1996), it is much like both cinema and television in their early days, which were used essentially as a medium for theatre. As has been mentioned before ( Pausch et al. In other words, virtual reality has rarely been seen as a medium in its own right, as something that can create new forms of experience, but rather as a means of simulating existing experience ( Brooks Jr 1999). Yet it is a medium that has the potential to go far beyond anything that has been experienced before in terms of transcending the bounds of physical reality, through transforming your sense of place and through non-invasive alterations of the sense of our own body. The vast majority of research and development in this area has been to use it as a way to simulate physical reality.
The technology for immersive virtual reality (IVR) has existed for 40 years, initially as a demonstrated laboratory-based idea (the ultimate display) ( Sutherland 1965) and for the past 20 years as practical, affordable and useful systems. We argue that when both PI and Psi occur, participants will respond realistically to the virtual reality. Psi is determined by the extent to which the system can produce events that directly relate to the participant, the overall credibility of the scenario being depicted in comparison with expectations. PI is constrained by the sensorimotor contingencies afforded by the virtual reality system. In the case of both PI and Psi the participant knows for sure that they are not ‘there’ and that the events are not occurring. Second, plausibility illusion (Psi) refers to the illusion that the scenario being depicted is actually occurring. The first is ‘being there’, often called ‘presence’, the qualia of having a sensation of being in a real place. The idea is put forward, based on the experience of a large number of experimental studies, that there are two orthogonal components that contribute to this realistic response. In this paper, I address the question as to why participants tend to respond realistically to situations and events portrayed within an immersive virtual reality system.
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