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by leading questions.
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And it can be extremely subtle.
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In one experiment,
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the person was just asked in the course of a series of questions
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shown a scene where there's a car accident
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and asked either, "did you see a broken headlight?"
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or "did you see the broken headlight?"
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The "the" presupposes
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that there was a broken headlight
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and in fact, the people told--asked,
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"did you see the broken headlight?" later on
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are more likely to remember one.