[SpaceCadetJones]

I can actually attest to being less playful on medication. I'm a very upbeat, humorous, and witty person. Too much of a stimulant however makes me very bland, an intense listener, and I have trouble coming up with replies to people. I tend to think of it as generally I have a firehose of ideas and thoughts spewing, and medication pinches the hose and directs its flow. It's a balancing act though

[reitanqild]

I believe you. That said it seems to vary wildly.

From what I have witnessed it even varies with type of the same stimulant from person to person, even within a family. (In a case I know all too well the recipient get tongue swelling as well as clenched jaws[0] on R XR at 40mg/day but has absolutely no issues with doses from 40 - 80 mg/day of the standard one. Oh, and the other person in this study, the brother of the first, went into spiraling weight loss at 60mg/day but prefer XR.)

Also playfulness seems to be preserved in these two cases. The best explanation I can come up with is: lowers the "interesting" threshold so that driving according to the speed limits is less intensely boring etc.

[0]: of course this can be reactions to additives of XR but they are commonly referred to as side effects of R itself.

[antihero]

I found this with Ritalin as a kid, and amphetamines/various analogues as an adult. It makes me so focussed I get colossal social anxiety and my brain loops over everything. It's horrendous, and kinda stunted my social development.