Facial expression is the combination of motions or positions of the muscles in the skin that conveys the emotional state of the individual to observers. Facial expressions are a form of nonverbal communication.
- Through the principle of associated habit, the same movements of the face and eyes are practised, and can, indeed, hardly be avoided, whenever we know or believe that others are blaming, or too strongly praising, our moral conduct.
- Charles Darwin, in The Expression of the Emotions in Man and Animals (1872), Chapter XIII: "Self-attention — Shame — Shyness — Modesty: Blushing", p. 347
- The young and the old of widely different races, both with man and animals, express the same state of mind by the same movements.
- Charles Darwin, in The Expression of the Emotions in Man and Animals (1872), Chapter XIV: "Concluding Remarks and Summary", p. 352
- "We know this to be a primary autonomic response, the so called 'shame' or 'blushing' reaction to a morally shocking stimulus. It can't be controlled voluntarily, as can skin conductivity, respiration, and cardiac rate." He showed her the other instrument, a pencil-beam light. "This records fluctuations of tension within the eye muscles. Simultaneous with the blush phenomenon there generally can be found a small but detectable movement of...
- "And these can't be found in androids," Rachael said.
- "They're not engendered by the stimuli-questions; no. Although biologically they exist. Potentially."
- Yeah, body language completely lost…
- Michael J. Fox 
- Adrian Veidt: I've known John long enough to see he isn't devoid of emotion. His subtle facial twitches wouldn't have been noticed by the layman but to me, he might as well have been sobbing.
- Watchmen (film) script by David Hayter and Alex Tse
- That is the great thing about our movement--that these members are uniform not only in ideas, but even, the facial expression is almost the same!
- There yet appeared some touch of their delicate lineaments, preserving the sweetness of proportion, and expressing itself beyond expression.
- Ben Jonson, The Masque of Hymen (1606).
- A motion picture must be true to life. If a picture portrays a false emotion it trains people seeing it to react abnormally.
- William Moulton Marston The Secret History of Wonder Woman (2014) by Jill Lepore, p. 136.
- A nervous tic, an unconscious look of anxiety, a habit of muttering to yourself—anything that carried with it the suggestion of abnormality, of having something to hide. In any case, to wear an improper expression on your face (to look incredulous when a victory was announced, for example) was itself a punishable offence. There was even a word for it in Newspeak: FACECRIME, it was called.