When you lead the meditation, I think kneeling is fine, but for me it's really painful, not everybody can do that.

当进行冥想时，我觉得跪地可以接受，但确实感到疼痛，不是人人都可以坚持。

普林斯顿公开课 - 人性课程节选

You don't need your brain for newborn sucking, limb flexation in withdrawal from pain.

新生儿吸吮乳汁无需大脑的参与,疼痛时的四肢回缩无需大脑参与

耶鲁公开课 - 心理学导论课程节选