The influence of body movement on subjective presence in virtual environments

We describe an experiment to assess the influence of body movements on pres ence in a virtual environment. In the experiment 20 participants were to wa lk through a virtual field of trees and count the trees with diseased leave s. A 2 x 2 between-subjects design was used to assess the influence of two factors on presence: tree height variation and task complexity. The field w ith greater variation in tree height required participants to bend down and look up more than in the lower variation tree height field. In the higher complexity task participants were told to remember the distribution of dise ased trees in the field as well as to count them. The results showed a sign ificant positive association between reported presence and the amount of bo dy movement - in particular, head yaw - and the extent to which participant s bent down and stood up. There was also a strong interaction effect betwee n task complexity and gender: Women in the more-complex task reported a muc h lower sense of presence than in the simpler task. For applications in whi ch presence is an important requirement, the research in this paper suggest s that presence will be increased when interaction techniques are employed that permit the user to engage in whole-body movement.