Would two environments both with no refined adictive additive create a similat conclusion about interesting vs boring environments similar to what the authors claim? I have no idea, so I just read a poor summary of a typical rat addiction study.
But would they be jumping up and down when the dude came into the lab if they weren't looking for that next hit?
Or were they starving those poor creatures? I wouldn't doubt it.
I'll hazard a guess that they weren't jumping up and down because they wanted to take another spin in the new moving environmental element.
Or did they remember that when the dude came in, they could take the new thing to get a whole Froot Loop? Perhaps.