The Ecstasy of an Open Brain

Key takeaways

Critical periods are specific windows where the brain is especially apt at learning new information.
Psychedelics like MDMA can potentially reopen these critical periods, allowing for re-learning from social environments.
Context is crucial; deploying psychedelics in a social context enhances their effectiveness in therapy.
Neuroscience research continues to uncover the mechanisms behind learning and social dynamics, providing insights for future treatments.
Understanding critical periods may pave the way for better therapies for conditions such as PTSD and recovery from strokes.

Summary

The Concept of Critical Periods

The episode introduces the idea of critical periods, which are specific windows in time when the brain is highly susceptible to learning and absorbing information. Neuroscientist Gould Dolan discusses the historical context of the concept, relating it to famous studies on imprinting in geese. The discussion suggests that these periods are not limited to infancy—they can vary for different skills such as language, vision, and motor learning, where the optimal times for learning are crucial.

Peer Pressure and Social Learning

The conversation shifts to the implications of critical periods in social behavior, particularly during adolescence. Through a personal anecdote, Molly Webster references her teenage struggles, leading to a discussion on how peer pressure may impact learning during these formative years. The research conducted by Dolan’s team shows that adolescent mice are more influenced by their social groups due to heightened sensitivity in their brains during critical periods, indicating a biological basis for learned social behaviors.

Psychedelics: Reopening Critical Periods

The podcast explores the groundbreaking research on psychedelics, specifically MDMA, in reopening closed critical periods. Dolan explains how certain psychedelics can trigger the release of oxytocin, a chemical that fosters social bonding and learning. This can potentially allow the brain to relearn from its social environment and make connections that were previously inaccessible due to the closure of critical periods.

Context Matters in Treatment

The episode highlights the importance of context when administering psychedelics for therapeutic purposes. Dolan points out that giving MDMA in a social context can effectively open social critical periods, while isolation renders it ineffective. This ties into the broader dialogue about using psychedelics in therapy for conditions like PTSD and explains why controlled settings yield better results.

Future Implications and Research Directions

Dolan expresses optimism for future applications of this research, suggesting that the insights gained from reopening critical periods may have profound implications for treating various neurological conditions, such as stroke. The exploration into how these critical periods can be induced with psychedelics may lead to new therapeutic strategies for long-forgotten skills ensuring those with motor disabilities after strokes could potentially gain back crucial functionalities.

Show notes

As we grow up, there are little windows of time when we can learn very, very fast, and very, very deeply. Scientists call these moments, critical periods. Real, neurological, biological states when our brain can soak up information like a sponge. Then, these windows of learning close. Locking us in to certain behaviors and skills for the rest of our lives. But … what if we could reopen them? Today, we consider a series of discoveries that are reshaping our understanding of when and how we can learn. And what that could mean for things like PTSD, brain disease, or strokes. And cuddle puddles. It’s a mind-bending discussion. Literally and figuratively.

This is the second episode in an ongoing series hosted by Molly Webster, in conversation with scientists and science-y people, doing work at the furthest edges of what we know. More to come!

Previous episodes in the series:
Up in Smoke (https://zpr.io/zrN5fgZwiWiR)

Special thanks to Gül Dölen, at the University of California, Berkeley, along with researcher Romain Nardou. Plus, Charles Philipp and David Herman.

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EPISODE CREDITS:
Hosted by - Molly Webster
Reported by - Molly Webster
Produced by -Sindhu Gnanasambandan
with help from - Timmy Broderick and Molly Webster
Original music and sound design contributed by - Dylan Keefe
with mixing help from - Jeremy Bloom
Fact-checking by - Emily Krieger
and Edited by - Soren Wheeler

EPISODE CITATIONS:

Science Articles -

Gul’s 2019 paper: Oxytocin-dependent reopening of a social reward learning critical period with MDMA (https://zpr.io/wfQjeA6PGCBv) on the feel-good brain chemical oxytocin, and how it reopens social reward learning when combined with MDMA.

Gul’s 2023 paper: Psychedelics reopen the social reward learning critical period (https://zpr.io/TKDKEwiLwGRN) on the role of psychedelics in social reward learning.

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