Hey becky,
I think quite a few people with autism experience that it gets harder to speak as you get more overwhelmed. Me, I've never gone completely mute so far, but my answers will become shorter and shorter and eventually, if it's too much, I just usually stare at a fixed point on the floor or table and don't speak unless absolutely necessary. And even if I feel good I don't speak much, I rather listen.
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Your Aspie Score: 151 of 200
Your NT Score: 48 of 200
You are very likely an Aspie