Oct
5
In mammals, play is necessary for forming normal social connections. Rats and cats raised in social isolation become incompetent in dealing with others of their kind and typically react with aggression. In our species, abnormal play as children often presages dysfunction in adults. A notable feature of psychopaths is that their childhoods lacked in play. Serial killers are often reported to have had abnormal play habits, keeping to themselves or engaging in particularly cruel forms of play. Sometimes such problems are associated with early-life head injury.
Play, Stress, and the Learning Brain - Dana Foundation