Robert Plutchik’s diagram visualizes eight basic emotions: joy, trust, fear, surprise, sadness, disgust, anger, and anticipation. Of those eight, all but trust and anticipation are emotions captured through facial coding. (The other core emotion that facial coding can detect is contempt, a combination of anger and disgust.) The emotions are arranged both in contrasting pairs and by having similar emotions next to one another. Each petal shows differing levels of a given emotion.
The chart below details Sensory Logic’s facial coding system, with four descending levels of happiness (from most to least intense), and positive versus negative surprise among the 12 emotional states. A simplified description is given for how each emotional state appears on faces, and its likely behavioral implications.