Relationship

When an idea, or a concept, is told (in any way) to a person in a frequent way, and for a long enough period of time, the person will develop a deeper, stronger, interpretation of the subject, and therefore, will believe in it. The brain-washed fanatics of any type of ideology are a prime example of this matter. It also happens in less significant, and more personal cases. If a person hears, sees or reads that they are ugly every week, after a certain period of time, they will believe that they are ugly, no matter how fine and beautiful they look.
The brain evolves, and creates more connections, more paths, and [thus] more networks, within itself.

The reason we, as humans, are capable of learning, the truth behind our fascinating intelligence (which is not, and has never been, even close to perfection in any individual), is brains ability to create more connections, and possibilities, with the help of the already existing neural networks at the moment of starting the process (which may take as short as fractions of a second, and as long as years and decades). The nature of the factors affecting this progress determines the nature of the function of the created network.
It is fair to assume that the pattern for these processes can be also transferred to the infants by their parents, just like the other physical or neural characteristics which are received by the children through them. The level they have progressed to is different in any individual, just as the factors and causes affecting them are, which may result in a stop in the of progress of the networks in a group of individuals, and hence, oppressing the whole network.

This concept is quite easy to express through the language of Mathematics. A system performing the act of iteration (inputs to the system are its outputs) is a suitable choice for a model. However, the system itself is a web of similar systems, which is fed by the output of a similar group of networks. So, the iteration only happens in one direction.
The connections within each system, and the groups of networks, can be determined and modeled using fractal geometry.

NOTE: This is an extreme and specific (yet more obvious) example of the development of behaviour in every individual. It can be easily generalized to cover every naturally progressed neural network in the brain.