Anecdata, sample size 1: When I was a teenager struggling in school because of attention issues, a psychiatrist had me take a test which suggested so. IQ and a few memory/recall-related tasks measured a bit higher when I was medicated with Adderall than without it.
Do you remember the % difference?
That should be controlled against simply repeating the test and simply giving "normal" people adderal during iq testing.
Absolutely. 90% of HN readers do it everyday.
I'd assume so given that a large part of how IQ tests derive your score is based on how long it takes you.