>>13622204Scientifically speaking drugs are best administered at an ideal dosage for the person in question. Different people react differently in different ways, though most are documented it still comes down to a one by one basis.
Depending on an individual's reaction to caffeine tolerance their psyche's reaction may completely nullify the positive effects of the drug. Stimulants in general aren't inherently motivational or nootropic, but it is routinely observed in some people.
Im sorry I have no studies for your exact question in particular however the science on caffeine and stims is quite established and im sure with a quick google you will find a suitable answer if one doesn't appear in this thread.
