I think I made very clear since the beggening that the theories are not 100% based on evidence. There are articles about dopamine and stuttering, but quantitiy and doest not mean quality of evidence. We cannot confirm the role of dopamine in stuttering, only that "there's a relation relation between dopamine levels and stuttering," but not yet conclude how this mecanism works, when it causes stuttering, when its working as a causal factor or a consequence of stuttering, and other indirect impacts on stuttering,. Dopamine is actually related with other disorders like depression, Schizophrenia, and even autism, with the same difficulty on explanation: "It is related to the disorders," but the mecanisms are unclear. Even in treatment, dopamine medicines not always have the same result as we predict, sometimes does not even get results. I am sure that with stuttering is the same, or otherwise, medicine would be highly recommended and high efficient. And besides, a lot of other treatmens not related with dopamine can help stuttering, including what I quoted, "easy onset" techniques, that is nothing related to dopamine treatments. It shows that the disorders (including stuttering) are complex, and we cannot address a single cause. The most safe is to addres a genetic/hereditary predisposition, but I wouldn't be surprised with not even this an obligation to develop sttutering (like congenital but no hereditary conditions). As me, you can share your theories or thoughts about how dopamine works on stuttering, including if emotions has a role in dopamine levels in stuttering (cause dopamine is also linked to emotions).