What is IQ in the end, except performance on IQ tests? Or more general problem solving ability. Stimulants definitely improve problem-solving capability:
This would be true even if the mechanism was "merely" an increase in focus. It turns out ADHD meds do more than that though, as they also improve working memory and mental stamina.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3880463/
This would be true even if the mechanism was "merely" an increase in focus. It turns out ADHD meds do more than that though, as they also improve working memory and mental stamina.