So what precisely do you define to be the controller of the decision making?
There is no 'controller' of a neural decision making system, that is flawed conceptualisation. If there were to be a 'controller' then it would need its own decision making system with its own internal 'controller' with which the control the decision making.
Doesn't work like that. Decisions emerge out of principles of competition and democracy between rival components of a system. 20 years ago we imagined that the queen ant controlled the ant colony, causing various ants to assume roles so that the colony as a whole functioned well. Now we understand that top down hierarchical principal is flawed, the queen does not exert control, but rather colony level decisions arise out of the interactions of the individuals within the colony. It is known as emergence, and the principles learned from this, such as
recruitment, now inform how we model decision making in a brain, with rival neural assemblies engaging in recruitment until one faction gains significant advantage over its rivals, such as what happens when you decide to stay home with a mug of cocoa rather than go out and climb that mountain. Whichever neural assembly recruits the most wins the day.