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They let participants solve the knapsack problem under the influence of common ADHD meds like ritalin, dexamphetamine, modafinil.

Interesting results were observed. Participants who performed below average while on placebo tended to improve on the task when on one of the drugs. Those that performed above average tended to have decreased performance on the task.

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> Participants who performed below average while on placebo tended to improve on the task when on one of the drugs. Those that performed above average tended to have decreased performance on the task.

It's relatively known/accepted that these drugs have a different effect on people with ADHD and people without.

Did they just diagnose a bunch of people with ADHD through treatment?

> Did they just diagnose a bunch of people with ADHD through treatment?

Seems so. Isn't this an open secret that by far the most cost-effective, accurate and immediate way of diagnosing ADHD is to put someone on low dose of stimulants and seeing what happens? The effect is usually apparent in hours.

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