A four-day old infant is given a pacifier to suck on. Moments after being given the pacifier, an experimenter plays a recording of conversation in English. Initially, the infant reacts to this stimulus by sucking more rapidly on the pacifier, with interest, though, after a few minutes, the infant becomes disinterested by the stimulus. As soon as the infants shows disinterest, the experiment switches the recording to a conversation in French. Immediately, the infant begins to suck rapidly on its pacifier as it becomes interested in the new stimulus. This demonstrates:
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