In socionics context when you are interacting with a Role Fe type person, you can see that they fake expression in certain situations because you just know that they feel they should be nice and smiling and friendly with a coworker, or an employee in a socially contrived situation, ie: good morning how are you, how was your weekend? oh good thank-you mine was great as well, good
You can tell they don't really give a shit, but the socially contrived situation has a need for a display of objective ethics.
Key words "should" and "need". These shoulds and needs are cues for super-ego: internalized societal expectations. Fit in the moment requires some overt display of Fe emotional ethics so as to command the proper objective etiquette for said moment.