Great question. [Evan Usler's](https://www.reddit.com/r/Stutter/comments/1e67dco/comment/ldumga5/?utm_source=share&utm_medium=web3x&utm_name=web3xcss&utm_term=1&utm_content=share_button) research provides two accessible scientific diagrams. I wrote [this ](https://docs.google.com/document/d/13txDoF3JrPeAWDRSDIaBHhepaAz949_YqDp3rGQq2CY/edit?usp=sharing)summary based on various research studies, discussing such mechanism more in-depth (that prevents speech motor plans from (overt) execution) in response to perceived threat/conflict (aka perceived speech errors in the speech plan) - that is, perceived as a problem, an error, or at least an obstacle, and to be avoided, '*the need to reduce/increase something in order to reduce the (too high) activation of the mechanism*' so that it results in initiation of motor programs. I'd appreciate any feedback after you've read my summary. I would truly appreciate it!