Maybe if you sign with Parkinsons...

I suspect they do but don't know for sure. The reasons I would think they do are because they use a lot of other linguistic concepts almost eerily similarly to the point that when you account for the sensory difference there's not many differences left. I've also seen some fascinating clinical examples (some of them actually from discussing the patients' ~~speech~~ sign? qualities with the interpreter since that's part of my assessment).

One of the coolest things I ever saw was a patient who signed ASL as a first language and couldn't write well. So where a hearing person might sound a word out even just silently feeling your lips move, they were fingerspelling off to the side to "feel out" how the words were spelled! It might seem really dumb of me but it really blew my mind to think about at the time.

I forget where I read about this one, but deaf schizophrenics tend to visually hallucinate disembodied signing hands or moving lips, instead of hallucinating auditory voices.

In another case I saw the patient had a lot of weird, wide jerky arm movements that could be really alarming to an unexpecting passerby. We knew the patient was deaf and signed, but we also weren't certain it was ASL (long story). The interpreter then told us that whether or not the patient was typically able to speak ASL, they were not doing so at that time. I don't recall if or how they would have checked for any of the other sign languages). But it turned out when they cleared up that they did in fact speak ASL, which means that was sign-salad! Word-salad is a classic symptom of psychosis and is exactly what it sounds like- seemingly random words and syllables just all mashed in together. AND IT HAPPENS IN SIGN LANGUAGE TOO BECAUSE IT'S ALSO A LANGUAGE AND THAT'S FASCINATING!

Also I suspect it would either manifest as shakiness in the hands or something else entirely that isn't intuitive from a hearing perspective. For instance I found out that to show double letters in fingerspelling you slide, you don't bounce. I wouldn't have thought of it that way but it makes sense now that I know I guess.

Anyway I really should go to sleep I work tonight!

✌️🖕🖕🖕👊 means nnnnno. Joke aside idk... It would be hesitation rather than stutter

Stuttering is a failure connection between brain, lungs and mouth. Has nothing to do with hands so no, sign language people don’t stutter.

Source: I stutter since 4yo and spent a lot of time with other stuttering people helping them.

Reminded me of the podcast Terrible, Thanks for Asking called T-T-T-Today, Junior. I couldn't find it on the official site cause it's not very well designed for search. I'm assuming my link will give the same content I originally heard. It was pretty heartbreaking.

My brother had a stutter. It's a bit psychological and a bit just technique. A lot of people can learn to drop their stutter with physical therapy and speech training, like my brother did. I doubt a stutter could even manifest in sign language with the exception of other issues that cause involuntary hand movement (like tourettes or other disorders that come with tics or muscle spasms), considering it's not a problem in the brain but somewhere between the brain and your mouth/lungs. But nobody would call that a stutter.

If it's psychological, it might happen sort of. We are quite prone to subconscious suggestions, so someone in a susceptible state of mind could perhaps convince themselves to unintentionally create such a type of stutter.