General Introduction 13 1 Figure 1.1. Example of a full-body VR system using a smartvest (RE-liON). The two systems used for the VR studies in this thesis share common features which align with this thesis’ definition of VR: • The VR system consists of a head-mounted display which infers three-dimensional properties of a simulated environment through a projection of a two-dimensional perspective of a virtual scene onto each eye (Scarfe & Glennerster, 2019); • The VR system enables free, full-body movements in the simulated environment through sensors on the feet and hands (e.g., REFENSE system) or smartvests with sensors on the entire body (e.g., RE-liON system, see Figure 1.1); • The VR system enables police officers to move in a physical space (in this thesis, a space of up to 30 x 30 meters onto which the virtual training environment is plotted); • The VR system provides replica service weapons that can be functionally utilized in the virtual environment;
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