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How you appear in the virtual world could affect your behavior in real life, according to researchers at Stanford University. Andrea Seabrook speaks with Stanford's Jeremy Bailenson about his research into how people interact psychologically with their virtual-reality representations.

An avatar is a graphical representation of one's self, personality or alter-ego while engaging in online communication.  Avatars can range from simple, static 2D graphics to complex, animated 3D forms controlled by the user. First of a great series on avatars. Clear, concise.