MINNEAPOLIS—A study published Monday in The Journal Of Child Psychology And Psychiatry has concluded that an estimated 98 percent of children under the age of 10 are remorseless sociopaths with little regard for anything other than their own egocentric interests and pleasures.

According to the Hare Psychopathy Checklist, a clinical diagnostic tool, sociopaths often display superficial charm, pathological lying, manipulative behaviors, and a grandiose sense of self-importance. After observing 700 children engaged in everyday activities, Mateo and his colleagues found that 684 exhibited these behaviors at a severe or profound level.

The children studied also displayed many secondary hallmarks of antisocial personality disorder, most notably poor impulse control, an inability to plan ahead, and a proclivity for violence—often in the form of extended tantrums—when their needs were not immediately met.

"Children will use any tool at their disposal to secure gratification," Mateo said. "And as soon as the desire is fulfilled, be it some material want or simply an insatiable and narcissistic desire for validation, they quickly become bored and lose interest in their victims, all the while thinking only of satisfying whatever their next hedonistic craving might be."

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