poker face - is super cultural thing, I work with several Asians, most of them (not all!) sits _with_ poker face whole day. It is kind of hard to read people and understand if they got it when I'm explaining something. They are not even nod or smile. I'm European and sometimes it is super frustrating to not receive any body lang feedback. But when we close office doors they starts to chat, nod, laugh and what not.

On other hand there are two Japanese who acts like Europeans all the time - nods, talks, etc even though they left Japan ~2-3y ago. I thought initially that they already adapted to this Western style.

I've talked with them all about this and they just said that they just do what they did in their countries.