Answer: The renewed interest in the stuffed animal after losing interest in the brightly colored balls may be due to a change in the type of stimulus that Leslie is being presented with. When Leslie was given the stuffed animal, it may have been a new and different type of toy for her to play with, which may have increased her interest and curiosity. This change in stimulus could be considered a form of reinforcement, as it may have strengthened Leslie's behavior of showing interest in new and different stimuli.
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