cool!

We all learned this in DARE class. About the rats in a cage who can self-administer morphine who get addicted to the stuff, and then just hit that lever until they die. A seemingly keystone argument in the war against drugs. Professor Avram Goldstein, the creator of that study, has said: "A rat addicted to heroin is not rebelling against society, is not a victim of socioeconomic circumstances, is not a product of a dysfunctional family, and is not a criminal. The rat's behavior is simply controlled by the action of heroin (actually morphine, to which heroin is converted in the body) on its brain." So, it's the drug, and its addictive control. Surely we must eradicate drugs as a result! 

But there's another model out there by researcher Bruce Alexander of Simon Fraser University called Rat Park. From that wikipedia page: 

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 it is attributable to their living conditions, and not to any addictive property of the drug itself. He told the Canadian Senate in 2001 that prior experiments in which laboratory rats were kept isolated in cramped metal cages, tethered to a self-injection apparatus, show only that "severely distressed animals, like severely distressed people, will relieve their distress pharmacologically if they can."

To test his hypothesis, Alexander built Rat Park, an 8.8 m2 (95 sq ft) housing colony, 200 times the square footage of a standard laboratory cage. There were 16–20 rats of both sexes in residence, an abundance of food, balls and wheels for play, and enough space for mating and raising litters. The results of the experiment appeared to support his hypothesis. Rats who had been forced to consume morphine hydrochloride for 57 consecutive days were brought to Rat Park and given a choice between plain tap water and water laced with morphine. For the most part, they chose the plain water. "Nothing that we tried," Alexander wrote, "... produced anything that looked like addiction in rats that were housed in a reasonably normal environment." Control groups of rats isolated in small cages consumed much more morphine in this and several subsequent experiments.

And so rats that are born into extreme conditions in small cages are clearly more likely to self-medicate. Tom Stafford of the BBC writes: 

Context matters.

A good environment encourages healthy living.

A bad environment begets self-medication.

Great stuff.  Get this out to public policy influencers, stat!

Well, not sure we should over-react to this one experiment the way we did the first one. :-)  Still, this is a very provocative result.   Would be great to see some serious debate about this. Maybe this would be a great brick to hurl at the glass houses of our current drug policy...

If we feel like we are free(ish) to choose our destiny (aka a bigger cage) addictive substances don't seem necessary. It's when we feel trapped (even if the cage door is open) that we may turn to the heroin switch.