"A series of studies by Marian Radke-Yarrow and Carolyn Zahn-Waxler at the National Institute of Mental Health showed that a large part of this difference in empathic concern had to do with how parents disciplined their children. Children, they found, were more empathic when the discipline included calling strong attention to the distress their misbehavior caused someone else: "Look how sad you've made her feel" instead of "That was naughty."