To be compelled is to be driven, the way cattle are driven along a road. It makes a quick test in the moment: am I choosing this, or am I being moved?

What the research says

In a randomised experiment, increasing relative activity in the right frontal part of the brain with mild electrical stimulation made people brood more on their anger. That suggests the state a person is in causally shapes whether they get pulled into going over it. It was a small stimulation study in a laboratory, so it supports the general point without saying anything about a real quarrel.

Strength of evidence: one line of research. A single study, or a theoretical account.