This study researched whether adding story elements to an instructional video affects motivation, emotional engagement, and learning. In the research, they explain that they did not find any difference between a well-produced instructional video and a storified instructional video.
However, the storified video feels very artificial to me. This isn't a story about a relevant character the learners can identify with who uses the concepts in realistic situations (or even slightly exaggerated ones). This is about a fake detective agency. I'd be cautious about assuming this research applies to realistic stories as well.
Study examining what happens when you remove common elements of instruction. Practice with feedback was critical; information, objectives, examples, and review made little difference.
"This study investigated the effects of several elements of instruction (objectives, information, practice, examples and review) when they were combined in a systematic manner." "Results indicated participants who used one of the four versions of the computer program that included practice performed significantly better on the posttest and had consistently more positive attitudes than those who did not receive practice."
Summary of research which compared courses with the same content but with specific elements of Gagne's instructional events removed. The strongest correlation with student performance and satisfaction was with practice with feedback. (This is an old post, but it's moved since I originally bookmarked it.)
A reading list for instructional designers, especially those of us doing the "informal masters" on our own rather than enrolling. More than just instructional design, this list includes project management, psychology of learning, and other topics.
Related link: http://www.dctrcurry.com/2008/02/immediately-accessible-instructional.html