Is Somatic Therapy Evidence Based? What the Science Actually Says

The short answer is yes. Somatic therapy is evidence based. But the longer answer is more interesting, because the research behind it touches on some of the most significant shifts in how neuroscience, psychology, and trauma science understand the human body and nervous system. And for women of color who have spent years being told their exhaustion is just stress, their physical symptoms are just anxiety, and their pain is just in their heads, that science is not just academic. It is validating in a way that goes bone deep.

I am Chelsey Reese, and at Power Through Process I work with women who are ready to stop surviving and start healing at the level where they actually live. If you want to understand more about my approach, you can explore my somatic therapy approach.

The science behind somatic therapy rests on three interconnected frameworks: polyvagal theory, implicit memory, and neuroplasticity. Together, they explain not just why the body holds trauma, but why working with the body is often the most direct path toward releasing it.

Polyvagal theory: understanding safety, connection, and the nervous system

Polyvagal theory was developed by neuroscientist Dr. Stephen Porges, and it fundamentally changed how clinicians understand the relationship between safety and healing. At its core, the theory describes how the autonomic nervous system, the part of your nervous system that operates below conscious thought, is constantly scanning the environment for cues of safety or threat. Porges called this process neuroception: your body's automatic, unconscious assessment of whether the world around you is safe enough to relax into.

The autonomic nervous system operates in three primary states. When you feel safe and connected, you are in the ventral vagal state: regulated, present, able to engage with others and with yourself. When threat is detected, the system shifts into sympathetic activation, the fight or flight response, characterized by anxiety, hypervigilance, and a body that is mobilized and braced. When the threat feels inescapable or overwhelming, the system drops into dorsal vagal shutdown: the freeze, the collapse, the numbness, the going through the motions of life without really inhabiting it.

For women who grew up in environments where safety was conditional, where expressing emotions had consequences, where strength meant suppression, the nervous system does what it is designed to do: it adapts. It learns to default to sympathetic activation or dorsal shutdown because those states kept you protected. The problem is that the nervous system does not automatically update when the environment changes. You can be decades removed from the original conditions and still be running the same protective patterns in your body.

This is why insight alone does not move the needle. The ventral vagal state, the state required for genuine presence, connection, and healing, cannot be accessed through thinking. It has to be accessed through the body, through breath, through the slow and careful practice of teaching your nervous system that safety is actually available now. That is precisely what somatic therapy does, and polyvagal theory gives us the neurological map for why it works.

Implicit memory: emotions and memories live in the body

The second framework is implicit memory, and it answers one of the most common questions I hear: why do I keep reacting in ways I do not consciously choose?

Memory is not a single system. Explicit memory is the kind you can consciously recall: the narrative, the details, the story of what happened. Implicit memory is different. It is the body's memory: the emotional responses, the survival reflexes, the physical patterns that were encoded below conscious awareness and get activated without your permission. Implicit memory does not announce itself. It shows up as the stomach that knots before you speak up in a meeting. The shoulders that rise when someone raises their voice. The impulse to shrink, to smile, to make yourself smaller in rooms where you feel unsafe.

Dr. Bessel van der Kolk's research made this visible in a way that changed the field. His brain imaging studies showed that when trauma survivors were triggered, the parts of the brain responsible for language and narrative processing went quiet, while the subcortical survival structures lit up. The person was no longer in the present moment. They were in their body, in the response, in the past. This is the neurological basis for why talking about trauma has limits: when the prefrontal cortex goes offline during activation, language becomes inaccessible. The experience is not being processed through words. It is being processed through sensation.

Van der Kolk's conclusion, laid out in The Body Keeps the Score, was that effective trauma treatment must engage the body directly. Not because the mind does not matter, but because the body is where the memory lives. Somatic therapy works with implicit memory by helping you track and process what is held in sensation, posture, and physical response, at the level where it is actually stored.

For women of color, this framework carries particular weight. The hypervigilance, the self-protective collapse, the chronic muscle tension, the inability to rest: these are not personality traits. They are implicit memories, shaped by personal experience, by cultural conditioning, and by intergenerational patterns passed down through bodies that had to survive things that were never fully healed. Resmaa Menakem, therapist and author of My Grandmother's Hands, writes about this directly: racialized trauma is not only psychological. It lives in the body as somatic memory, transmitted across generations through the nervous system adaptations of those who came before us. His work brings the science of implicit memory into direct conversation with the lived experience of Black women and women of color, and it is essential reading for anyone doing this work.

Neuroplasticity: the brain and body can learn new patterns

If polyvagal theory explains how the nervous system gets stuck, and implicit memory explains where trauma is stored, neuroplasticity is the science of why healing is possible at all.

Neuroplasticity refers to the brain's ability to reorganize itself by forming new neural connections throughout life. The brain is not fixed. It is responsive, and it changes based on what it repeatedly experiences. This is the biological foundation for every form of therapeutic change, including somatic therapy.

Brain mapping studies have shown that the parts of the brain most significantly affected by trauma are the prefrontal cortex, the insula, and the anterior cingulate cortex. In brains that have been exposed to significant trauma, these centers show reduced activation. They are quieter than they should be. The prefrontal cortex, responsible for rational thought, perspective, and self-regulation, goes offline more easily. The insula, which processes interoceptive signals from the body, becomes less reliable. The anterior cingulate, which helps integrate body sensation with emotional awareness, loses connectivity.

Here is what makes this particularly significant: the neural pathways leading to these brain centers are predominantly afferent. That means the signal travels from the body to the brain, not the other way around. The body is talking to the brain far more than the brain is talking to the body. This is not a metaphor. It is anatomy.

What this means in practice is profound. When we engage the body through interoception, which means paying mindful, nonjudgmental attention to internal physical sensations, we are directly stimulating the neural pathways that lead to those quieter brain centers. We are, quite literally, rewiring them. Studies on somatic and mindfulness based practices have shown that consistent interoceptive practice causes measurable changes in the insula and prefrontal cortex: those brain centers begin to light up again. The capacity for self-regulation, emotional awareness, and present-moment presence is not lost. It is waiting to be reactivated through the body.

This is the neurological argument for somatic therapy in its most direct form. If trauma quiets the brain centers responsible for regulation and integration, and if those centers are predominantly activated by signals from the body, then the most direct path to healing runs through the body. Not around it.

What the clinical research shows

Beyond the theoretical frameworks, the clinical outcomes research on somatic modalities is substantive and continues to grow.

EMDR, which incorporates somatic awareness through bilateral stimulation and body tracking, is recognized as an evidence-based treatment for PTSD by the World Health Organization.

Research on breathwork has demonstrated measurable reductions in cortisol, improvements in heart rate variability, and shifts from sympathetic to parasympathetic nervous system activation. Research on body scan practices has shown reductions in anxiety, depression, and chronic pain alongside improvements in interoceptive awareness and emotional regulation.

The evidence does not claim that somatic therapy works for everyone in every situation. It demonstrates that body-centered approaches produce real, measurable changes in the nervous system, in trauma symptoms, and in overall wellbeing, particularly for those for whom talk therapy alone has not been sufficient.

Your body is not overreacting. It is responding.

The science is clear, and it says what many of us have felt for a long time: the body is not separate from healing. It is where healing has to happen. The tension, the hypervigilance, the inability to rest, the chronic symptoms that do not resolve no matter how much you understand them intellectually: these are not signs that something is permanently wrong with you. They are signs that your nervous system has been doing its job under extraordinarily difficult conditions, and that it is ready, with the right support, to learn something new.

You do not have to keep carrying this alone. If you are ready to explore what somatic therapy can open up for you, I am here. Learn more about working together through somatic therapy in Los Angeles.