How are they able to perform well under intense pressure? Literally life or death situations. I'm talking about hardcore parkour or crazy people climbing skyscrappers.
Have their brains been altered that they can't feel fear from their stunts?
Alex Honnold is the best free solo climber in the world, man can climb el cap or half dome in a few hours without a rope, where it takes a normal climber days to get up. But the man literally has an underdeveloped brain, or at least part of it. After doing brain scans found out his amygdala has ZERO activation, so he literally experiences fear differently than a normal person, if at all!
Yup, they measured that. This one individual wasn't experiencing any sort of fight-or-flight in that tube. I'm going to say we can't draw much in the way of big conclusions. Reminder again that activation just means how hard it's working at a given moment.
Honestly, the testimonials from ex-girlfriends is more interesting to me.