Snapping logic?

I understand the logic that somebody “snaps” and this enables their allomancy powers.

For half nobles, bastards, and skaa it is clear enough how they would snap to reveal their powers considering the stressors on their lifestyle. I’m sure there have to be more like Vin where they do it subconsciously.

Does Brandon ever discuss if the nobles go through the same process or is the bloodline pure enough that it reveals easier?