“…FaceReader's analysis is based on Ekman's seven universal facial expression states (Ekman, 1970), and the facial expressions were categorized into positive (happy), negative (sad, angry, scared, and disgusted), surprised, and neutral. It is a commercially available software that has been used in various disciplines and research (e.g., Chiu et al, 2014;Chiu et al, 2019;Lewinski, den Uyl, & Butler, 2014;Liaw et al, 2014;Maison & Pawłowska, 2017;Skiendziel, Rösch, & Schultheiss, 2019;Xie, Yu, Niu, & Li, 2019). The three key segments of students' facial expression videos mentioned above (i.e., E, T, and A) were the explanatory variables.…”