Instincts evolved into behavioral elements called "memes".
These memes are sequences of behavior integrating different
portions of our brains in order to recall that specific
behavior to a specific stimuli. Some of these behavior are weighted
heavily by specific "unlearned" training: instinct. Other require us to adapt
to unforseen or events short in duration. This requires higher
brain function. Communicating behavior perhaps without actually doing the
behavior was a huge advantage, and these behaviors had to
follow all the laws of information theory because of course
they themselves were information. Thus the door is open to study memes mathematically.