Psychedelics and Therapy: Why the Two Belong Together

The field of psychotherapy is having a kind of renaissance right now, and psychedelics are a meaningful part of that. What excites me most is that it means we have more tools for deeper and more lasting change than we have ever had before.

Ketamine assisted psychotherapy, or KAP, is one of the most promising of these developments. It is being used with increasing success for treatment resistant depression, anxiety, PTSD, and a range of other conditions where traditional approaches have hit a ceiling. But one question I sometimes hear is “why does the therapy component matter so much? Can the medicine not do the work on its own?”

The answer has everything to do with how the brain actually changes.

Your Brain Has a Default Setting

Your brain has a network responsible for maintaining your sense of self, your internal narrative, your habitual ways of seeing yourself and the world around you. It is called the default mode network, and for most people it is pretty dominant. This is why our patterns, our defenses, our deeply held beliefs about who we are and what we deserve, tend to feel so fixed and so hard to shift even when we consciously want them to.

Think about how hard it is to genuinely change a long held belief about yourself, not just intellectually but in a felt way. That difficulty is not a personal failing. It is the default mode network doing exactly what it was designed to do: keeping your internal world stable and consistent.

The problem is that stable and accurate are not the same thing. Many of the beliefs and patterns running underneath our daily lives were formed during difficult or overwhelming moments, often in childhood, before we had the resources to make sense of what was happening. The brain locked those in, and the default mode network has been faithfully maintaining them ever since.

What Ketamine Actually Does

Psychedelics like ketamine temporarily quiet the default mode network. And in that window, something remarkable happens. The usual rigidity softens. The brain becomes open in a way it genuinely is not during ordinary waking life, more receptive to new experiences, new perspectives, and new ways of relating to itself.

What people often describe during a ketamine session is exactly what you would expect from that shift. The inner critic goes quiet, the habitual mental loops settle, and there is a felt sense of spaciousness that can be genuinely unfamiliar. For someone who has lived with chronic depression, rumination, or self-criticism, that quiet can feel like relief in a way that is hard to even put into words.

Neuroimaging research supports what clients describe. Studies show that ketamine reduces functional connectivity within the default mode network, creating what researchers describe as a window of increased psychological flexibility in which old patterns loosen and new perspectives become accessible. This window also appears to involve enhanced neuroplasticity, meaning the brain is not just more open during the session itself but more capable of forming new neural connections in the days that follow.

Why the Therapy Component Is Essential

This is where the therapeutic work becomes essential, and where ketamine assisted psychotherapy differs meaningfully from ketamine infusions alone.

That window of openness is an opportunity, but it does not do the work on its own. The default mode network will return to its usual activity. The question is what happens in the time between. If the experience is not met with skilled therapeutic support, the window can close without much having changed at a deeper level. The relief may have been real, but the underlying patterns, the beliefs, the emotional learning, the places where the old self-concept lives, remain largely untouched.

With skilled therapeutic support, that same window becomes something different. What surfaces during the experience can be received, explored, and integrated. New experiences of yourself and of the world, ones that contradict old painful beliefs, can actually land in a way they often cannot during ordinary consciousness. This is what allows the temporary shift to become something more lasting.

In my work, I bring the same depth-oriented approaches I use in individual and couples therapy into the KAP space. The goal is never symptom management alone. It is to help the deeper emotional learning, the places where the old map of the world still lives, actually update. Ketamine creates conditions for that kind of change that are genuinely hard to access otherwise. The therapeutic work is what you do with those conditions once you are inside them.

A Note on What This Is and Is Not

Ketamine assisted psychotherapy is not a magic solution, and it is not right for everyone. But for people who have done years of good therapeutic work and still feel stuck, or who have tried multiple approaches without lasting relief, it represents something genuinely new: a way of accessing the brain's own capacity for change that we have not had before.

This is exactly the kind of development that keeps me endlessly curious about the brain and what becomes possible when we work with it instead of against it.

Reference: Forsyth, A., et al. (2020). "Ketamine effects on default mode network activity and vigilance: A randomized, placebo-controlled crossover simultaneous fMRI/EEG study." Human Brain Mapping, 41, 107-119. https://doi.org/10.1002/hbm.24791