I specifically notice one thing, speech characteristics. When I'm socially tense, which can be in a one-on-one social situation, such as being uncomfortable with the new doctor (just experienced this on my birthday couple days ago) or especially within the group dynamic, that I "motormouth".
I talk fast, higher than normal volume & pitch, in a monologue; people have to yell at me sometimes to get me to shut up. I started noticing a couple months back during a big overseas reunion party, one lady friend commented on this and the problems it causes, and it happened again in a group situation 3 weeks later in London.
This was before I found out I was Asperger's.
I notice I don't do this as much or as intensely all the time, just when ill at ease. The folks in the reunion I've known for roughly 30 years, makes no diff to this happening when I try to join in the conversation, I still get nervous and motormouth.
When it's someone I know well and we're not part of a crowd, I don't seem to do this so quickly.