The modality effect occurs when audio/visual instructions are superior to visual only instructions. The effect was explored in two experiments conducted within a cognitive load theory framework. In Experiment 1, two groups of primary school students (N ¼ 24) were presented with either audio/visual or visual only instructions on how to read a temperature graph. The group presented with visual text and a diagram rather than audio text and a diagram was superior, reversing most previous data on the modality effect. It was hypothesized that the reason for the reversal was that the transitory auditory text component was too long to be processed easily in working memory compared to more permanent written information. Experiment 2 (N ¼ 64) replicated the experiment with the variation of a reduced length of both auditory and visual text instructions. Results indicated a reinstatement of the modality effect with audio/visual instructions proving superior to visual only instructions.

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Based on cognitive load theory, two experiments investigated the conditions under which audiovisualbased instruction may be an effective or an ineffective instructional technique. Results from Experiment 1 indicated that visual with audio presentations were superior to equivalent visual-only presentations. In this experiment, neither the auditory nor the visual material could be understood in isolation. Both sources of information were interrelated and were essential to render the material intelligible. In contrast, Experiment 2 demonstrated that a non-essential explanatory text, presented aurally with similar written text contained in a diagram, hindered learning. This result was obtained because when compared to a diagram only format, the aural material was unnecessary and therefore created a redundancy effect. Differences between groups were stronger when information was high in complexity. It was concluded that the effectiveness of multimedia instruction depends very much on how and when auditory information is used.

Gesturally controlled information and communication technologies, such as tablet devices, are becoming increasingly popular tools for teaching and learning. Based on the theoretical frameworks of cognitive load and embodied cognition, this study investigated the impact of explicit instructions to trace out elements of tablet-based worked examples on mathematical problem-solving. Participants were 61 primary school children (8-11 years), who studied worked examples on an iPad either by tracing temperature graphs with their index finger or without such tracing. Results confirmed the main hypothesis that finger tracing as a form of biologically primary knowledge would support the construction of biologically secondary knowledge needed to understand temperature graphs. Children in the tracing condition achieved higher performance on transfer test questions. The theoretical and practical implications of the results are discussed.

Interactions among the imagination, expertise reversal, and element interactivity effects were investigated in 2 experiments. In Experiment 1, less knowledgeable primary school students learning to use a bus timetable produced better performance under study than imagination conditions, but an increase in their experience reversed the result, producing the imagination effect. Experiment 2, in which students were taught to use a temperature line graph, replicated these results and demonstrated that the effects were more likely to be obtained using complex material. It was concluded that learners can engage more successfully in imagination procedures when learning has proceeded sufficiently to permit the information to be processed in working memory and that working memory limitations are of little consequence except when dealing with complex information.