Key Moments
Rethinking Psychedelics, Octopuses on MDMA, and The Master Key of Metaplasticity | Dr. Gül Dölen
Key Moments
Psychedelics may act as a 'master key' to reopen critical periods for learning and plasticity.
Key Insights
Critical periods are windows of heightened sensitivity in the brain for learning specific skills, which normally close over time.
Psychedelics like MDMA, LSD, psilocybin, and ketamine show potential in reopening these critical periods across various brain functions.
This 'reopening' mechanism could offer new therapeutic avenues for conditions like autism, stroke, and potentially allergies, by pairing psychedelics with existing treatments.
The effectiveness of psychedelics might be linked to metaplasticity, the ability to induce plasticity, rather than direct 'psychoplasticity' seen in drugs of abuse.
Research into octopus behavior suggests theory of mind, previously thought to be social, might have evolved from hunting, broadening our understanding of complex behaviors.
Funding and research direction in science can become overly conservative, potentially stifling curiosity-driven exploration like studying octopus behavior or fundamental mechanisms.
UNDERSTANDING CRITICAL PERIODS
Critical periods are specific windows in development where the brain is exceptionally sensitive to environmental input, allowing for the rapid acquisition of crucial skills like language or social interaction. Coined by Konrad Lorenz based on animal imprinting, these periods are essential for shaping brain circuits. While beneficial for learning, their closure means the adult brain becomes less adaptable, posing a challenge for treating developmental or acquired neurological conditions. The current challenge in neuroscience is understanding how to therapeutically reopen these windows for adult learning and recovery.
PSYCHEDELICS AS KEYS TO NEURAL MALLEABILITY
Dr. Gül Dölen's research proposes that psychedelics act as a 'master key' to reopen these critical periods. Her lab discovered that MDMA could reopen a critical period for social reward learning in mice, and further research revealed that other psychedelics (LSD, psilocybin, ketamine, ibogaine) also achieve this, not just through social aspects but by influencing conserved molecular mechanisms. This suggests a broad impact on brain plasticity, potentially restoring the brain's ability to learn and adapt, similar to its developmental state.
THERAPEUTIC POTENTIAL FOR NEURODEVELOPMENTAL AND ACQUIRED CONDITIONS
This framework for reopening critical periods has profound implications for treating conditions previously thought intractable in adulthood. For autism, the idea is to pair psychedelics with existing therapies to restore biochemical imbalances while the critical period for social learning is reopened, allowing for better integration of social cues. Similarly, for stroke recovery, psychedelics might reopen a critical window for motor function recovery, complementing intensive physical therapy by enhancing the brain's plasticity in adjacent areas.
METAPLASTICITY: THE MECHANISM BEHIND REOPENING
The mechanism underlying this reopening is proposed to be metaplasticity – the brain's ability to change its own plasticity. Unlike the 'psychoplasticity' associated with addictive drugs, which leads to hyper-excitability and maladaptive learning, metaplasticity refers to changes in mechanisms that regulate plasticity itself, such as alterations in receptor subunit composition. Psychedelics appear to trigger this by initiating a 'hard reset' of neural signaling, potentially by influencing the extracellular matrix and receptor internalization, making the brain more receptive to learning.
BROADENING THE SCOPE: FROM OCTOPUSES TO ALLERGIES
Dr. Dölen's curiosity-driven research extends beyond typical psychedelics studies, even examining octopus behavior for insights into 'theory of mind.' This pursuit highlights how complex behaviors might evolve and suggests that psychedelics might influence conserved mechanisms across species. Furthermore, the critical period framework opens speculative avenues, such as potentially treating allergies if they involve learned maladaptive immune responses that could be 'unlearned' by reopening a relevant critical period, although this remains highly speculative and distinct from direct anti-inflammatory effects.
THE IMPORTANCE OF CONTEXT AND CURIOSITY-DRIVEN SCIENCE
The therapeutic application of psychedelics is heavily influenced by context, suggesting that the ideal therapeutic intervention will depend on the specific condition, combining the drug with appropriate environmental and behavioral support. Dr. Dölen emphasizes that while traditional knowledge of psychedelic use is valuable, scientific understanding of mechanisms is crucial for adaptation into modern medical paradigms. She also advocates for preserving curiosity-driven research, akin to her investigation into octopuses, as essential for long-term scientific breakthroughs, unhindered by the pressure for immediate, goal-oriented results.
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Dr. Gül Dölen is an associate professor of neuroscience at Johns Hopkins University School of Medicine. Her lab specializes in psychedelics research, focusing on how these compounds can reopen critical periods for learning and memory, potentially offering new therapeutic avenues for various disorders.
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Mentioned in this video
Associate professor of neuroscience at Johns Hopkins University School of Medicine and a pioneer in psychedelics research, known for discovering a novel mechanism for therapeutic applications of psychedelics.
An ethologist who described the concept of critical periods in 1935 by studying imprinting behavior in snow geese.
A neurologist at Johns Hopkins collaborating with Dr. Dölen on stroke recovery research and developing rodent models for motor recovery critical periods.
A biologist who received NSF funding to study bacteria in Yellowstone thermal vents, leading to the discovery of the enzyme necessary for PCR tests.
An eminent octopus researcher whose experiments on octopus hunting behavior were observed by Dr. Dölen, leading to insights on theory of mind in octopuses.
An author whose works, including 'Bullshit Jobs' and 'The Dawn of Everything,' are highly recommended for their perspective on societal structures and history.
His research group showed that LSD has an unusually long off-rate from the serotonin 2A receptor, leading to its prolonged effects.
A philosopher who, over a hundred years ago, pointed out the 'noetic property' of psychedelics: the feeling that profound truth has been revealed.
Author of 'Invisible Women,' a book highlighting gender data bias and its societal costs.
Mentioned metaphorically by Tim Ferriss to illustrate the danger of a scientist becoming too convinced by their own experiences with psychedelics and losing objectivity.
Author of 'The Immortality Key,' a book that deeply resonated with Dr. Dölen.
A renowned biochemist and self-experimenter in psychedelics, known for compounds like PiHKAL and TiHKAL. Dr. Dölen acknowledges his contributions but challenges his human-centric approach to psychedelic research.
A colleague at Johns Hopkins working with Steve Zeiler on stroke rehabilitation, emphasizing non-goal-directed play in physical therapy, which aligns with psychedelic-assisted therapy.
Started Dr. Dölen's department at Johns Hopkins and discovered many neurotransmitter receptors, providing a broad historical definition of psychedelics.
A branch of philosophy that considers the mind from metaphysical and epistemological points of view, asking questions like 'what is the mind?' and 'how do we know mind?'.
A part of the limbic system where oxytocin metaplasticity is restored by MDMA, crucial for the social critical period, distinct from classical cortical critical periods.
A neurobiological process of anticipating what someone else might be thinking, akin to playing poker, and seeing the world from their point of view. It develops in children and is impaired in some conditions like autism, yet enhanced in psychopaths.
A condition for which there seems to be a correlation between the age of the father and the likelihood of offspring developing it, contrasting autism's lack of age-dependent correlation.
A receptor class where ibogaine, among other psychedelics, has high affinity, despite not typically being associated with pleasurable effects.
The first identified and most common genetic cause of autism, caused by a mutation in the fmr1 gene, characterized by an exaggerated mGluR signaling.
A brain region commonly studied in fMRI images related to psychedelics, but whose involvement in generalizable rules of behavior is challenged by Dr. Dölen's octopus work.
An approach coined by Dr. Dölen, standing for Psychedelic Healing Adjunct Therapy Harnessing Opened Malleability, emphasizing the use of psychedelics as adjunct therapy for various disorders.
A condition mentioned to emphasize that autism does not have a similar age-dependent correlation with maternal age.
A receptor identified by Solomon Snyder, often considered mediated for psychedelic effects by chemists, though Dr. Dölen questions its singular importance for therapeutic outcomes.
A fast neurotransmitter receptor, blocked by magnesium, serving as a natural coincidence detector crucial for memory encoding, and whose subunit composition changes during critical periods.
A biochemical pathway triggered when a G-protein-coupled receptor is activated for too long, signaling the cell to internalize receptors due to potential toxic damage.
The gene encoding Fragile X, a mutation in which is the most common cause of autism. The protein it encodes regulates 20-25% of other autism genes.
A hormone involved in the pro-social component of MDMA, with MDMA restoring oxytocin metaplasticity in the nucleus accumbens.
A type of glutamate receptor whose signaling is thought to be altered in Fragile X syndrome. A negative allosteric modulator of this receptor was tested in human trials for autism.
A large family of receptors that most psychedelic drugs (except ketamine and PCP) act upon, initiating biochemical signaling pathways.
A plant known for its active compound salvinorin A, a kappa opioid agonist, causing dysphoric subjective experiences.
A psychedelic drug found to reopen critical periods for social reward learning and other types of plasticity.
A psychedelic drug that reopens critical periods, also discussed in relation to NMDA receptors and memory impairment.
A psychedelic drug capable of reopening critical periods for social reward learning.
The active compound in Salvia Divinorum, a kappa opioid agonist.
A psychedelic drug shown to reopen critical periods, despite not being primarily pro-social.
A book by Brian Moresku, highly loved by Dr. Dölen, influencing her Halloween decorations and sparking interest in archaeochemistry.
A book by Caroline Criado Perez, recommended for its data-driven approach to feminism, showing the societal cost of ignoring data about women.
A large book by David Graeber, recommended for its insights into human history, including psychedelic uses in other cultures.
A book written by Alexander Shulgin and his wife, detailing numerous psychedelic compounds.
A book by David Graeber that Dr. Dölen found cathartic while dealing with academic bureaucracy.
A book written by Alexander Shulgin and his wife, detailing numerous psychedelic compounds.
The institution where Dr. Dölen earned her MD PhD.
A U.S. government agency that funds scientific research and education, mentioned for historically funding curiosity-based science leading to technological breakthroughs.
The institution where Dr. Dölen is an associate professor of neuroscience and conducts her research.
The regulatory body that MAPS worked with to establish guidelines for clinical trials around psychedelics, shifting towards combined drug and psychotherapy models.
The institution associated with The Microdose newsletter.
A primary funding source for academic research, noted for becoming more conservative and challenging for junior scientists to secure grants.
The institution where Dr. Dölen earned her MD PhD and carried out seminal work on critical periods and autism.
Credited for their hard work in convincing the FDA to design clinical trials that pair psychedelics with psychotherapy, recognizing that the drugs alone are not sufficient.
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