There are five basic categories of human movement. Facial expressions belong in this category:

Question

Quizplus · Accepted Answer

Facial expressions are part of the category of affect displays, which are nonverbal gestures that reveal an emotional state. Emblems are specific gestures that have a direct verbal translation (like a thumbs up), regulators are nonverbal cues that control the flow of conversation, adaptors are self-touching behaviors, and illustrators are gestures that accompany speech to help emphasize or clarify words.

There Are Five Basic Categories of Human Movement