Willpower is a graded system likely governed by a single brain area that accesses contextual information.

“if indeed there is a single brain area that can govern willpower and willpower is not one but is at least two things the sense of I absolutely will no matter what you say do Etc or I absolutely won't no matter what you say do Etc well then this brain area can't be a simple switch it can't be willpower on Willow off willpower on Willow off it can't be absolute as we say it must be graded it must have levels so it's more like a slider on a light switch than an on versus off light switch”