Yale study: magic mushrooms may grow connections between brain cells

Researchers have observed increased growth in dendritic spines in mice.
Sign up for the Freethink Weekly newsletter!
A collection of our favorite stories straight to your inbox

Researchers at Yale have discovered that psilocybin — the magic in magic mushrooms — can increase connections between nerve cells in the brains of mice. 

The compound does so by goosing the growth of dendritic spines, which stick out from the dendrites, or spiky parts, of nerve cells. Dendritic spines aid neurons in passing information back and forth and are thought to play a role in learning and memory, and the team found that psilocybin increases both their density and their size. 

“We not only saw a 10% increase in the number of neuronal connections, but also they were on average about 10% larger, so the connections were stronger as well,” Alex Kwan, an associate professor of psychiatry and neuroscience at Yale, said in a release

Making connections: According to the researchers, chronic stress and depression can reduce the number of dendritic spines and weaken neuronal connections.

“There are hints that the use of psychedelics can produce neural adaptations,” the researchers wrote in their Neuron paper, “although the extent and timescale of the impact in a mammalian brain are unknown.”

Psilocybin — the magic in magic mushrooms — can increase connections between nerve cells in the brains of mice. 

Those hints come from drugs like ketamine, which has been successfully used to treat depression, possibly through restoring lost neural connections.

“Animal data very clearly suggests that synapses that were lost are restored rather than the creation of random new synaptic connections,” Yale ketamine expert John Krystal — who was not involved in this study — previously told me.

1-up mushroom: To explore the effects of psilocybin on mammals’ brains, senior author Kwan and Yale School of Medicine postdoc Ling-Xiao Shao turned to laser-scanning microscopes. 

The microscopes allowed them to observe and track the dendritic spines in living mice over multiple days. When given psilocybin, Kwan and Shao noticed increased spine growth — and the increased size of each spine — within 24 hours. 

Mice that were stressed out also showed behavioral improvements and increased neurotransmitter activity.

“It was a real surprise to see such enduring changes from just one dose of psilocybin,” Kwan said. “These new connections may be the structural changes the brain uses to store new experiences.”

“It was a real surprise to see such enduring changes from just one dose of psilocybin.”

Alex Kwan

Psilocybin has long been used in Indigenous rites and ceremonies to invoke mystical experiences, and it is increasingly being studied as a potential treatment for depression. While the necessity of these trips to psychedelics’ therapeutic effects are currently up for debate, Kwan believes that the psychological impact of the trip could potentially be what prompts the growth of the dendritic spines.  

We’d love to hear from you! If you have a comment about this article or if you have a tip for a future Freethink story, please email us at [email protected].

Related
Pager panic: When beepers were infiltrating schools
Cities and schools once actually arrested students for carrying this dangerous technology.
Psychedelic drugs and the law: What’s next?
The push to legalize magic mushrooms, MDMA, LSD, and other hallucinogens is likely to heighten tensions between state and federal law.
Does caffeine harm your decision-making?
A small study showed caffeine lessens decision-making. While preliminary, it raises questions about caffeine affects our “higher” cognitive functions.
Professor Giles Yeo on making sense of anti-obesity drugs
Anti-obesity drugs have been in the news, and for good reason; they seem to work. Giles Yeo talks us through some misconceptions at play.
A new hydrogel offers the hope of ending daily injections for diabetes
Type-2 diabetes often involves an intense and exhausting treatment burden, with many injections over many days. That might be set to change.
Up Next
Subscribe to Freethink for more great stories