The CONTRAST project tries to help the millions of people who experience a stroke recover their cognitive functions through the Human Comuputer Interface (HCI). CONTRAST has developed an easy-to-use auto-adaptive human-machine interface for the sub-acute rehabilitation phase. How does it work in practice? The patient sets up a headset with electrodes, while the computer is Connected to the doctor's headset. The HCI gives "bio/neurofeedback" – i.e. sends information aggregated from different sources (EEG, heart rate,) to the doctor.