Anyways, here’s the part of Jamais’ Fast Company article that is most relevant to your post (Oh, and btw, I’m personally not a fan of cognitive enhancement drugs):

“But ‘letting your mind wander’ is very often an important part of the creative process. The ‘aha!’ experience comes from the brain making connections between superficially unrelated subjects, and identifying a deeper link. How do enhancements that focus our attention affect this process? Is it possible that cognitive drugs enhance one aspect of knowledge work–productivity–while diminishing another–creativity?”