Ryan Shaun Joazeiro de Baker, Sidney K. D Mello, Ma. Mercedes T. Rodrigo, Arthur C. Graesser. Better to be frustrated than bored: The incidence, persistence, and impact of learners cognitive-affective states during interactions with three different computer-based learning environments. International Journal of Man-Machine Studies, 68(4):223-241, 2010. [doi]
Abstract is missing.