HP's G2 Reverb Omnicept edition is a special version of their VR headset targeted for enterprises that includes Tobii eye tracking that can track real-time pupil dilation, eye saccades, visual attention with eye gaze vectors, a camera for facial tracking, as well as photoplethysmogram (PPG) that can measure pulse rate variability and heart rate. Combining these physiological measurements together enables certain human psychological inferences including things like cognitive load that can be correlated to the situational and contextual dimensions of a training scenario, or to measure real-time responses to cognitive effort.