The Science of Psychedelics

with Maria Balaet

Computational neuroscientist Maria Balaet explains what psychedelics are, from the history of the word and the 5-HT2A receptor to Albert Hofmann’s first LSD trip and the 1960s shutdown of research. She sets out what psilocybin and LSD do to cognition, creativity, blood flow and the default mode network, and reviews clinical trials for alcohol use, smoking, end-of-life distress and depression. She ends with what predicts a good or difficult experience, the real risks, and the case for harm reduction.

• Why psychedelics were once called psychotomimetics, then hallucinogens
• How psychedelics mimic serotonin and bind to 2A receptors
• What psilocybin does to the default mode network and brain connectivity
• What predicts a good trip: personality, intention, set and setting

with Dr David Luke

Dr David Luke looks beyond the mystical experience measured in clinical trials to the wider range of exceptional experiences psychedelics produce: entity encounters, telepathy, out-of-body states and turning into another species. He presents survey data showing these experiences tend to increase meaning and purpose, move people away from materialist beliefs, and deepen connection to nature and ecological behaviour. He also covers an LSD problem-solving study with top scientists, indigenous ’knowing by becoming’, and the challenging experiences that can unsettle a person’s sense of reality.

• Why the mystical experience predicts clinical outcomes in psychedelic therapy
• Stanislav Grof’s three categories of transpersonal experience
• How DMT entity encounters and psychedelics shift atheism and metaphysical beliefs
• Why every surveyed psychedelic user felt more connected to nature

with Dr Chris Timmermann

Dr Chris Timmermann explains how psychedelics can serve as a scientific tool for studying consciousness by perturbing the self, time and space. He covers brain findings on ego dissolution, EEG and fMRI studies of injected DMT, a new 30-minute DMT infusion study that tracks what happens in the brain during entity encounters, and early work on 5-MeO-DMT as an experience stripped to its bare bones.

• How psychedelics deconstruct the ‘natural attitude’ and reveal perception as construction
• Which brain circuits are linked to ego dissolution
• Why DMT wipes out alpha waves and produces geometric visions
• How 5-MeO-DMT differs from DMT, including non-dual ‘everything and nothing’ states

with Sarah Tilley

Psychedelic guide and therapist Sarah Tilley introduces psychedelic mindfulness, the preparation method she created for psychedelic-assisted therapy. She explains set, setting and integration and why mindfulness and psilocybin affect overlapping brain regions. She shows how intention, visualisation, music and breathwork prepare you for a journey, and leads live breathing and inner-child visualisation exercises.

• What set, setting and integration mean in psychedelic therapy
• How mindfulness and psilocybin act on overlapping brain regions
• How to set a clear intention and use creative visualisation
• A guided ocean-breath and heart visualisation practice to try yourself

with Rebecca Harding

UCL PhD researcher Rebecca Harding traces magic mushrooms from ancient cave art and María Sabina to Albert Hofmann’s isolation of psilocybin, and explains how psilocin acts on the serotonin 2A receptor and how SSRIs differ. She walks through the Imperial College London studies she worked on, including the double-blind trial comparing psilocybin therapy with escitalopram, its brain-imaging findings and the ‘plastic brain’ theory of how psychedelics may work. She closes with the Compass Pathways trials, Australia’s approval and where psilocybin is now legal, followed by audience questions on training, microdosing and chronic pain.

• How psilocin acts on the serotonin 2A receptor, versus SSRIs
• What the Imperial psilocybin-versus-escitalopram trial actually found
• Why set, setting and psychological support shape the outcome
• Why microdosing hasn’t yet beaten placebo in clinical studies

with Dr Mourad Wahba

Consultant psychiatrist Dr Mourad Wahba traces the word ‘psychedelic’ from Huxley and Osmond’s rhyming letters, then sets out how psilocybin therapy is delivered and what trials show so far. He weighs the competing explanations for how psychedelics work, from 5-HT2A activation, brain desynchronisation and predictive processing to neuroplasticity, inflammation, mystical experience and a reopened critical learning period, before turning to MDMA-assisted therapy for PTSD, the window of tolerance and why the FDA rejected it.

• How 5-HT2A agonists desynchronise the brain and loosen rigid predictions
• Why neuroplasticity, inflammation and mystical experience may all play a role
• How MDMA opens the ‘window of tolerance’ for processing trauma
• The blinding and misconduct issues behind the FDA’s MDMA rejection

with Tommaso Barba

Tommaso Barba explores psychedelics as possible ‘love drugs’, tracing the idea from love potions and the summer of love to new research at Imperial College London. He presents findings that high-dose psychedelics, and psilocybin therapy compared with escitalopram for depression, are linked to lasting gains in sexual pleasure, communication and body satisfaction, and explains why through mindfulness, connectedness and attachment. He closes with early research on couples taking psychedelics together and the ethics of pharmacologically influencing love.

• Why MDMA, psilocybin and ketamine belong to different classes of psychedelic
• How psilocybin and SSRIs differ in their effects on sexual function
• How mindfulness, connectedness and attachment may explain better sexual satisfaction
• The ethical risks of using drugs to strengthen romantic love

with Darren Le Baron

Ethnomycologist Darren Le Baron explores claimed links between psychedelics and the three Abrahamic religions, from the Sumerian creation tablets and a Central African mushroom creation myth to the acacia tree, the burning bush and manna as ergot or mushrooms. He connects Christian ritual — the three wise men, holy communion, Christmas and Vatican symbolism — to Egyptian figures such as Bes and Ptah, while flagging which Christmas-mushroom stories other researchers dispute. He closes with harmala, truffles and DMT in Islamic tradition and sacred plant use in other faiths.

• How Terence McKenna’s stoned ape theory links mushrooms to human evolution
• Why acacia trees, DMT and manna recur in biblical stories
• The claimed mushroom symbolism in holy communion, Christmas and Vatican dress
• How harmala, truffles and DMT appear in Islamic tradition

with Dr Sam Gandy

Dr Sam Gandy examines how psychedelics may act as ‘catalysts of connection’, from new synapses and a globally interconnected, more ‘mycelial’ brain state to closer bonds with other people and the natural world. He reviews the research on nature connectedness, including his pooled analysis of five datasets in which psilocybin mushrooms were the only reliable positive predictor, an ayahuasca retreat study in the Peruvian Amazon, and psilocybin data showing no drop-off between three and six months. He then makes the case for nature-enriched settings, group-based aftercare, wider access to land and beaver reintroduction alongside psychedelics.

• What nature connectedness is and why it predicts wellbeing
• How psychedelics make the brain more globally interconnected and network-like
• Why psilocybin stands out from LSD, ayahuasca and ketamine
• Practical ways to sustain connectedness after a psychedelic experience

with Dr Simon Ruffell

Psychiatrist Dr Simon Ruffell explains how ayahuasca may help heal trauma, from a biological, psychological, social and spiritual point of view. He sets Western mechanisms (serotonin, neuroplasticity, epigenetics, reprocessing memories, catharsis, the overview effect) alongside the Shipibo idea of energetic patterns and master plant spirits. He then presents early results from his ceremonial ayahuasca study with military veterans with PTSD in the Peruvian Amazon, and closes with the ethics of ayahuasca spreading around the world.

• How ayahuasca may reset serotonin, neuroplasticity and stress-related gene expression
• Why traumatic memories can be reprocessed when the prefrontal cortex stays online
• How Shipibo healers understand illness, icaros and master plant dietas
• Early PTSD, EEG and ethics findings from an Amazon veterans study