[phoronixrly]

You need to add that all of this is self-reported/subjective. I've gone under doctor's supervision through L-Theanine+Caffeine, then Modafinil, and finally Ritalin, and to be brutally honest, while I subjectively feel the best when on Ritalin, I am far from certain I would be able to show it in a blind study with an objective problem-solving task.

Also a blind study with these would be hard, as Modafinil has a noticeable effect on heart rate and blood pressure, and general response to stress (at least in my case), and also causes a distinct chemical smell of one's urine.