One chapter reports that children become more aggressive by imitating television violence—they are not aware that television exaggerates and misrepresents real life. Another chapter reports that, when observed, men are less expressive of pain or disgust than when they are alone. In another chapter, we are told that in 1862, Duchenne noted that smiles of enjoyment involved not only the mouth muscle (zygomatic major) but also the muscle that circles the eyes (orbicularis ocularis). The "false smile" is any smile that does not involve contraction of the orbicularis ocularis muscle. The presence of upturned corners of the mouth and of wrinkles around the eyes can be interpreted as signaling happiness. "When a specific universal emotion is elicited, a specific set of facial muscles is activated."