There’s a research paper stating that stutters don’t stutter in self talk (alone in a room unaware of anyone listening). If anyone displays interest in reading it I’ll find it tomorrow and post the details. Adults who stuter do not stutter during private speech by Jackson et al 2021 - https://www.dropbox.com/s/kyhuxbr135iesal/ARTICLE%20-%20Adults%20who%20stutter%20do%20not%20stutter%20during%20private%20speech%20by%20Jackson%20et%20al%202021.pdf?dl=0