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<p>well cranial blood flow is strongly determinant of strokes. just the simple measurement of blood pressure is tightly linked to stroke risk - for every x decrease in that, you get a substantially reduced risk for having stroke of any type (the vast majority of strokes are small enough to go unnoticed). now, thinking modulates the flow of blood in the brain, right? and algebraic structures are pretty immense daunting objects to be thinking about. so it worries me that doing so, if you’re not properly trained to think about such things, could induce a lowgrade stroke without you being aware of it. i wasn’t really using an analogy to them, i meant a real one, which is why i’m going stay away from too much abstraction. remember what happened when humans tried to teach chimpanzees to count, or to vocalize and then when that failed sign language? it was muddled in controversy, scientific fraud, confusion, and gave a lot of those involved (the least of which being the poor chimps!) a big headache. this is the same reason why teaching humans abstraction should undertaken with some care and discretion i think.</p>