History of work and civilization related blog post here.
(http://www.herecomeseverybody.org/2008/04/looking-for-the-mouse.html)
While the speculation takes several different twists and turns, the basic premise is that drugs allowed society to deal with a cognitive surplus while work changed and morphed to fit the industrial revolution. While insightful, one is left to wonder if video games qualify in the current environment or whether the addictions to participation are a substitute for the easing of the cognitive surplus effects.