AttentivU is a wearable device in the form factor of a pair of glasses, which senses brain activity EEG as well EOG to measure different cognitive processes in real time, including cognitive load, fatigue, engagement, and focus. The device can be used for passive or active interventions, for example to monitor the state of the user, providing gentle audio or haptic feedback when the user is less attentive or adapting the environment when cognitive overload is detected.