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The Evolution of Human Interactions The evolution of the human brain has shaped our social interactions. 5 According to Dunbar’s (1998) early research, the human social group size is estimated at 150, meaning that the average social network spans 150 people in most societies. To understand this, we’ll turn to the social brain hypothesis, which proposes that primates have large brains to support more complex social systems. 4 Social Brain Hypothesis Something that sets the primate brain apart from those of other mammals is its complex neocortex . The neocortex is the area of the brain associated with cognitive processes, making up 50-80% of the total primate brain volume. 4 Research shows that there is a relationship between the size of the neocortex and the level of sociality , which is typically measured by group size. Humans have a larger neocortex than other mammals and nonhuman primates and, therefore, have greater social skills.

THE NUMBERS BEHIND THE SOCIAL BRAIN HYPOTHESIS

We have different layers to our social circles. The closest five people make up our loved ones, followed by 15 good friends, 50 friends, and 150 meaningful contacts. However, beyond that, we can also support 500 acquaintances and recognize about 1500 people. 4

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You Are Not Alone: Social Isolation