Hi, sorry, don't know your name. My name is Ken. Thanks for reading my comments. Wow, three years passed... I didn't realize it! Unfortunately, I suspended my stuttering research. Instead, I switched to writing in which, I believe I better succeeded, so far... Yet, I didn't forget my "idee fixe," and I would return to it shortly. Explaining my "idea" in two words: There are not one feedback participating in speech, but many. Audio feedback is important but is acting when a PWS starts talking. "Block" can be explained by muscle spasm, which is another feedback taking role in speech. Another vital part is speech rate. It's well known fact, that PWS speech with a metronome is fluent. So, I found out that the variability of speech rate during spontaneous speech is "the thing" we are delinquent. We can establish better channel for communication if you wish...