It seems as though the mind is, on a psychological level, governed by basic laws. For instance repulsion and attraction; in essence a human can only be in motion and move towards or away from an object. There are factors which either attract or repel an individual. We on a conscious and subconscious level can either be attracted to a thought or repelled from a thought.
Another is that due to the nature of organisms; humans ultimately do things for themselves.
So I can conclude that because a human can either be attracted or repelled and an organism's primary function is that of itself that the mind structures it self in accordance to those guidelines.
So the human mind is structured based on positive reactions to their environment and negative reactions to their environment that are dictated by the need for organisms to sustain themselves.