Facial Expressions – Microexpressions
A microexpression is a involuntary facial expression that has a duration of sometimes only a fractional second that truly tell the emotional state of the humans according to their then felt emotion. Culturally universal, they are different from macro-body expressions which vary by culture.
Joy
The mouth smiling can be a false positive. Look at the eyes. Mouth corners up, and the eye cover fold (the gap between eyelid and eyebrow) are pulled down by eye muscle. This is a show of true joy.
Anger
Jaw muscles pushing jaw forward or pressed lips. Even a smile is false if the eye cover fold (the gap between the eyelid and eyebrow) is narrowed. If eyebrow corners are not pointed down or tightened, there is no true or or happiness. Lower eyelids themselves will be tensed.
Sadness
Look to the lips, corner of mouth down or eyebrows drawn up slightly.
Surprise
Eyebrows raised may mean attention or interest but upper eyelids raised can be surprise, worry or fright, look to the input and other features; lips may part, eyes widened.
Fear
Tensed lower eyelids accompany raised upper eyelids and the rest of the face is blank. Eyebrows raised and drawn together; raised upper eyelid (wide eyes) and lips drawn back towards the ears
Disgust
Look to the nostrils, they will be pulled up in a “nose wrinkle.” Forehead may also be furrowed.
Contempt
Eyes narrowed, nose slightly wrinkled. Look for a peer with slightly wrinkled nose.