What Actually Happens in a Psychedelic Journey — Part 3: The Mind
Psilocybin doesn't just alter perception or move emotion. It temporarily reorganises how the brain thinks — and that reorganisation is where insight comes from
The mind goes quiet. And then it goes strange
There is a moment in most journeys — not always at the same time, not always announced — when the usual mental noise stops.
Not sleep. Not blankness.
Something closer to a suspension. The constant internal commentary, the planning, the self-monitoring, the low-level hum of self-assessment that most of us live inside without noticing — it lifts.
And in that space, something else becomes possible.
Thoughts arrive differently. Without the usual editorial filter. Without the anxious checking: is this right, is this allowed, what does this mean about me.
Ideas connect that have never connected before.
Things that were confusing become, very, very clear.
Things that felt fixed — beliefs about yourself, about what is possible, about who you are — loosen.
This is the mental dimension of a psychedelic journey. And of the four dimensions covered in this series, it is probably the one most people are thinking about when they imagine what psilocybin does.
It is also the one most likely to be misunderstood.
What insight is and what is happening in the brain
People leave ceremonies saying things like: I understood everything. Or: I finally saw clearly. Or: I had a realisation I had been trying to reach for years.
That is real. But it is worth being careful about what it means.
Insight in a psychedelic journey can be understood as the brain reorganising — temporarily operating in a way that ordinary consciousness does not permit — and in that reorganisation, accessing things that were always there but had been rendered inaccessible by the structure of habitual thought.
The mind stops running its usual loops. And in the gap, something can surface.
Because we need to understand that the brain is not a single thing. It is a collection of networks — systems of regions that normally work in coordinated, well-practised ways.
One of the most important of these is the default mode network (DMN): a system that activates when we are not focused on anything in particular.
It is the network of the self. It runs our inner narrative, manages those thoughts that start with “I am the kind of person that …. ”, decides what our identity is, maintains the story we tell about who we are.
For most of us, it is on almost all the time.
Psilocybin, just like a long term meditation practice, disrupts it.
A 2024 study published in Nature — one of the most detailed brain-mapping studies on psilocybin to date — tracked participants through roughly 18 MRI scans each, before, during, and for weeks after a single high dose. What Siegel and colleagues found was that psilocybin massively disrupted functional connectivity across the brain — and the disruption was strongest in the default mode network. The tightly coupled regions that create our sense of self, of time, of who we are — they desynchronised. The usual signal between them broke apart.
This is not damage. It also is temporary. And it appears to be part of the mechanism.
When the DMN loosens its grip, the boundaries between networks blur. Areas that do not normally talk to each other begin to communicate. The brain enters a state of what researchers now call elevated entropy — not chaos, but a genuine expansion of the range of information the brain can process at once.
A study published in Nature Communications in May 2026 by Lyons, Carhart-Harris and colleagues measured this directly using EEG in people taking psilocybin for the first time.
Within 60 minutes, brain entropy rose sharply.
And here is what made the finding important: the intensity of that entropy spike predicted how much psychological insight participants reported the following day.
And the insight, in turn, predicted improvements in wellbeing and cognitive flexibility two and four weeks later.
These days before ceremony [in the Foundation retreat] cultivate what psychology calls non-judgmental acceptance — and what contemplative traditions call equanimity. Seeing what arises without fusing with it.
When that practice is in the body, the brain remembers it in the psychedelic journey. And in its state of elevated flexibility, a belief held for years can be seen from the outside. And seen from the outside, it can loosen.
This is part of why people report three years of therapy in a day.
What this feels like, from the inside
The word that comes back most often, from people describing the mental experience of a journey, is clarity.
Not the clarity of having solved a problem. Something quieter. A seeing of something that was always there, that had simply not been visible from inside the usual mental structure.
For some people, it is a belief about themselves that turns out to be false — I am not enough, I cannot be trusted, I have to earn my place — that suddenly has no weight.
Not argued away. But simply... emptied of conviction. A knowing outside the mind, rooten in the whole beeing, that it is not true.
For others, it is a pattern — in relationships, in work, in how they respond to fear — that becomes visible in a way it had never been. Not from the inside of the pattern, but from somewhere outside it.
For others still, it is something that cannot quite be put into words. A knowing, arrived at sideways.
That is not the same as a cognitive reframe. It is not insight arrived at by mental analysis as it is done in formal talk therapy.
It is closer to what happens when you finally stand far enough back from a painting to see what it actually depicts.
It is that deep embodied “Aha” moment when what has alway been in front of your eyes is finally revealed.
Why ordinary consciousness cannot do this on its own
The mind in its default state is efficient. That is the point of it.
It uses well-worn paths, confirms existing beliefs, maintains the coherence of the self-narrative. It is, in this sense, designed to stay the same.
The very structure that makes daily functioning possible is also the structure that makes certain kinds of insight very difficult to reach.
This is not a problem unique to working with psychedelics. Therapy, meditation, somatic work — all of them are, in different ways, trying to interrupt the same loops. Trying to create a gap in the habitual mental pattern through which something new can pass.
What psilocybin appears to do — temporarily, not permanently — is create that gap at the neurological level. The networks that maintain the usual mental structure are disrupted. The brain enters a state of higher flexibility. And in that flexibility, the rigid beliefs, the fixed self-concept, the well-defended stories — they become, briefly, less defended.
A 2026 mega-analysis published in Nature Medicine — covering 11 independent neuroimaging datasets across 267 participants, led by Girn and colleagues — found that across multiple psychedelic compounds, the shared signature was increased connectivity between the networks involved in higher-level thinking and those processing sensory and bodily experience.
What this means in simpler panguage is that the thinking mind and the sensing body, normally operating in parallel, begin to speak to each other.
This may be part of why insights in a psychedelic journey so often arrive through image, metaphor, or physical sensation — not as a thought, but as something felt and then understood.
Mental clarity, the naked truth, and how we work with this in the Heart’s Door Retreats
This is a good moment to name something clearly (pun intended ;) ).
The mental clarity of a journey is not always pleasant. The thoughts that surface are not always welcome.
The same loosening that makes insight possible also makes it harder to avoid what has been carefully avoided. Beliefs about the self that were held at a distance become harder to keep at a distance. Things that were not being looked at become, temporarily, impossible not to look at.
This is not a malfunction.
It is the same mechanism, operating in the direction of what needs to be seen rather than what is comfortable to see.
In a well-held ceremony, with preparation that has built safety and trust, this is workable.
Often it is where the most important work happens.
This is also where our preparation becomes directly relevant.
In the days before ceremony, we work with body-oriented practices — and part of what that training builds is the capacity to be with what arises, without immediately reacting to it or identifying with it as truth.
These days before ceremony cultivate what psychology calls non-judgmental acceptance — and what contemplative traditions call equanimity. Seeing what arises without fusing with it.
When that practice is in the body, the brain remembers it in the psychedelic journey. And in its state of elevated flexibility, a belief held for years can be seen from the outside. And seen from the outside, it can loosen.
This is part of why people report three years of therapy in a day.
After the journey
The insights that arise during a ceremony do not automatically translate into lasting change.
We covered this in other posts — the gap between what is seen in a journey and what actually shifts in daily life. The mental effects of psilocybin are part of why integration matters so much. The brain's period of elevated flexibility does not last forever. The window in which new information is most easily incorporated is finite.
What people do with what they saw — how they work with it in the days and weeks that follow — determines whether the insight becomes something that lives in the body and changes behaviour, or remains a vivid memory of something once understood.
“Honestly, the retreat alone, even without the journey itself, would have been worth every cent. Ioana and Imke are extraordinary facilitators who guide the entire experience with authenticity, compassion, and genuine dedication. Under different circumstances, what I experienced might easily have been called a “bad trip.” But because of their loving guidance, I was able to surrender to it. I was allowed to feel the fear I carried inside me and to recognize that the pain I encountered during the experience was my own pain, pain that deserved to be felt.
And once I moved through that phase, it became something indescribably beautiful.”
— Rosa, Foundation retreat, November 2025 [read the full testimonial here]
The fourth and final post in this series covers what many people find the most unexpected dimension of a psychedelic journey: mystical and spiritual experience — what it is, what produces it, and why the research suggests it may be the single strongest predictor of lasting change.
Our Foundation Retreat — 23 to 26 July in the Netherlands — includes careful preparation in the days before ceremony, a guided ceremony held with full presence, and integration support designed to help what surfaces in the journey take root. If you are wondering whether this is the right moment for you, we would love to talk.
Post by co-founder Ioana.
Ioana is a researcher, psychedelic facilitator, and coach whose work sits at the intersection of science, embodiment, and lived experience. She spent years inside academia studying psychedelics, health and wellbeing — and eventually decided the most useful thing she could do with that knowledge was bring it into the room with people, not just onto the page. These posts are her attempt to make psychedelic science accessible and honest — without flattening it into wellness copy or drowning it in jargon.
