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if I then appeared in back.
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But no, I'm just here.
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That's object permanence.
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If I went under here and then the people said,
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"Where the hell did he go? Class is over,"
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that would show a lack of object permanence.
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So, adults have object permanence.
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Piaget's very interesting claim is that kids don't.
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Before six-month-olds, Piaget observed,
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you take an object the kid likes like a rattle,
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you hide it, you put it behind something,
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it's like it's gone.