ππ Why might someone pass exams on LSD without notes?
Claim
After a classic psychedelic dose, the brain may enter a brief neuroplasticity window where recent material encodes more strongly while updating when rules change gets harder. One way to read that mix is a short-lived overfitting bias; that offers a speculative explanation for stories of effortless memorization, not proof they happened.Thoughts
When I was at uni, one of my housemates once told me a story that sat in my brain for years. He had a friend who would turn up to one class on LSD every time. No notebook, no laptop, yet he supposedly passed every exam.
Now that psychedelic research has become mainstream, this story suddenly got more of my attention. Classic psychedelics like LSD can open a brief neuroplasticity window where the brain rewires synapses more readily for hours to days after a dose.
What the studies actually show
One low-dose LSD study, testing people the next day, found improved episodic memory and verbal fluency, but reduced cognitive flexibility on tasks where the rules change without warning.
Reviews report fast changes in plasticity genes, dendrite shape, and synaptic strength after one dose that last beyond the trip, which fits a short plasticity window rather than a permanent rewrite. Human markers are noisier, but they point the same way.
Stronger recall, worse rule-switching
That next-day mix looks like overfitting in ML terms: recent examples get overweighted, so recall improves and rule-switching suffers. Call it a temporary bias toward whatever is directly in front of you, with a tradeoff against flexible updating. No paper I cite uses that word for LSD cognition; this is an analogy, not established neuroscience.
What that would mean for the story
Seen through that lens, my housemate’s story stops being pure magic. If you attend the same lecture repeatedly while the brain is extra plastic but biased toward stamping in whatever is in front of you, you might encode those classes with unusual strength. I never verified the anecdote, and this is not a recommendation.