Fun fact: There is a word in Japanese -- aizuchi -- for "meaningless nothings which you say during a conversation to let the other party know that you're actively engaged in the conversation."

Sitting with a stone face during a meeting in Japan would be very not normative. Your counterparty would assume that either you're totally checked out, repulsed by what is on offer, or so ridiculously above their social standing that you didn't even have to go through the motions of pretending to care about what they had to say.

Your periodic dispatch from Asia Is A Big Place; Consider The Possibility It Is Populated Mostly By Humans.