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Using a remote camera BrainVu records eye and body dynamics of consumers, to extract biomarkers of mental states such as stress, mental load, alertness, attention, response time and sentiment without electrodes or wearables. Leveraging these markers BrainVu has developed a set of indices that can be used to analyse the attentiveness, engagement and sentiment of a consumer to any kind physical, video or online experience. These capabilities provide the crucially needed technology to measure and gauge in real-time the consumer’s true sentiment and engagement towards any digital or physical experience and to adapt these to the current user state.