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Virtual reality (VR) systems provide users with a computer-mediated experience of a sensory world that exists for them as a virtual world within which they can act and interact. Popular fiction has portrayed the VR experience as generating such a realistic illusion that users can forget that they are experiencing a virtual world that is generated by computer. In practice, however, such strong illusions do not typically result unless users are presented with a coordinated interactive display of information via multiple sensory modalities. Therefore, VR systems often include auditory displays as well as visual displays so that users can hear as well as see what occurs in the virtual environments that are generated for them through computer simulations. Of course, haptic display technology can also ...

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