Fig. 1

Screenshots of the virtual environment with overlays showing the study setup. At the beginning of the virtual scenario, the users meet a small virtual dog in a lifeless, deserted environment (A). By walking on the treadmill, the users can help rebuild its habitat, which continuously gets more fertile and colorful (B). With every star they collect on their way, the progress bar fills up further. Overlays depict the treadmill setup for patients (in the monitor condition, C) and the setup for healthy participants in the HMD condition (D)