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- er took the train off the table and iifted 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.

　　1. The passage is mainly about________.

　　A. babies' sense of sight

　　B. effects of experiments on babies

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