Andrew Huberman· PhD
But when you're overheated, the direction of flow in those blood vessels reverses. So the cooled blood that's coming from your facial region goes into that circulation and actually is a cooling source for the brain.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
But when you're overheated, the direction of flow in those blood vessels reverses. So the cooled blood that's coming from your facial region goes into that circulation and actually is a cooling source for the brain.
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So you can cool the brain. You can have a cooling effect on the brain by pouring water on on your head.