“…Among these automatic detection methods, computer vision-based engagement detection is the most popular one, which can offer many ways to detect engagement, such as body behavior, facial expression, head posture, etc [5,6]. For example, Levordashka et al [7] used head posture features (i.e., head yaw, pitch, and roll) to detect cognitive engagement. The advantages of the computer vision-based method, such as real-time, non-invasive, and low-cost, make it suitable for cognitive engagement detection in the classroom [4].…”