Which are the stimuli in facial displays of anger and happiness? Configurational bases of emotion recognition.

Two studies examined the hypothesis that geometric patterns in the facial expressions of anger and happiness provide information that permits observers to recognize the meaning of threat and warmth. A 1st study sought to isolate the configural properties by examining whether large-scale body movements encode affect-related meanings in similar ways. Results indicated that diagonal and angular body patterns convey threat, whereas round body patterns convey warmth. In a 2nd study, a set of 3 experiments using models of simple geometric patterns revealed that acute angles with downward pointing vertices conveyed the meaning of threat and that roundedness conveyed the meaning of warmth. Human facial features exhibit these same geometric properties in displays of anger and happiness