Interactions between two individuals who do not know each other —regardless of whether the interactions are aggressive, peaceful or constructive— follow a number of steps. The first consists quite simply of spotting the other individual and turning towards him or her. Contact is then sought, resulting in an ongoing social interaction. These steps, which depend on the reward system that originates in the ventral tegmental area (VTA) of the brain, involve dopaminergic neurons, widely recogn...| NCCR-Synapsy