>The problem is not a physical problem (a problem of the tongue, mouth or jaw), but rather a psychological problem Yes I agree that the respiratory and largyngual muscles work properly, but it still results in halting the movement of these muscles, causing contractions in the diaphragm - for example because we focus on fear of a difficult letter. In the same way PWS halt the movement of the tongue, lips and jaw muscles (during a speech block) - for example '**fear**' or 'anticipation' leads to freezing or paralyzing the tongue, lips and jaw muscles. **Question**: Do you agree?