Key Moments

Rethinking Psychedelics, Octopuses on MDMA, and The Master Key of Metaplasticity | Dr. Gül Dölen

Tim FerrissTim Ferriss
Howto & Style3 min read122 min video
Apr 19, 2023|18,669 views|451|56
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TL;DR

Psychedelics may act as a 'master key' to reopen critical periods for learning and plasticity.

Key Insights

1

Critical periods are windows of heightened sensitivity in the brain for learning specific skills, which normally close over time.

2

Psychedelics like MDMA, LSD, psilocybin, and ketamine show potential in reopening these critical periods across various brain functions.

3

This 'reopening' mechanism could offer new therapeutic avenues for conditions like autism, stroke, and potentially allergies, by pairing psychedelics with existing treatments.

4

The effectiveness of psychedelics might be linked to metaplasticity, the ability to induce plasticity, rather than direct 'psychoplasticity' seen in drugs of abuse.

5

Research into octopus behavior suggests theory of mind, previously thought to be social, might have evolved from hunting, broadening our understanding of complex behaviors.

6

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.

Common Questions

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.

Topics

Mentioned in this video

People
Gul Dolen

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.

Conrad Lorenz

An ethologist who described the concept of critical periods in 1935 by studying imprinting behavior in snow geese.

Steve Zeiler

A neurologist at Johns Hopkins collaborating with Dr. Dölen on stroke recovery research and developing rodent models for motor recovery critical periods.

Thomas Brock

A biologist who received NSF funding to study bacteria in Yellowstone thermal vents, leading to the discovery of the enzyme necessary for PCR tests.

Roy Caldwell

An eminent octopus researcher whose experiments on octopus hunting behavior were observed by Dr. Dölen, leading to insights on theory of mind in octopuses.

David Graeber

An author whose works, including 'Bullshit Jobs' and 'The Dawn of Everything,' are highly recommended for their perspective on societal structures and history.

Brian Roth

His research group showed that LSD has an unusually long off-rate from the serotonin 2A receptor, leading to its prolonged effects.

William James

A philosopher who, over a hundred years ago, pointed out the 'noetic property' of psychedelics: the feeling that profound truth has been revealed.

Caroline Criado Perez

Author of 'Invisible Women,' a book highlighting gender data bias and its societal costs.

David Koresh

Mentioned metaphorically by Tim Ferriss to illustrate the danger of a scientist becoming too convinced by their own experiences with psychedelics and losing objectivity.

Brian Moresku

Author of 'The Immortality Key,' a book that deeply resonated with Dr. Dölen.

Alexander Shulgin

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.

John Krakauer

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.

Solomon Snyder

Started Dr. Dölen's department at Johns Hopkins and discovered many neurotransmitter receptors, providing a broad historical definition of psychedelics.

Concepts
Philosophy of Mind

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?'.

Nucleus Accumbens

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.

Theory of Mind

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.

schizophrenia

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.

kappa-opioid receptor

A receptor class where ibogaine, among other psychedelics, has high affinity, despite not typically being associated with pleasurable effects.

Fragile X syndrome

The first identified and most common genetic cause of autism, caused by a mutation in the fmr1 gene, characterized by an exaggerated mGluR signaling.

Medial Prefrontal Cortex

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.

FATHOM Project

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.

Down syndrome

A condition mentioned to emphasize that autism does not have a similar age-dependent correlation with maternal age.

serotonin 2A receptor

A receptor identified by Solomon Snyder, often considered mediated for psychedelic effects by chemists, though Dr. Dölen questions its singular importance for therapeutic outcomes.

NMDA receptor

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.

Beta-arrestin

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.

fmr1 gene

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.

Oxytocin

A hormone involved in the pro-social component of MDMA, with MDMA restoring oxytocin metaplasticity in the nucleus accumbens.

Metabotropic Glutamate Receptor

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.

G-protein-coupled receptors

A large family of receptors that most psychedelic drugs (except ketamine and PCP) act upon, initiating biochemical signaling pathways.

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