A smile or a laugh emerges spontaneously over the person’s face, rising upward toward the nose and taking the form of a snarl. The smile/laugh will be more vertical than horizontal, often contained within the nose area and pressing up against the inner cheeks.
This signal reveals genuine laughter/smiling and a moment of emotional vulnerability. Unlike zygomatical smiles, snarling smiles have little or no deliberation involved, causing these smiles to appear when there is an overtake of private feeling as one is resonating with the emotional register. This reveals a psychology whose emotions are transparent, and whose true feelings seep out of them without much coordination.