Why the weird mouth postures? Well, semi occluded vocal tract modifications actually occlude the vocal tract partially and keep the cords slightly separated due to the build up of positive intraoral pressure. Parallel vocal cords lessen the physical effort and improve vocal economy.
Four different types of masks were tested: 1) no mask 2) disposable surgical mask (with the 3 layers) 3) a FFP2 respirator and 4) a clear plastic mask with a cloth frame. Each was tested to see how they compared to the other to see how they impair (or if they impair) sounds of spoken speech. They looked at multiple different output measures, including the AVQI.
Any voice user knows that when there’s vocal trouble from crazy schedules, different venues, demanding vocal tasks and even airplane travel, we will try anything to get things better. We’ve tried special tea, lozenges, and even gargling with salt water or ginger. Are any of these treatments actually beneficial?
It’s not often enough that those of us who are voice users or those of us who rehabilitate voice, get to see what our mechanism looks like. Rarer still, is the chance for an SLP to observe in the operating room for a procedure that many clients undergo.