“…22 studies (20%) reported the use of the real-life behavior of students, such as physical movement (Nguyen et al, 2012) or music performance (Kão and Niitsoo, 2014), and 12 studies (11%) involved built-in questionnaires or other similar tools to obtain additional student characteristics. Finally, one study (Inventado et al, 2010) applied EEG (electronic encephalogram) to obtain additional student data, which was classified as "other" type of data.…”