![]() ![]() ![]() We then review several different methods of measuring presence: questionnaires, physiological and behavioural measures, breaks in presence, and a psychophysics method based on transitions between different system configurations. Copresence, togetherness with others in the virtual world, can be a consequence in the context of interaction between remotely located participants in the same shared virtual environments, or between participants and virtual humans. Presence (PI and Psi) together with the illusion of ownership over the virtual body that self-represents the participant, are the three key illusions of virtual reality. Both are with the proviso that the participant in the virtual reality knows for sure that these are illusions. We argued in a 2009 paper that presence consists of two orthogonal illusions that we refer to as Place Illusion (PI, the illusion of being in the place depicted by the VR) and Plausibility (Psi, the illusion that the virtual situations and events are really happening). We review the concept of presence in virtual reality, normally thought of as the sense of “being there” in the virtual world. 2Institute of Neurosciences of the University of Barcelona, Barcelona, Spain.1Event Lab, Faculty of Psychology, Universitat de Barcelona, Barcelona, Spain.Mel Slater 1,2* Domna Banakou 1,2 Alejandro Beacco 1 Jaime Gallego 1 Francisco Macia-Varela 1 Ramon Oliva 1 ![]()
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