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胡卓恺
"What you do is you show a baby something over and over again. Now, remember from behaviorism the baby will learn this isn’t very interesting. Then you show the baby something different. If the baby really sees it as different, the baby will look longer. And you could use that as a measure of what babies find different. For instance, suppose you want to know if the baby can tell green from red. You could show the baby a green patch, a green patch, a green patch, a green patch; the baby’ll get bored, then a red patch. If they all look the same to the baby, the baby will just continue to tune out. But if the red looks different the baby will perk up. And this is, in fact, one way they study color vision in babies."