Physiological reaction and presence in stressful virtual environments
Michael Meehan, Mary C. Whitton, Sharif Razzaque, P. Zimmons, Brent Insko, Greg Combe, Benjamin Chak Lum Lok, Thorsten Scheuermann, Samir Naik, Jason Jerald, Mark R. Harris, Angus Antley, Frederick P. Brooks · 2002
A common metric of VE quality is presence --- the degree to which the user feels like they are in the virtual scene as opposed to the real world. Presence is important for many VE applications [Hodges et al. 1994]. Since presence is a subjective condition, it is most commonly measured by self-reporting, either during the VE experience or immediately afterwards by questionnaires. There is vigorous debate in the literature as to how to best measure presence [Meehan 2001].