’re in Therapy (especially EMDR or DBR)
If you are receiving Therapy – especially EMDR Therapy – and you are working with trauma or painful memories, it is your Therapists’ upmost ethical and professional responsibility to determine what your Window of Tolerance is, and to work safely with you to help teach you what you do not know so that you can develop the skills that you missed learning. That way, the work that you do together will be as efficient and effective as it can be.
A skilled therapist will:
-
Help identify your Window of Tolerance
-
Teach you skills you may not have learned growing up
-
Support you to stay within your capacity so therapy is safe and effective
Summary:
- The Window of Tolerance describes the optimal zone of arousal where we function best — calm, alert, and engaged. When we are outside this zone, we move into Hyperarousal (e.g. anxiety, overwhelm) or Hypoarousal (e.g. numbness, shutdown).
-
We don’t get to choose how wide our Window of Tolerance is to begin with — it’s shaped by brain development, genetics, and early experiences. Early trauma and chronic stress can narrow our window, making us more easily overwhelmed or shut down.
- Although many difficult experiences are not our fault, it becomes our responsibility to learn how to care for and support ourselves. Staying within the optimal zone requires awareness and the ability to attend to ourselves with care and self-regulate our arousal in response to life’s demands. Like a thermostat making small adjustments to keep a room comfortable, we can use strategies to either activate or deactivate ourselves to return to balance.
- With consistent practice, we can expand and strengthen our ability to stay within our optimal zone — even in the face of stress or emotional challenges.
- We can expand our window through learning attending to what our nervous systems need and practising skills to improve our responsiveness to self-care such as mindfulness and self-compassion skills, strengthening safe and supportive relationships, and other healthy lifestyle habits (improving sleep, nutrition, connection to nature & movement, journaling), and engaging in therapy when needed.
-
In trauma therapy (such as EMDR Therapy), therapists have an ethical responsibility to assess for dissociation, ro determine a client’s Window of Tolerance, and to ensure adequate self-regulation skills are in place before beginning trauma reprocessing to prevent re-traumatization.
Further Resources:
- Support your Parasympathetic Nervous System with Soothing Breathing
- How Adverse Childhood Experiences (ACEs) impact on attachment, brain development and later lifestyle and health risk factors
- How childhood attachment experiences affect you and your relationships
- Your brain’s 3 Emotion Regulation Systems
- Getting Past Your Past with EMDR Therapy
- How you can get the most out of therapy
- A list of all articles that I have written
