As you pointed out the problem with the article is that it makes no distinction between therapeutic low-dose usage and abuse level usage.
From "Prescription stimulants in individuals with and without attention deficit hyperactivity disorder: misuse, cognitive impact, and adverse effects", published in Brain and Behaviour (2012):
"In sum, the evidence concerning stimulant effects on working memory is mixed, with some findings of enhancement and some null results, although no findings of overall performance impairment (Smith and Farah 2011). However, the small effects were mainly evident in subjects who had low cognitive performance to start with, showing that the drug is more effective at correcting deficits than “enhancing performance.”"
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Secondly, that study is flawed because it fails to acknowledge what is known as the 30%-30%-30% jump. The difference in intelligence between a retard and a normal person is the same difference of intelligence between a normal person and a genius. Different boosts account for different corrections in deficits depending on the IQ range that is being operated on. This is a known quirk of intellect. Being why Einstein sent a letter to his son telling him that intelligence was not the reason he was successful, "working hard" was, and urging him to do the same.
Amphetamines are performance enhancing drugs. They give the same "cracked out" superman effect to anyone who takes them. They are amazing. And we should not discount them by giving credence to the bullshit that is ADD and the epidemic which is giving dumb kids speed so they can live up to their parents' standards.
ADD is overdiagnosed, and adderall/speed is overprescribed in doses that hit high enough that their grandma can feel it. It's fucked up to be giving hard drugs to kids just because the kids are dumb. Let them be dumb. Let's not make them drug addicts at the cost of their mental freedom.
Just google for it, the stories on forums and other places. There are millions of kids who grew up and regret the drug issues they have now. The dependencies. Because they've been on speed their whole lives, because of a giddy parent and a giddy psychiatrist long long ago. The stories show that treating "ADD" with speed in children, is a really shitty thing to do.
Known by who? Did you just respond to a peer-reviewed study with made-up pseudo-science? Also, I should point out that the psychiatric term is ADHD, not ADD.
I didn't say the study is bunk. I said that looking at performance differences as significant without reference to the 30/30/30 effect is extremely misinformed. What I should have said is that the study's "interpretation" is flawed. That would have sounded more rigorous.
While that's partly true, in this case it's a systematic review of the literature on this exact topic. That's not nanny-picking some random study.
Over time you will develop more of a tolerance to these stimulating effects, at least to a degree, but the therapeutic benefits will continue for as long as you take them.
I don't take it in the morning for that reason. Because it has zero stimulation / awakeness effect on me, I wait to use it in the afternoon, when sleep inertia has fully dissipated.
EDIT: calm down wrt physical movement, symptoms on the cognitive side are still very present of course. It's just that adults tend to be better equipped to cope with some of them.