Alex Honnold's brain shows no fear response during extreme climbing stunts. This neuroscientific insight reveals how repeated exposure rewires the perception of danger.

Climber Alex Honnold is set to scale one of the world's tallest buildings without any ropes or safety nets.

I’ve been studying the amygdala for more than 30 years. When I started this work, research on this brain region was a lonely field of inquiry. The hippocampus was all the rage, and I sometimes felt ...