Wiggins, Joseph, Mayank Kulkarni, Wookhee Min, Bradford Mott, Kristy Boyer, Eric Wiebe, and James Lester. 2018. “Affect-Based Early Prediction of Player Mental Demand and Engagement for Educational Games”. Proceedings of the AAAI Conference on Artificial Intelligence and Interactive Digital Entertainment 14 (1):243-49. https://doi.org/10.1609/aiide.v14i1.13047.