I understand that this article is focused on a different type of drug, but still I would have appreciated some mention of nerve growth factor. I find it interesting that Rita Levi-Montalcini worked until she was 102 years old, and I've read reports of NGF maintaining brain size in old people, so there is some evidence of it being "neuroenhancing" in some sense. It should get a mention in an article like this.
I think the article may be focusing more upon the intention behind taking the drug, rather than the drug's actual function. If we were to extend the definition as functionally "neuroenhancing," you may end up with a rather wonky list; Take for instance 2,4-Dinitrophenol.
Source:http://onlinelibrary.wiley.com/doi/10.1080/15216540600702198...
