[1] https://thelastpsychiatrist.com/2007/08/how_to_take_ritalin_...
There is such a thing as state-dependent memory or context-dependent memory: recall is better when the environmental context (e.g. location, lighting, smells) matches the context of learning.
If you study while on Adderall, which alters your neurochemical state (increasing dopamine and norepinephrine activity), you may recall that material more effectively when you are in the same neurochemical state, that is, also on Adderall.
Similarly, if someone learns something while sober, they will generally recall it better when sober again, rather than under the influence of a drug.
It is the phenomenon where memory recall is improved when the internal physiological or psychological state matches that during learning.
1. Ritalin, and other stimulants are not cognition enhancing for non-ADHD adults and may in fact do the opposite.
https://www.cam.ac.uk/research/news/smart-drugs-can-decrease...
2. > Because the doctor will rigorously apply artificial and unreliable diagnostic categories backed up by invalid and arbitrary screens and queries to make a diagnosis. So after this completely subjective and near useless evaluation is completed, your doctor should be able to exercise prudent clinical judgment to decide if Ritalin could be of benefit.
What else can you do for psychiatric conditions? We don't have a magic ADHD-o-meter but know that it statistically impacts lifespan, health, etc. Even for more objective measures like blood glucose, BP, BMI, clinical interventions are based on discrete thresholds that don't exist in nature.