What's particularly interesting is you get this effect easily with undergraduates but you also get it with four-year-olds and with monkeys.

但这个实验有一个很有趣的地方,在本科生中做这个实验，很容易就得出这个结果,而在四岁小孩和猴子中，同样能得到这个结果。

耶鲁公开课 - 心理学导论课程节选