Keeping in mind the neurological dictum "cells that fire together, wire together," one sees a similar occurrence in the social field.
At the very end of a 10 day meditation course, the noble silence is lifted, in which all of the participants may proceed to talk again.
Much can be seen in this environment, as everyone is socially fresh after having their executive controls lifted for so long. Everyone you approach is open with smiles and questions, and the usual modern social defenses and cautions are lifted.
When you get people in a group, something very interesting happens. When you're talking to a given person, you feel your volition radiating towards the person, and you see that volition mirrored back towards you. Project joy and gratitude for the person's existence, and you see that joy and gratitude coming back through in turn and washing over you, affecting your volition in turn.
This state, upon repetition, develops a memory, which is quicker to happen the next time.
Now take the people that you don't talk to as much, and you can literally see the connection cooling. Their attention drifts from you; they seek others. The connection is weak and it takes more energy to re-establish. Defenses come up over time, and they are less certain about your intentions.
Networks form around these connections, taking their shape from the energy differentials in the connections.
Take this principle to an extreme, and it is easy to see what types of behaviors will develop in a stressed and unstable social environment. Paranoia arises, as well as xenophobia, as each connection is uncertain, and only the closest, most trusted connections hold.
We form these networks on a mathematical, exponential basis, in accordance with the nature of the medium, and the way that energy moves through the medium, much like forming snowflakes.