A big mistake I see made often on this sub is that a neurological explanation is used as something that happens before talking and that that would cause the stuttering. I believe it is the other way around; blood flow follows brain activation. So the apprehensive anxiety with someone else approaching us or us trying to speak, is what causes hypoactivation in certain areas and that IS the stuttering. It's the same as saying aggression is caused by increased activation of this lobe; it's not 'caused' by it, but it is the activation pattern we see caused by all the emotions leading up to it. The only way i cured my own stutter was by realising this and finding out that it was really just a masked form of social anxiety. It's why most of us can sing and talk to ourselves without much problems. Our brain is very, very excellent in hiding social pain from others, and much more ourselves sometimes. And in my experience it also does not bagatelise the impact of genetics for example, as for example if you have a mutation in a certain serotonin pump so that a certain nucleus stays hyperactivated longer, that could mean that people are impacted more after negative social cues. This does not mean the cause is neurological, but that our genetics and brain make up give us a more sensitive proclivity to stuttering. Once I have some time I will try to make a good write up to integrate my thoughts and the research into something more clear.