“He was bothered by the fact that the cages in which the rats were isolated were small, with no potential for stimulation beyond the heroin. Alexander thought: Of course they all got high. What else were they supposed to do? In response to this perceived shortcoming, Alexander created what we now call “the rat park,” a cage approximately 200 times larger than the typical isolation cage, with Hamster wheels and multi-colored balls to play with, plenty of tasty food to eat, and spaces for mating and raising litters.[ii] And he put not one rat, but 20 rats (of both genders) into the cage. Then, and only then, did he mirror the old experiments, offering one bottle of pure water and one bottle of heroin water. And guess what? The rats ignored the heroin. They were much more interested in typical communal rat activities such as playing, fighting, eating, and mating. Essentially, with a little bit of social stimulation and connection, addiction disappeared. Heck, even rats who’d previously been isolated and sucking on the heroin water left it alone once they were introduced to the rat park.”
