马里兰州麦克丹尼尔学院心理学副教授麦德森说，这是一个家长不知道如何去做的领域。
"It is an area where parents aren't quite sure what to do," says Stephanie Madsen, an associate professor of psychology at McDaniel College, Westminster, Md.
2009年麦克·阿瑟基金会天才奖得主、来自普林斯顿大学的丹尼尔·西格曼如是说。
That's according to Daniel Sigman of Princeton, winner of a 2009 MacArthur "genius grant".
他曾经与前诺贝尔奖获得者肯尼斯·阿罗长久共事，也是是另一位诺贝尔奖获得者丹尼尔·麦克法登的研究生导师。
He worked long ago with one previous winner, Kenneth Arrow, and was the graduate adviser to another, Daniel McFadden.
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