Radesky cites the "still face experiment" devised by developmental psychologist Ed Tronick in the 1970s.

拉德斯基引用了发展心理学家埃德·特罗尼克在20世纪70年代设计的“面无表情实验”。

In fact, according to developmental psychologist David Elkind, United States society tends to push children so rapidly that they begin to feel stress and pressure at a young age.

事实上，据发展心理学家大卫·艾尔金德所说，美国社会急于催促逼迫孩子，以至于他们在很小的时候就开始感受到了压力。