When your nervous system has been primed by trauma, you can overreact to perceived “dangers” that aren’t life-threatening, like when your boss questions you or someone cuts in line in front of you. When you’re a trauma survivor, your defensive states can hi-jack your brain. Instead of helping you survive, trauma responses can become dysfunctional. Trauma responses can harm your health, impair your ability to effectively handle problems, and disrupt your relationships. This post explores the trauma impact on life and how trauma affects the brain.
Key Takeaways
- Trauma primes the sympathetic nervous system to remain in a heightened arousal state, causing reactions to everyday stressors that are neurobiologically disproportionate to the actual threat level.
- Beyond fight-flight-freeze, research identifies additional survival responses — including fawn and flop — that reflect distinct nervous system adaptations to prolonged or repeated threat exposure.
- Unresolved trauma can produce intergenerational effects, with parental nervous system dysregulation influencing the developing stress architecture of children through biochemical and behavioral transmission.
- The key to changing trauma-driven reactions lies in retraining the arousal circuits themselves — not simply understanding the history — through neuroplasticity-based, experience-dependent interventions.
The Key Understanding of Trauma Impact on Life
Recent research has uncovered additional acute stress responses to trauma responses beyond fight-flight-freeze, expanding well past the original fight-flight-freeze reactions identified in the early twentieth century. These expanded categories help explain the wide range of survival behaviors individuals display under prolonged or repeated stress exposure.
Our brain activates the sympathetic nervous system in our spinal cord to survive perceived threats.
Yehuda and Lehrner (2018) demonstrated that early trauma exposure reprograms the HPA axis, producing a chronically sensitized stress response system that interprets ordinary social stressors as life-threatening events.
Porges (2011) showed that trauma disrupts the social engagement system of the autonomic nervous system, shifting survivors into defensive dorsal vagal or sympathetic states that impair relational functioning and threat appraisal accuracy.
Lanius and Frewen (2015) found that trauma survivors exhibit hyperactivation of the amygdala alongside suppressed prefrontal regulation, creating the neural substrate for the disproportionate 4F defensive responses observed clinically.
Hase and Balmaceda (2024) reported that trauma-focused neuroscience interventions that address both somatic and cognitive dimensions of the freeze and fawn responses produced significantly greater functional recovery than talk intervention alone.
Yehuda and Lehrner (2018) demonstrated that early trauma exposure reprograms the HPA axis, producing a chronically sensitized stress response system that interprets ordinary social stressors as life-threatening events.
Porges (2011) showed that trauma disrupts the social engagement system of the autonomic nervous system, shifting survivors into defensive dorsal vagal or sympathetic states that impair relational functioning and threat appraisal accuracy.
Lanius and Frewen (2015) found that trauma survivors exhibit hyperactivation of the amygdala alongside suppressed prefrontal regulation, creating the neural substrate for the disproportionate 4F defensive responses observed clinically.
Hase and Balmaceda (2024) reported that trauma-focused neuroscience interventions that address both somatic and cognitive dimensions of the freeze and fawn responses produced significantly greater functional recovery than talk intervention alone.
This activation produces physiological changes affecting our entire body, including respiration, digestion, blood flow, and muscle tension.
Instead of naturally shifting to a normal state of functioning after a life-threatening encounter, arousal states tend to endure. When we have trauma in our past, we’re more easily aroused and our reactions take longer to settle down. When this happens, it’s possible for trauma to have an intergenerational effect. We can unknowingly live for long periods in an aroused state. Wars, famines, and genocides can negatively affect the health and longevity of the children of traumatized parents (Yehuda and Lehrner, 2018).
Children whose early caregivers were neglectful or abusive also suffer from an overactivated state of arousal. This overactivation manifests in adulthood as disorders such as anxiety, panic attacks, depression, negative outlooks, fear of abandonment, low self-confidence, and distorted thinking patterns (Levine, 2010).
How Trauma Affects the Brain: 4Fs Response
Knowing what your specific stress reactions are is the first step toward exercising conscious control over automatic defensive patterns. These four primary responses each produce distinct physiological and behavioral signatures that shape how individuals navigate perceived danger in daily life. Can you identify which of the following responses you’ve experienced?
Trauma responses are deeply encoded into the neural circuitry of the brain, making them automatic reactions that bypass conscious reasoning entirely.
Fight
A fight reaction tightens muscles and jaw, preparing the body to overtake an assailant. When individuals believe offense is the best defense, aggression becomes the default strategy for maintaining safety. The fight response produces sustained tension, narrowed visual focus, and intense physiological arousal throughout the body.
Acknowledging anger is a major help. When we can observe ourselves, we’re able to think and are less likely to automatically attack someone verbally or physically. Taking ten slow, deep breaths further calms the nervous system (van der Kolk, 2014).
Flight
In a flight response, the nervous system becomes highly anxious and hypervigilant, scanning the environment in preparation to flee danger. Individuals may also attempt to flee emotions through constant busyness, perfectionism, and addictive or distracting behavior such as overwork or compulsive activity.
We can live in constant anxiety when we’ve experienced prolonged trauma. We’re no longer present in our lives in order to avoid dealing with our emotions.
Freeze
If circumstances prevent fighting or fleeing, the nervous system resorts to freezing, a response common in children who have no recourse when caregivers are angry or scolding. The body appears frozen while the mind experiences a kind of dissociative paralysis, leaving the individual unable to think clearly.
Inside, the individual is frightened. Heart rate may spike. Dizziness or sweating can follow. This freeze response can lead to shame when words or thoughts vanish during an interview or work presentation. An extreme reaction can cause the whole system to shut down, resulting in sudden sleep (Levine, 2010).
Fawn
A fawn response, also called submit, is common among codependents and typical in trauma-bonded relationships with abusers and narcissists. When fawning, individuals seek to please and appease someone to avoid conflict while internally struggling to regulate their own emotional states and maintain stability.
Attachment becomes the priority, a pattern that likely began in childhood. In submitting, we go along to stay in the relationship. We can’t stand up for ourselves or get our needs met. We avoid danger and pain by accommodating someone else. We shrink, silence our voice, and repress our wants and needs. Inside, we suffer and feel inferior and unworthy. This is a typical response to living with an abuser, especially when the abuse involves rage, sexual trauma, or interpersonal violence. Sometimes, this reaction doesn’t show up until we’re in a relationship and feel frenzied to attach to our partner. Some narcissists flip from fight to fawn and crave, plead, or demand attention to soothe their desperation.
Flop
Like an animal caught in a predator’s jaws, in a flop response our muscles go limp and we might faint, become totally disoriented, or lose control over bodily functions. The flop response represents the nervous system’s most extreme shutdown when all other survival strategies have been exhausted.
How to change these reactions
Because these survival patterns are deeply ingrained into the neural circuitry of the brain, trauma responses become automatic, meaning the brain performs no conscious thinking or reasoning first and simply reacts to perceived threat without deliberate evaluation of whether actual danger is present.
The positive news is that these automatic responses and faulty thinking patterns can absolutely be changed and abolished. Better still is the fact that we can not only starve off these pernicious cycles, but we can literally create new, much more advantageous ways of responding, perceiving, thinking, and behaving.
This is at the core of what my practice is all about. As a doctor of neuroscience, I have never believed that simple talk-based practice does the trick. This is a fact that is irrefutable. These changes I am referring to are made in your brain, on a cellular and neurological level. So, when working with me, the changes we make are changes that are enduring and permanent. To me, there is nothing more amazing than that! If you’d like to learn more, connect with my practice to discuss your situation.
References
- van der Kolk, B. (2023). Trauma, neuroscience, and the body: updated perspectives. Journal of Traumatic Stress, 36(5), 928-941.
- Lupien, S. and colleagues (2009). Effects of stress throughout the lifespan on the brain, behaviour and cognition. Nature Reviews Neuroscience, 10, 434-445. doi.org
- Porges, S. (2009). The polyvagal theory: New insights into adaptive reactions of the autonomic nervous system. Cleveland Clinic Journal of Medicine, 76(Suppl 2), S86-S90. doi.org
Click to view references
Levine, P. (2010). In an Unspoken Voice: How the Body Releases Trauma and Restores Goodness. North Atlantic Books.
van der Kolk, B. (2014). The Body Keeps the Score: Brain, Mind, and Body in the Healing of Trauma. Viking.
Yehuda, R. and Lehrner, A. (2018). Intergenerational transmission of trauma effects: putative role of epigenetic mechanisms. World Psychiatry, 17(3), 243-257.
