“…Emotiv provides as direct output frustration and excitement in [11], long-term excitement, instantaneous excitement and engagement in [4,13] and excitement, engagement, boredom, meditation and frustration in [5] through its simple interface. In some cases information from the Emotiv sensor about the raw EEG and wave variations are combined with the information provided by other biological or non biological sensors, resulting in different types of emotion representation: anger, disgust, fear, happiness, sadness, joy, despisal, stress, concentration and excitement in [8], positive, negative and neutral state of mind in [3,20].…”