We previously demonstrated that behavioral adjustments to environmental properties constituted an objective indicator of presence in Virtual Reality (VR). The subject's task was to walk through virtual apertures of variable width. Subjects exhibited a behavioral transition, from frontal walking to body rotation, while walking from broad to narrow apertures. Here, we tested the same basic protocol, using a Head-Mounted Display (HMD). Overall, results show the same basic behavior (shoulder rotation through a narrow door). However, optimal adaptive behavior (avoiding collision with the door's borders) required both the presence of a dynamic representation of the subject's body (in the visual display) and of a vibrotactile feedback, signaling approach of the subject's shoulder towards the doorpost.
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