I. “The psychological sense of being in a virtual environment”[1]

II. “extent to which a person’s cognitive and perceptual systems are tricked into believing they are somewhere other than their physical location”[2]

III.The subjective experience of being in one place or environment, even when one is physically situated in another”[3]

References :

1.Slater, M., Usoh, M., & Steed, A. (1994). Depth of presence in virtual environments. Presence: Teleoperators & Virtual Environments3(2), 130-144.

2.Patrick, E., Cosgrove, D., Slavkovic, A., Rode, J. A., Verratti, T., & Chiselko, G. (2000, April). Using a large projection screen as an alternative to head-mounted displays for virtual environments. In Proceedings of the SIGCHI conference on Human Factors in Computing Systems (pp. 478-485).

3.Witmer, B., M.J.Singer: Measuring Presence in Virtual Environments: A Presence Questionnaire. Presence: Teleoperators and Virtual Environments 7 (1998) 225 – 240