Complex motor skills start to diminish at 145 beats per minute, which wouldn’t matter much in a swordfight but could definitely ruin your aim with a rifle. At 170 beats per minute you start to experience tunnel vision, loss of depth perception, and restricted hearing. And at 180 beats per minute you enter a netherworld where rational thought decays, bowel and bladder control are lost, and you start to exhibit the crudest sorts of survival behaviors: freezing, fleeing, and submission.
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