I hope I didn't kill the comments. I was in a rather bad mood when posting last night and realize I came off kind of strong. For that, I'm sorry. Anyway, to actually answer your question rather than go off on some soapbox tirade about a poorly thought out hypothesis .... Although I don't know exactly what he's referring to by "humdronian speech" given the brief description he provides, my knowledge of the valsalva maneuver and how he describes it's role in stuttering therapy, my guess is it's going to be some form of easy onset. The main problem he describes is that speech is arrested because the vocal folds are sealed tightly together. Thus, vowels are the problem in stuttering. So, the therapy is likely to be some form of "easy onsets" and "continuous voicing." The concept of easy onsets are often quite difficult to explain in person in such a way that the person can accurately reproduce it, and in text next to impossible, but the gist is that the vocal folds begin vibrating while there is already positive airflow through the larynx. So you start breathing out and slowly begin to vibrate the vocal folds without ceasing the positive airflow. In an exaggerated form the easy onset sounds breathy and at a low pitch. So, start on an "h" and slowly begin to add voicing. The voice will be low and the breathiness of the "h" continues for a few hundred milliseconds. To say "apple" it will sound something like "hhhhaaaaapple" (remember, this is the exaggerated form, as one gets accustomed to producing easy onsets he/she can do it almost immediately with relative ease so that is sound very natural). Continuous voicing is a technique where the larynx continues vibrating throughout the utterance taking very little time not vibrating. For this one think of the night time radio DJ, "and now you're listening to WKGV jazz at night" or whatever. Pitch is low, volume is low, it might be a little breathy. [This is a good example between Terry Gross and Jon Stewart](https://www.youtube.com/watch?v=Fdx3yh_-3cU&list=PLHN4FsaERmHj-l0iASH9GTqCPptd19TvE). Terry's voice is is almost always vibrating, while Jon's is going on and off frequently. Maybe you'll hear the difference, maybe my trained ear hears the difference very clearly. I hope it helps. Again, I didn't mean to prevent anyone else from commenting by my first post.