Is it possible to "integrate" yourself?

On this question (Can people have secret agendas hidden from themselves?”) Coloma said, “Yep, integration and self awareness is the goal for happy and healthy living and relating.”

LostInParadise replied, “The premise of the question is that there is a single self. The evidence from neuroscience is that the brain is divided into a multitude of individual regions and the sense of self is kind of grand illusion. I have heard a theory that says that any time we feel conflicted about someting, it is in essence one part of the brain working against another.”

Is it possible to get the brain to work in concert, or is it necessary for healthy living that it maintain separate parts so as to give us alternative points of view so we can have a better chance of making a good decision? Could working against yourself—if your brain is equally divided between two alternatives—actually be helpful?