来自《耶鲁大学开放课程：心理学导论 第5集 第5集》

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  a nine-month-old is just starting
  九个月大的婴儿才刚刚发展出
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  to make sense of objects and their permanence.
  客体以及客体永存性的概念
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  You take an object and you put it here in a cup
  你将物体放到这里的一个杯子中
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  where the kid can't see it,
  婴儿看不见这个物体
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  but it's in the cup.
  但这个物体是在杯子之中的
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  So the kid, if you were the kid, will reach for it.
  如果你是这个婴儿 你便会伸手去拿
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  You do it again, reach for it.
  你再做一遍 他会伸手去拿
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  You do it again, reach for it.
  你再做一遍 他还是会伸手去拿
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  That's point A.
  这个地点是A
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  Then you take--you move it over here.
  然后你把杯子拿到这边
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  Piaget observed
  皮亚杰观察到
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  kids would still reach for this.
  婴儿仍然会将手伸向此处