Depression

Depression appears here not simply as a deficit of order or vitality, but as a condition in which thought can become too ordered around the self: repetitive, constricted, and difficult to escape. The book links this inward narrowing to a hypothesis about the Default mode network and explores whether psilocybin can temporarily loosen its grip. In accounts from patients and volunteers, the possibility of relief is registered not only as a change in mood but as renewed access to other people, the senses, and a wider world. Yet the respite often fades, leaving both its limits and its remembered possibility in view.

Depression as an Excess of Order

In Robin Carhart-Harris’s account, ordinary self-reflection and reality-oriented reasoning depend in part on the Default mode network, a regulatory system that helps sustain a coherent sense of self. At the low-entropy end of his proposed spectrum, depression sits alongside addiction, obsessive-compulsive disorder, rigid thinking, anesthesia, and coma. Psychedelic states, infant consciousness, early psychosis, magical thinking, and divergent or creative thought occupy the high-entropy end. The spectrum is a model of differing degrees of constraint, not a claim that those states are interchangeable.

The model reverses a familiar assumption: some psychological disorders may involve an excess of order rather than a lack of it. When self-reflective habits deepen into rigid grooves, the ego can become overbearing. In depression, Carhart-Harris suggests, the mind may turn its attention relentlessly inward, and introspection can shade into rumination until awareness of the outside world is diminished. Research he cites points to possible hyperactivity in the Default mode network as one contributor to this process. The result is not merely sadness, but a self-reinforcing pattern of attention that can make alternative thoughts and perspectives increasingly difficult to reach.

Alison Gopnik describes a related pattern: people can become fixed on the same thought, obsessive, and perhaps addicted to the loop. She considers it plausible that a psychedelic experience could create an opening in which a person’s established account of who they are might be revised. Her image is a burst of noise introduced into a system that has become locked; Carhart-Harris’s related metaphor is a snow globe shaken to raise the system’s entropy. In this framework, temporarily disrupting entrenched patterns is not an end in itself. It may create room for a less constricted mode of thought.

From Theory to a Clinical Pilot

After publishing his entropy paper, Carhart-Harris sought to test the implications of the theory in patients. His laboratory, previously focused on basic research, expanded into clinical work. David Nutt obtained a U.K. government grant for a small pilot study examining whether psilocybin might relieve treatment-resistant depression: depression that had not responded to usual therapeutic protocols and drugs. The shift put a theoretical account of rigid thought into a clinical setting, where the question was whether loosening such patterns could matter to people living with persistent illness.

The book does not present the proposed mechanism as proof that psilocybin reliably cures depression. Rather, it sets out a rationale for study: if depressive suffering is partly maintained by narrow, repetitive patterns, a temporary disruption might make psychological change possible. The clinical question therefore extends beyond what happens during a session. It includes whether participants can carry a different relation to their thoughts, feelings, and lives into the months that follow.

Disconnection and the Return of Experience

At Imperial College London, Rosalind Watts interviewed volunteers six months after treatment to understand how the sessions had affected them. Their accounts organized depression around disconnection: from other people, earlier versions of themselves, bodily senses and feelings, core beliefs, spiritual values, or nature. Some described being imprisoned by their own minds or caught in endless circles of rumination. One volunteer could recognize intellectually that orchids were beautiful without experiencing their beauty. The detail makes the impairment concrete: perception remained available as information while feeling seemed absent from it.

For many volunteers, the psilocybin experience seemed to loosen that confinement, at least for a time. One woman reported that the month after her session was her first period without depression since 1991. Others described their thinking as less ruminative and more ordered in context. Several also reported a renewed sensory connection: after a veil seemed to lift, plants appeared beautiful again, and one volunteer said that this capacity to feel the beauty of orchids had endured. The accounts suggest that change was not limited to a report of improved mood; it could involve a different experience of thought and a restored capacity to feel the surrounding world.

The contrast is especially striking because depression had been described as a condition of disconnection. A session that temporarily makes room for other thoughts may also make room for attention to move outward: toward senses, living things, and relationships. The book’s account of cancer patients offers a parallel interpretation. In terminal illness, existential distress can narrow a person’s horizon and intensify inward rumination; psilocybin may, for some, loosen the ego’s boundaries and make connection more available. That discussion does not establish that depression and end-of-life distress are the same condition. It shows how the book relates distinct forms of suffering through the recurring pattern of inward contraction and possible reconnection.

Relief, Return, and What Persists

The improvement described in the pilot was not necessarily permanent. Ian Rouiller experienced several months of relief and a broader perspective on his life, but the overview eventually faded and he returned to Zoloft. A year later, he reported that the vividness of life had diminished and his depression had returned. Still, he was doing better than before, had been able to hold down a job, and retained insights from the trial. When another session at Imperial College London was unavailable, he sometimes meditated and listened to the session playlist, which helped him recover something of that state.

More than half of the Imperial volunteers eventually saw their depression return. The book therefore raises the possibility that, if psychedelic therapy proves useful and receives approval, treatment may not be a one-time intervention. The proposed comparison is to a system reboot or defragmentation: an intense disturbance that may need repeating, though whether repeated treatment works as well remains an open question. Temporary relief still mattered to participants because it showed them that another way of being was possible, and worth trying to regain. The distinction is important: a benefit can be real without being permanent, while duration remains central to judging a treatment.

A Clinical Aim and a Wider Question

Watts believed the approach could transform mental-health care, and the researchers described in the book were hopeful about its promise. That hope sits alongside a broader question about whether psychedelic experiences might matter only to people who are ill. Roland Griffiths initially treated the prospect of using them for the betterment of well people as culturally dangerous to promote, but over time came to believe that their potential should not be restricted to patients with cancer, depression, or addiction. His caution reflects the tension between a therapeutic claim and a larger claim about spiritual experience; neither erases the need for evidence about safety, benefit, and lasting effects.

Depression gives the book’s account of psychedelic therapy its clearest test of the relationship between disruption and recovery. If suffering is sustained by closed loops of attention, a temporary opening may offer more than symptom relief: it can restore contact with feelings, senses, and relationships that had seemed inaccessible. But the return of depression in many volunteers prevents that possibility from becoming a simple cure narrative. The lasting significance may lie partly in the memory of another mental state—a reminder that the prison of rumination is not the only way a mind can inhabit the world.