Not a paper, but a (likely) academic anecdote involving a pediatrician/quack on Johnny Carson back in the day. We've been watching old shows from the '70s, when Johnny had 90 minutes, and usually that included a non-star/celebrity, often senior citizens or others with weird talents or claims to fame. In this category was goofy doctors/experts, and on the Jan. 12, 1979, show they aired last month, a celebrity doctor at that time, a Dr. Lendon Smith, started opining about his (and likely accepted elsewhere) theories on tickling and children, and he touched on stuff talked about on this thread --- how people oftendismiss tickling as a childhood or "childish" phenomenon you grow out of. This quack (later lost his license for insurance fraud and illegally dispensing medical advice and drugs) said, and anything in quotes is a quote, how part of his practice involves working with "children who give teachers trouble at school” --- likely ADHD in today’s terms, I may so boldly diagnose. He then says “hypersensitive children are more likely to have trouble at school," and he means physically sensitive, kids he termed "“ticklish, sensitive, goosey kinds of kids." He then said he invented a device that he advises teachers to use to identify such kids. It's a stick with feathers on it, and he said the teachers should have the kids lie on a floor -- "ideally naked" --- and lower the stick and tickle them with feathers. He claims the kids who break first will give them the most "trouble" in class. I think this is worth sharing here because it shows that this "childish" shit we've had to put up with for our lifetimes with our fetish often is reinforced by actual medical "experts." Yeah, he was later discredited, but at that time, he was semi-famous, doing 90-second medical tips on TV and radio at that time, so he had the credibility of being a (creepy) doctor at a time when fewer people were skeptical of "experts" as they are now, with crooks like Dr. Phil and Dr. Oz out there. No telling how much damage people like him did, further pushing us in the shadows as "perverts."
Other notable nontickling stuff from the show involving this guy -- sharing the couch with Doc Quack was Richard Pryor and Tim Conway, and Johnny couldn't get a word in edgewise, so Pryor starts cracking up during this guy's ramble, then Tim starts making smart-ass remarks, so maybe that and the audience laughing at the comedians helped deflate this guy's credibility.