Emotion Types | Mouth Expression | Eye Expression | Eyebrow Expression |
Happiness | The lips are raised and pulled back; The mouth may be enlarged; May expose teeth; | The lower eyelid is pushed upward by the facial muscles; There may be wrinkles under the lower eyelids; | The eyebrows are slightly bent down; |
Fear | Opened mouth; Pulling the lip back; The lip angle may be elongated; | The upper eyelid is lifted and the lower eyelid is tightened; | The eyebrows are raised and wrinkled together; Wrinkles appear in the middle of the forehead; |
Surprise | The lower jaw falls; the mouth is open; Lips and teeth apart; The mouth is not stretched and not nervous; | Eyes are wide; Upper eyelid elevation; Lower eyelid drop; | The eyebrows are lifted and bent; Stretching the skin under the eyebrows; Wrinkles may span the forehead; |
Sadness | Pull down the corner of the mouth; The corner of the mouth may tremble; | The upper eyelid of the intraocular corner is raised; | Skin muscle folded between the two eyebrows; Stacked together; Part of the eyebrows are raised; |
Disgust | The upper lip is slightly raised; Combine the lips and push up on the upper lip; The corner of the mouth is pulled down and the lips are slightly convex; | There are non-longitudinal folds under the skin of both eyes; Pushing the lower eye muscles under the eyes; | Lowered eyebrows and lowered upper eyelids; |
Anger | When the mouth is closed, the lips are straightened to the left and right; when the mouth is opened, the lip angle is pulled down; | The lower eyelids are tightened, raised or not lifted; the upper eyelids are tightened; the eyes are wide and may bulge; | The eyebrows are wrinkled together and depressed; Vertical wrinkles appear between the eyebrows; |