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by weej 2734 days ago
They do - their amygdala.

"fMRI testing at the Medical University of South Carolina tilted the scales toward precisely that explanation — an underactive amygdala, not a negligent mother — by confirming that Honnold’s fear circuitry really does fire with less vigor than most."

https://www.nytimes.com/2017/06/09/opinion/el-capitan-my-el-...