
On Being with Krista Tippett Gül Dölen — Psychedelic Science and Radical Healing
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Mar 5, 2026 Gül Dölen, a neuroscientist studying critical periods and psychedelic-assisted therapies, talks about how psychedelics can reopen brain learning windows. She explains differences among MDMA, ketamine, LSD and ibogaine. Short conversations cover safety, integration, therapist training, ethical stewardship of indigenous practices, and surprising lab experiments like MDMA in octopuses.
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Psychedelics Reopen Learning Windows Not Just Serotonin Fixes
- Psychedelics work by reopening learning windows rather than just fixing a biochemical imbalance.
- Gül Dölen explains this contrasts with the SSRI model and explains durable change after one to three psychedelic-assisted sessions.
Closed Critical Periods Explain Why Brain Diseases Resist Treatment
- Critical periods are time-limited developmental windows for learning (language, vision, social).
- Dölen links therapy failures to interventions after relevant critical periods have closed, explaining difficulty curing many brain disorders.
Use Therapy And Practice To Lock In Psychedelic Gains
- Pair psychedelic doses with structured therapy and post-trip practice to lock in new learning.
- Veterans reported the real work began the day after the trip when they practiced insights to avoid relapse.

