Text-based learning media are often used in primary, secondary and university education. Therefore, text designers can support the learner by highlighting the most relevant information by using visual cues. Despite this signaling effect's broad empirical basis, the extent to which the effectiveness of educational signals is dependent on moderator variables, like the design and layout of the text has not been investigated to date. In the current experiment, 138 university students learned about the formation of tsunamis from an instructional text. The text was manipulated in terms of signaling (color cues vs. no color cues) and induced learning-irrelevant extraneous cognitive load (fluent text font vs. disfluent text font). The results revealed that learners who had received the signaled text outperformed those who received the non-signaled text in terms of transfer performance. These results are explained by cognitive load, which was reduced in the signaling condition. The text font had no influence on the learning outcomes. Extraneous load induction further led to higher metacognitive accuracy and invested effort, while cognitive load and frustration were also increased. Interaction effects only occurred in terms of testing time, ease of learning and navigation. Results indicate that signaling is beneficial for transfer performance, independent of the font design of text.
Keywords: Cognitive load; Disfluency; Instructional texts; Learning; Signaling.