Overview

It is possible that many of you are scandalized by the second question, since it is true that in evolution things are not built under a teleological thought, that is, they are not built for any purpose, but those forms that best adapt are selected. to the circumstances of the moment. However, to simplify the book, I will speak in teleological terms, so I repeat the question again: what was the brain built for? To answer this question we are going to go to a very basic point of elementary biology. what is a living being? A general acceptance is that a living being is a set of matter organized in a complex way that is more or less related to the environment and whose main characteristic is to have the ability to reproduce, that is, to make similar copies of itself. The rest of the functions are debatable, but the one to reproduce is crucial. Living beings have been acquiring complexity throughout evolution. And here we find a very interesting fact, and it is that, at a certain moment of evolution, there were some beings who decided that if the food did not reach them, they would reach the food. And to achieve this, they developed systems that allowed them to move, move, in contrast with other forms of life -fundamentally plants- that chose to be sessile and remain anchored to a substrate. The ability to move and explore somehow forced them to equip themselves with a series of sensors to be able to recognize the world around them, locate food, detect danger and meet individuals of the same species in order to reproduce. The acquisition of these sensors forced the existence of a control center that knew how to interpret the information that came from them and that had the capacity to make decisions and react in some way based on said information, as well as to coordinate its own and complex movements. And in this way the nervous systems were built. As time went by, nervous systems became more and more complex, but they never forgot their fundamental mission: to survive and reproduce. Remember, a species that does not reproduce becomes extinct. So evolution set up strong biological pressures for nervous systems to be very good at doing both of those things. Those who were not good in those two entrusted missions did not reproduce and did not reach us. Therefore, we are heirs to the nervous systems that did their job well.

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