“…In future work, we will study the effect of higher levels of frustration on the learning factors. Other sources of frustration can also be explored, including task difficulty itself (Rosenzweig, 1938), time pressure (Wahlström, Hagberg, Johnson, Svensson, & Rempel, 2002), ineffective or irrelevant feedback (Baylor & Rosenberg-Kima, 2006; McKinney, 1933), or human-computer interaction issues (Klein et al, 2002; Powers et al, 2011).…”