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Jonathan_Graehl comments on Irrationality Game II - Less Wrong Discussion
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Irrationality game comment
The importance of waste heat in the brain is generally under-appreciated. An overheated brain is a major source of mental exhaustion, akrasia, and brain fog. One easy way to increase the amount of practical intelligence we can bring to bear on complicated tasks (with or without an accompanying increase in IQ itself) is to improving cooling in the brain. This would be most effective with some kind of surgical cooling system thingy, but even simple things like being in a cold room could help
Confidence: 30%
Overheating your body enough to limit athletic performance (whether due to associated dehydration or not) is probably enough to impair the brain as well. Dehydration is known to cause headaches.
I think the effect exists. But what's the size, when you're merely sedentary + thinking + suffering a hot+humid day?