Here is something interesting. I don't know how valid the study is, but it seems plausible enough. Japanese people and Americans differ in how they view faces.
Japanese etiquette is much stricter about not expressing visible emotions, so they tend to express emotions with their eyes. Even their emoticons portray the eyes at the expense of other facial features:
^_^
>.<
;_;
o_O
^_-
(. )(. )
etc.
Americans look more at the mouth when expressing emotions or reading emoticons: :biggrin::lol::?:O:o, which is something most Japanese would find strange.
Interestingly enough, the article goes on to state that the Japanese believe in conformity, humbleness and subdued emotions as something that promotes better relationships. I'd classify that sort of reasoning as Fi-based, and Modern Japan itself is probably Delta. So the OP may very well be correct.