Body postures and movements are frequently indicators of self-confidence, energy, fatigue, or status. Cognitively, gestures operate to clarify, contradict, or replace verbal messages. Gestures also serve an important function with regard to regulating the flow of conversation. For example, if a student is talking about something in front of the class, single nods of the head from the teacher will likely cause that student to continue and perhaps more elaborate. Postures as well as gestures are used to indicate attitudes, status, affective moods, approval, deception, warmth, arid other variables related to conversation interaction.The saying "A picture is worth a thousand words" well describes the meaning of facial expressions. Facial appearance - including wrinkles, muscle tone, skin coloration, and eye color-offers enduring cues that reve1il information about age, sex, race, ethnic origin, and status
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