I pick up accents, phrases, gestures without thinking. I sync walking, with people I'm walking with or with random strangers, without thinking. I used to mirror behaviors and attitudes before I grew old enough to find out or choose my own. when I started learning about neurodivergence, I figured that this was how masking expressed in me. I figured your description sounded close enough that the term might fit. but if you learn about another that does better, please share, I'd love to know, because masking sounds a little too intentional to me.