Oh Japanese..Veeeeeeeeeeeeeeery quiet and worse, in all Asia, very hierarchical...very deferant... (read about co-pilots in Asian Airlines never speaking out when pilot is doing things wrong, and go to their death silently rather than screaming at the pilot..
It IS a problem.. Hell I was just in China again and talking about the top-to-bottom tendencies in all Asia and silence and obedience were so important..