Influence of Meditation: the Medial Prefrontal Cortex

The medial prefrontal cortex(mPFC), also called the Me-Center, is a part of the brain that is responsible for processing information regarding the awareness of the self. For example, when a friend says how bad a shirt looks on you, this part of the brain is responsible for balancing your self-referential reaction against the assessment center, the empathetic and logical portion of the mPFC.
The extreme of the self-referential reaction is that of fight-or-flight, a constant loop of anger, angst, and fear. The other end is the assessment response, a logical form that takes the self out of the picture. In this study, researchers looked at the balancing of this "internal" and "external" system through meditation (link).
The result: Meditation balances these two forces within the mPFC.  As this develops, our the mind will become more receptive to acting how you want versus letting outside events dictate how you react both internally and externally.