You take a nine-month-old and for Piaget a nine-month-old is just starting to make sense of objects and their permanence.

你找到一个九个月大的婴儿,在皮亚杰看来,九个月大的婴儿才刚刚发展出,客体以及客体永存性的概念

耶鲁公开课 - 心理学导论课程节选

And I have up here--This is a picture of Elizabeth Spelke, who is a developmental psychologist who's developed the most research on looking at babies' looking times and what you could learn from them.

这里是一张伊丽莎白·斯皮克的照片,她是一个发展心理学家,在婴儿注视次数,及其意义方面研究颇多

耶鲁公开课 - 心理学导论课程节选