“…In a series of studies, he varied the novelty, complexity, surprisingness, and incongruity of visual stimuli, and found that each of these collative variables increased attention, arousal, and interest. More broadly, these principles underlie many interventions intended to promote situational interest in educational contexts, which Renninger and Hidi (2016) refer to as “triggers for interest.” For example, various factors triggered situational interest in a college biology class, such as hands-on activities, novelty, surprise, and group work (Palmer, 2009). Similar factors were important in ninth-grade biology classes, where novelty proved most important, but choice, physical activity, and social involvement were also triggers.…”