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Rat park and heroin addiction (Health )
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Devil 
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Rat Park was a study into drug addiction conducted in the late 1970s (and published in 1981) by Canadian psychologist Bruce K. Alexander and his colleagues at Simon Fraser University in British Columbia, Canada.

Alexander's hypothesis was that drugs do not cause addiction, and that the apparent addiction to opiate drugs commonly observed in laboratory rats exposed to them is attributable to their living conditions, and not to any addictive property of the drug itself.[1]

To test his hypothesis, Alexander built Rat Park, a large housing colony, 200 times the floor area of a standard laboratory cage. There were 16–20 rats of both sexes in residence, food, balls and wheels for play, and enough space for mating.[2] The results of the experiment appeared to support his hypothesis.
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