Grown-ups also have a sense of object permanence.We know that if we put a box in a room and lock the door, the box will still be there when we come back.But does a baby realize that a ball that rolls under a chair does not disappear and go to never-never land?

　　Experiments done by Bower suggest that babies develop a sense of object permanence when they are about 18 weeks old.In his experiments, Bower used a toy train that went behind a screen.When 16-week-old and 22-week-old babies watched the toy train disappear behind the left side of the screen, they looked to the right, expecting it to reappear.If the experiment took the train off the table and lifted the screen, all the babies seemed surprised not to see the train.This seems to show that all the babies had a sense of object permanence.But the second part of the experiment showed that this was not really the case.The researcher substituted(替换) a ball for the train when it went behind the screen.The 22-week-old babies seemed surprised and looked back to the left side for the train.But the 16-week-old babies did not seem to notice the switch(更换)．Thus，the 16-week-old babies seemed to have a sense of “something permanence，” while the 22-week-old babies had a sense of object permanence related to a particular object.

　　【解题导语】　本文是一篇科普短文，大意是通过实验研究儿童是否知道物体是固体的，是否具有物体持久性的感觉，研究表明，16周到24周的婴儿都知道物体是有形的固体，然而第一项研究表明只有18周以上的婴儿才对某个特定的物体的认识具有持久性。

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