In a short time the Mankind had conquered the Globe making changes to the newly populated ecosystems. When we consider the evolutionary success of our species there must have been a complex adaptations and characteristics which in favourable environmental conditions had led to leave Africa by our ancestors and allowed them to adapt to various habitats. This process had been conditioned by the specific social ties which derivative is widely understood inter-cooperation that is constantly expanding the circle by unrelated individuals. The mechanism deployed for this purpose has been the combination of appropriate structures of the endocrine system and the developing brain creating emotional brain. It affects the choices made by us which are verified by natural selection and fixed in our genotypes. The man is programmed to specific forms of cooperation. Cooperation gene succeeded and were represented in a bigger number in successive generations. Their selfish desire to reproducer led to adjustment to circuits hormonal and emotions conditioned by them. Those genes affects the emotional systems of other people to obtain benefits for themselves from a common coordinated work. Emotions become exponents of the will of the genes and restrict our range of choices. Cooperation is mainly conditioned by oxytocin and vasopressin, related to the dopamine reward centre and their secretion is inhibited by stress hormones. Learning the operation of this system will bring us closer to understanding the issue of our cooperation.
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