Amphetamine (adderall, vyvanse): +1

I've been using this for motivation and to combat akrasia for about 1 yr. Were it not for tolerance/dependance, i would give this drug at least a +6, the effects from a single dose can be quite profound. Basically, I was unable to achieve consistent boosts in motivation without increasing the dose, which would continually increase side effects until I had to abstain for a while, rinse/repeat. My guess is that this drug is much more useful for people who are naturally motivated; the other cognitive benefits (increased focus, mental clarity) do not seem subject to the tolerance issue. As for dependence, I just mean learning behavior X with amphetamine may mean dependence on amphetamine for behavior X