It’s not how they were born, it’s how they have used their brain since then. There is a reason the brain is commonly referred to as a muscle. Whatever parts you use are the parts that get more connections and tissue density as well as overall size due to pushing against the less dense areas beside them. So the oversized amygdala is because it is being used more often, not how they were born.

They are very good at being scared because it’s the part of the brain they work out the most. So it comes so easy to them, almost all pathways lead there eventually. If you only ever work out your arms, you’re gonna naturally gravitate to activities that exclusively use your arms, as they will be so much relatively easier to you compared to other physical activities.

It’s also why doing a wide variety of puzzles and other cognitive challenges as often as possible promotes overall brain health. Don’t skip primary motor cortex day.