> So imposter syndrome may not be so much about an unrealistically low feeling of competence, but about not having internalized the performance social signifies of confidence.

Well... I don't know if imposter syndrome is so black and white. All I have is anecdata; I grew up upper middle class, went to some great schools, and held some really wonderful jobs (especially my current job, which is my dream!) - but each day I wonder if today is the day they realize just how little value I bring to the team. The frameworks I've built always need some kind of improvement and when my coworkers look at code, they just debug it in their minds almost instantly. Me? I need to manually step through the debugger with most of the bugs I work on. Management will discuss new features with our team and I'm still trying to figure out fixing the technical debt from the last feature. I've held this job for quite a while so I guess I'm doing something right but holy cow there's no way I'm in the same tier as my coworkers.

I dunno, I'm not saying that I disagree, all I'm really saying is I think there could be more that goes into imposter syndrome than class upbringing. It's a dissonance of knowledge and belief: I know I bring value, but I sure don't believe that I do.