“…Following the differentiation noted byPlass, Homer, and Hayward (2009), we categorize two types of interaction: (a) secondary interaction (e.g., clicking navigational or pace-control buttons) is our definition of affordances that do not learning content; and (b) primary interaction (e.g., dragging and changing the depicted elements), includes the interactivity that affects the learning content.Regarding secondary interaction bias, an example where only the animation was provided with pace-control buttons is the study byWatson, Butterfield, Curran, and Craig (2010) with adult participants learning to assemble an engineering model device. Although the authors did not observe significant differences between the visualizations, statics presented no interaction, but animations included interactive buttons to rewind, fast forward, and pause the depiction.…”