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.
I have to say that everyone experiences a shortening of breath when they get into uncomfortably cold water, that is a universal physiological response. Everyone also experiences a 30 to 80% decrease in cognitive function, in particular, the frontal cortex.
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Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
Actually, when we get into very cold water, there's a very robust decrease in the activation of the prefrontal cortex, which is the area of brain real estate right behind the forehead that controls structured thinking, your ability to reason and make sense of what's going on. If you get into really cold water, you should not expect that brain region to work or at least not work very well at all for the first 20 or 30 seconds that you're in the cold water.