Social life, evolution of intelligence, behaviour and human brain size

Social life is one of the most critical factors of the evolution of the behavior of non-human primates and humans. Several factors, such as an increase in brain size, adaptive modules, and grooming, are related to the complexities of social groups. Although some scientists have mentioned foraging as a rival hypothesis for the evolution of behavior, in this research, we tried to investigate the role of social life. Factors like an increase in brain size, cheat-detection module, the theory of mind, and group size in the evolution of human behavior and the end, the function of the group, and mechanisms of group integration are discussed.