What he did in his study was place rats in a bare cage with two bottles they could drink from, one of which contained water, the other water laced with morphine. Not surprisingly, the rats preferred the bottle laced with morphine, and in time they became addicted to it. What Alexander did next was interesting. He repeated the experiment, only this time he placed the rats inside what he called Rat Park, a cage with a running wheel, foliage, other rats, both male and female, and so on. In other words, he provided the rats with an enriched environment. When placed in Rat Park the rats did not
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