huh - i'd not heard of that before, but certainly have ben affected by it. When under pressure I couldn't speak at all to my (abusive) boyfriend. He was grilling me on why i was such a lousy gf. In a desperate attempt to communicate i lunged for a pad of paper and pen, but he wouldn't let me. He yelled, "NO! you TALK to me. NOW" and i couldn't say a word. I was 18. Then later in my first therapy setting (terrified!!) I could not speak to the male t either. we spent an entire hour with me trying to even hang my jaw open so words could spill out - but none did. Then he said "Well that was a waste of my time and yours". Since then i have had plenty of times in therapy (various female ts) where I couldn't talk for some of the session... at least until t changes the topic to daily life or work.
I want to check out that link, too.