“…In different areas, as industrial monitoring, sensor networks, robotics, signal processing, computer vision, pattern recognition, text mining, information security, diagnosis and medical supervision (Pimentel et al, 2014;Oliveira, Moisés A. et al, 2020), studies in the scope of ND has contributed to the development of intelligent systems. In the field of affective computing, natural verbal and non-verbal signals of human emotions, cognitions, perceptions and behaviors are used in the production of efficient and satisfactory interaction systems between man and machine, where the human face is used of several applications (Calvo and D'Mello, 2010;Chatterjee and Chandran, 2016).…”