John Harrison commented that it was hard for him to understand how locking his vocal cords in a three second block could be organic. Same point for prolongation of a sound like "s" in Sssssssssssssssssssssan Francisco...
I have a hard time understanding how it might NOT be! But I fear we are like the blind wise people who are surrounding an elephant and are trying to determine what it is....It's a snake! ...It's a tree!
However John also commented that talking quickly and rising emotions could bring out genetic issues as different people react differently to stress and such "interference" could "end up in stumbling-like disfluencies".
I was about to say that I agreed until I realized you were edging with a "slight of definition". It seems to me that your "stumbling-like disfluencies" are meant to exclude blocks. To me they are a primary and far more important sympton of an organic problem than "stumbling-like disfluencies" (what you used to call "bobulating"?).
In the past we have worked hard at finding commonality in our thinking, and we have, but we are good friends enough that it's entirely OK if we don't agree. I think it would actually be more useful now to really stress where where we do not agree. I know we beat the "origin of block" to death a while back, but it might be worth a rehash.
Important long-term study of children with the 7-year data. - I am busy right now, but maybe some of you can give its relevance. It seems to be one of or the largest study ever done? J Speech Lang Hear Res. 2017 Oct 3...
1 month ago