I commented to a client about a tendency to devoice when emphasizing a word, and I thought I pass the clarification on to everybody on the blog. The tendency is for the voice to fade and the throat to tighten when going up in pitch to stress a word – high and tight:
Notice I gave in to the tendency a lot of people have when they do this – jutting the head forward on every emphasized word. Looks especially goofy with my pencil neck!