During the COVID-19 pandemic, almost all learning activities, as well as other daily face-to-face activities, were moved to online environments. Although e-learning has many advantages, it also has some disadvantages when compared to traditional face-to-face education. Lack of direct contact between teachers and students and less active participation with respect to face-to-face lectures. This led to the first new difficulties in deciphering common student states, such as boredom, confusion, and frustration. In this regard, technological support that can accurately and efficiently detect the level of attention of their students online can therefore be of great help to remote teachers. In this way, they could change their teaching approach dynamically and adopt techniques of capturing the attention of the students when necessary, increasing the effectiveness of the lessons themselves.