27. R.E.Mayer and R.B Anderson, “Animations Need Narrations: An Experimental Test of a Dual-Coding Hypothesis,” Journal of Educational Psychology 83 (1991): 484-490; Mayer and Anderson, “The Instructive Animation: Helping Students Build Connections Between Words and Pictures in Multimedia Learning,” Journal of Educational Psychology 84 (1992): 444-452; R.E. Mayer, “Systematic Thinking Fostered by Illustrations in Scientific Text, Journal of Educational Psychology 81 (1989): 240-246; R.E. Mayer and J.K. Gallini, “When Is an Illustration Worth Ten Thousand Words?”, Journal of Educational Psychology 82 (1990): 715-726.


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