Screenshots of the virtual environment seen through the head-mounted display.

<p>(a) The obstacle as seen during full-vision trials or from inside the viewing window. (b) The thin, red line marking the location of the front edge of the obstacle as seen from outside the viewing window in Experiment 1. When the subject was outside of the viewing window in Experiment 2, there was no line indicating the obstacle’s location. (c) The subjects’ virtual feet were visible when the subject looked down.