Well, ok this doesn’t explain why his reaction time without caffeine also improved (and even more so than with caffeine) but perhaps this could be explained by something like: caffeine increases the efficiency of some circuits, reaction time tests/exercises sculpt those circuits and sculpt them even more when on caffeine and some of that sculpting persists even when not on caffeine. (speculating ofc)
Well, ok this doesn’t explain why his reaction time without caffeine also improved (and even more so than with caffeine) but perhaps this could be explained by something like: caffeine increases the efficiency of some circuits, reaction time tests/exercises sculpt those circuits and sculpt them even more when on caffeine and some of that sculpting persists even when not on caffeine. (speculating ofc)