Dr Josh Turknett: The Genius and the Impostor | Degrees of Health
In my early twenties, I read everything I could get my hands on, because I’d picked up the idea that my brain would basically stop changing at 25. That turns out to be completely false. It also worked, because it made me take learning seriously. Which is sort of the whole point of this conversation.
Dr Josh Turknett is a neurologist, and his new book The Genius and the Impostor takes apart what he calls the special brain story: the idea that you’re born with a maths brain or a music brain and a fixed amount of “smart juice”, and your job is to work out which one you got. He thinks it’s wrong and doing real damage. Beliefs shape outcomes, from the placebo and nocebo effects to the Pygmalion effect in classrooms, and Josh argues the special brain story is the nocebo effect at scale.
The book centres on two characters. The genius is the unconscious learning engine that taught you to walk, talk and socialise from nothing, and it never goes away. The impostor turns up in adolescence. It’s the narrative voice in your head, a module in the language cortex found in split-brain research, whose job is to explain your behaviour with total confidence and no real insight. It really cares about status, which is why it’s so keen to tell you you’re not a maths person.
We get into why plasticity is about need rather than age (there’s an owl study involving inverted goggles), why curiosity is the signal to follow, why you should give your impostor a name, and why Josh calls the online world “purified impostor”. We also cover the minimum effective dose for learning, somewhere between five and twenty minutes, which he worked out teaching himself banjo while working ninety-hour weeks as a neurology resident. Plus why brain training apps only make you good at brain training apps, why rest is where the growth happens, and the idea that plasticity itself is plastic: the more you learn, the better you get at learning.
Josh’s closing line stuck with me. We built our whole theory of intelligence before we understood the brain, which is like building a theory of digestion without knowing about the stomach. And we’re still using it.
LINKS
🧠 The Genius and the Impostor: geniusandtheimpostor.com
🎧 Better Brain Fitness podcast, with Dr Tommy Wood 🎙️ Josh’s performance neurology podcast 📬 Substack
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