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Well, you could show the baby a green patch,
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a green patch, a green patch, a green patch;
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the baby'll get bored,
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then a red patch.
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If they all look the same to the baby,
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the baby will just continue to tune out,
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but if the red looks different
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the baby will perk up.
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And this is, in fact,
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one way they study color vision in babies.
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Surprise is related to this.
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You could show babies something that shouldn't happen.