Key Concept - The two key facial cues for recognizing a frown are the steep angle and lowered position of the inner eyebrows.
What is the FROWN Threshold?
Figures 1 & 2: The face transforms from neutral to angry when the inner eyebrows lower significantly at a pronounced angle.
FAIGIN FACE BLOG
So many faces. So many ways to express emotions. Faigin examines facial expressions in movie stills, cartoons, fine art, illustrations and photographs and shares his insightful analyses in his monthly blog.