To Remember Anything, Quiz Yourself Instead of Re-Reading It

Neuroscientist Andrew Huberman keeps his own memory sharp not by re-reading, but by quizzing himself. He asks a chatbot to write him a test on something he learned recently, or on neuroscience he learned years ago, and then tells it to make the test harder.

Huberman calls self-testing "the most overlooked powerful protocol for neuroplasticity," meaning the brain's ability to rewire itself to hold memories. That claim is backed by brain imaging and by tests of how well people learn.

In studies, people read a passage once, twice, or four times, took notes, or highlighted. By far the most powerful way to form a stable memory, he says, was trying to recall the information cold.

The method is simple and deliberately uncomfortable. Close the book and pull the answer from memory, whether it is something from two days ago or 30 years ago. He suggests a mental walk back to a childhood friend's house, or listing what you learned yesterday.

Resist checking right away. Push until you hit the point where you cannot remember, that tip of the tongue friction where a name or fact will not come, and linger at that stuck point briefly before you look it up.

That struggle is the signal. As Huberman puts it, if your nervous system can already do what you are asking, "there is absolutely no reason for it to change." The errors have to come from deliberate effort, from trying your best and failing, not from careless or intentional misses.

When you try hard and fail, he says, an error signal travels through the cerebellum, the small brain structure at the back of the head, telling the rest of the brain it needs to reshape itself. That reshaping happens later, during deep rest, especially sleep.

Both deep, non-dreaming sleep and dreaming sleep matter. Huberman notes that some people need six hours a night, and some need nine, so people should aim for what they need consistently. Missing sleep for a night or two will not completely wipe out learning, he says, but it should not become a habit.

To start tonight, take a walk and test yourself from memory. Have a chatbot build a short quiz, answer without peeking, and ask it to raise the difficulty when it feels too easy.