FIGURE 2.

Portable setup and virtual reality feedback. a) A respiratory belt captures the respiratory movements of the chest and sends the signal to a smartphone via Bluetooth. Bespoke software generates the virtual environment. b) A matched-gender virtual body is displayed and observed by the patients by slightly turning their head to the side. The virtual body is illuminated synchronously or asynchronously with respect to the patient's chest movements. The top image represents the end of the expiration with a low flashing intensity, while the bottom image shows the end of the inspiration corresponding to the maximal luminosity in the synchronous condition. A video of the experiment can be found in the supplementary material.