Psychedelic integration in Barcelona: the therapeutic space after the experience

The term "psychedelic integration" has moved, in just a few years, from the jargon of small therapeutic circles to headlines in the press, clinical trials published in Nature, and everyday conversation. The reason is not only the so-called "psychedelic renaissance" in research, but something more concrete: a growing number of people are having experiences with psychedelic substances — in ceremonial contexts, at legal retreats in other countries, or through intentional self-administration — and finding themselves afterwards with a dense psychological material for which they have no framework.

This article is not about the psychedelic experience itself. It is about what comes after — about what recent clinical research is documenting as possibly the most decisive part of the therapeutic process: integration.

What psychedelic integration is and why therapeutic accompaniment matters

Psychedelic integration is the therapeutic work aimed at transforming the material — emotional, somatic, relational, symbolic — that emerges during or after a psychedelic experience into sustainable changes in everyday life.

Bathje, Majeski and Kudowor (2022) proposed one of the first operational definitions in the scientific literature: integration is the process by which significant contents from an altered state of consciousness are progressively incorporated into an individual's sense of self, relationships and behaviour. It involves reflection, emotional processing, somatic embodiment and, frequently, concrete changes in how life is lived.

It is important to be clear about what it is not. It is not the administration of psychedelics. In Spain, administering or supplying psychedelic substances in a therapeutic context is not authorised (with the very limited exceptions of regulated clinical trials). The psychotherapist who offers integration works with people who have had experiences through other means — legal regulated retreats in countries such as the Netherlands, Brazil, Portugal or Jamaica; traditional ceremonial contexts; or intentional self-administration — and deals with what comes after.

It is not coaching or "counselling." It is therapeutic work, with all its nuances: relational bond, transference, regulation, embodiment, symbolisation. What changes is that the working material includes non-ordinary contents.

The psychedelic renaissance and why integration is the forgotten phase

In recent years, leading research centres — Imperial College London, Johns Hopkins, NYU, MAPS — have published results that have repositioned psychedelics on the clinical map. The study by Davis et al. (2021), published in JAMA Psychiatry, showed effect sizes substantially superior to conventional antidepressants for the treatment of major depression with psilocybin-assisted psychotherapy. Mitchell et al. (2021), in Nature Medicine, documented equally robust results for post-traumatic stress disorder with MDMA.

What is frequently lost in those headlines is that the psychedelic never acts alone. All those protocols include, without exception, structured psychotherapeutic work in three phases: preparation, the session itself, and — above all — integration. Without integration, the data suggests that effects fade over time (Carhart-Harris et al., 2018).

The psychedelic brain: default mode network, depression and emotional reactivation

To understand why integration is decisive, one must first understand what psychedelics do to the brain. Over the last decade, the answer has started to take shape.

Neuroscientist Robin Carhart-Harris and his team at Imperial College London proposed in 2014 the entropic brain model (Carhart-Harris et al., 2014) and later the REBUS model (Relaxed Beliefs Under Psychedelics; Carhart-Harris & Friston, 2019). The simplified idea is that psychedelics temporarily relax the brain's rigid predictive patterns — automatic beliefs, perceptual habits, identity narratives — and open an unusual window of plasticity.

The place where this relaxation is most visible is the default mode network (DMN): a set of brain areas that activate when we are not focused on an external task, and which sustain the narrative sense of self, rumination, self-reference, and mental time travel. Palhano-Fontes et al. (2015), with ayahuasca, and Carhart-Harris et al. (2012, 2014), with psilocybin and LSD, documented that these substances produce a temporary disintegration of the DMN: areas that used to function as a synchronised chorus stop doing so, allowing regions that do not normally communicate to begin "talking" to one another.

Subjectively, that translates into what many describe after a psychedelic experience: the dissolution of the walls of the habitual self, a sense of unity, access to emotional contents that had been blocked, a freer perception — frequently accompanied by deep calm and a surge of creativity.

The connection to depression is direct and clinically significant. Depression is characterised, in neurofunctional terms, by a hyperactivated and rigid DMN, persistent negative rumination and a flattening of emotional response — what the literature calls blunted affect: a measurable loss of the capacity to respond with energy and nuance to positive and negative stimuli.

Two recent studies from the University of Chicago group are particularly relevant here. Molla et al. (2024), in Neuropsychopharmacology, administered a low dose of LSD (26 µg) to people with and without depressive symptoms. The finding, surprising in its specificity: the group with depression reported significantly greater effects on vigour, elation and positive dimensions of altered states of consciousness. They were not more sensitive to the drug in general (plasma levels were equivalent), but selectively more sensitive to its energising and positive effects. Forty-eight hours later, participants with depression showed a significant reduction in their BDI scores compared to placebo.

Glazer et al. (2026), in the Journal of Psychopharmacology, completed the map neurobiologically. Using electroencephalography (EEG) during a reward task, they measured the late positive potential (LPP), a marker of emotional processing. In healthy individuals, LSD produced no changes; in people with depressive symptoms, however, LSD significantly increased emotional responsiveness — including the response to negative feedback — partially reversing the flattening characteristic of depression. And that neural reactivation correlated with subjective mood improvement 48 hours later.

The clinical reading is relevant: psychedelics do not produce a uniform effect — they produce a disorganisation of rigid patterns, and that disorganisation is most useful for those who were trapped within them. In the depressed brain, over-anchored to its own DMN and emotionally flat, opening that window may be precisely what is needed.

What the research says about integration

Wolff et al. (2020), in one of the most comprehensive studies on integration following psilocybin and other classic psychedelic experiences, identified several factors that participants reported as decisive for a good outcome: the presence of an accompanist with a therapeutic framework, a sustained period of follow-up work (not a single "closing" session), contact with the body, conversation with others who have gone through similar processes, and the incorporation of insights into concrete changes in everyday life.

Earleywine et al. (2022), in a study on integration practices among professionals, found notable convergence despite diverse approaches: virtually all therapists worked with three axes — emotional, somatic and narrative — and considered integration a process, not an event.

Watts et al. (2017), in a qualitative study on psilocybin experiences in treatment-resistant depression, documented a clinically relevant phenomenon: participants report that the most significant change is not the euphoria or the extraordinary sensations of the session, but a deeper reorientation of their sense of connection — with themselves, with others, and with something larger. That reorientation is precisely what integration work is needed to sustain over time.

The professional framework in Spain and Barcelona's position

Spain has a specific legal framework for this. The administration of psychedelic substances in a therapeutic context is not authorised except in approved clinical trials. However, integration — therapeutically supporting people who have had experiences through other means — is legal, ethical and increasingly necessary.

Barcelona holds a particular position on this map. It is home to ICEERS (International Center for Ethnobotanical Education, Research and Service), one of the world's most active research centres in the therapeutic use of ayahuasca, ibogaine and other traditional entheogens. The presence of ICEERS, combined with the abundance of communities connected to ceremonial traditions and the proximity to countries where regulated retreats are legal, has generated growing demand in the city for professionals capable of accompanying the integration phase.

Why integration is not optional

It is an observation that clinical practice has been documenting since Stanislav Grof in the 1970s: psychedelic experiences open material — memories, emotions, perceptions, intuitions, pain — that was not previously accessible. If that material finds no space to be processed, one of three outcomes tends to follow.

The first, and most common: the experience fades. The person remembers having felt something important but cannot translate it into change. Six months later, their life is practically identical to what it was before.

The second: the material remains unprocessed and produces disorganisation. This can manifest as the reactivation of old wounds, difficulties regulating emotional states, a sense of no longer fitting into one's previous life. The clinical literature documents this as extended difficulties following psychedelic experiences (Bremler et al., 2023).

The third, the desirable outcome: the experience is processed, anchored in the body, incorporated into everyday life, and produces sustainable change. This is what psychedelic integration therapy aims for.

How I work with integration

My approach combines three traditions that complement one another in this work. Transpersonal psychotherapy, which offers the framework for holding non-ordinary contents — mystical experiences, symbolic encounters, unitive perceptions — without pathologising or mystifying them. Body psychotherapy, which allows the experience to be anchored in the body, where it is often encoded but not yet integrated. And Gestalt therapy, which brings work with the parts and aspects of the self that the experience has touched or released.

In practice, this translates into a process that tends to have three movements. First, a period of regulation: stabilising whatever may have been dysregulated by the experience, recovering the rhythm of the nervous system, normalising residual sensations. Second, a period of elaboration: giving words, gestures and symbols to what was lived; naming what asks to be named; allowing the body to complete the movements that were left unfinished. Third, a period of anchoring: translating what has been learned into concrete changes in how everyday life is inhabited — the body, relationships, work, time.

Duration varies. Some processes complete in six to eight sessions; others extend to several months depending on the depth of the material and the person's pace.

Who comes for integration

Those who come most frequently for this work are not recreational users. They tend to be people who have participated in a legal and regulated retreat, in a traditional ceremony, or in an intentionally therapeutic self-administered process, and who have found themselves afterwards with material that exceeds what they can process alone.

Another common profile is professionals — doctors, psychologists, therapists, researchers — who are exploring these territories from within their own personal process, and who are looking for a professional space in which to speak about the experience without having to justify anything.

And there is a third profile, the most delicate and therefore the most important: people who have come out of a psychedelic experience with significant dysregulation, who need above all to find solid ground before being able to process anything at all.

A closing note: McGilchrist and the gaze of the right hemisphere

Psychiatrist and philosopher Iain McGilchrist (2009), in his work The Master and His Emissary, put forward a thesis that has taken on special significance for understanding work with non-ordinary experiences. The two cerebral hemispheres, he argues, do not specialise in different contents but in different modes of attention: the left abstracts, fragments, categorises, instrumentalises; the right contextualises, integrates, perceives the whole, and sustains the relationship with what is living.

Contemporary culture — and in many cases the psychopathological modes such as depressive rumination, control anxiety or abstract dissociation — has progressively over-privileged the left hemisphere's mode, producing a way of inhabiting the world that is increasingly alienated, rationalised and disconnected from the body. What multiple lines of research suggest — from psychedelic neuroimaging to Allan Schore's work on the right hemisphere in psychotherapy — is that deep therapeutic change is played out precisely in the recovery of that broader, relational and embodied mode of attention.

What psychedelic experiences appear to produce, in functional terms, is a temporary deactivation of left hemisphere dominance and renewed access to the right brain's perceptual mode: the gaze that perceives the whole, that is moved, that recognises what is common between living beings. Therapeutic integration, in this framework, does not consist in filing the experience away as an extraordinary episode, but in learning to keep that right hemisphere gaze accessible once the substance is gone — and in making it compatible with ordinary life.

There is a question that appears in almost every integration process: how is it possible that something lasting six hours could change me this much? The neurobiological answer — the plasticity window, the deactivation of the default network, the reactivation of flattened emotional processing — is one part of the story. The other part is what humanistic psychotherapy has been saying for decades: deep change does not happen through technique or through a substance. It happens when a meaningful experience finds a relational space in which to be processed.

That is the wager of integration. Not to "explain" what was lived, but to hold it long enough for it to become life.