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Originally Posted by Suave
When you say control, do you mean completely (as in, have the ability to stops one's heart)? Because I know it can be controlled indirectly (slowed or speeded up slightly, but not full control), but I've never heard of complete control over one's heart.
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It's mostly people who can adjust rate, but there was one guy in the early 1900s who could stop his heart at will. He did it for half an hour once and died the next day. I can drop my blood pressure by almost 20/10 points in a minute or two just by relaxing and focusing on it. I suspect that I'd be able to do heart rate or even pupil dilation if I put enough effort into it. I can also wiggle my ears, although that's not too uncommon.