There are a number of instructional design and cognitive theories, but Florida Institute of Technology is using Mayer’s Cognitive Theory of Multi-Media Learning for instructional design.
“This theory posits the following:
The brain processes auditory and visual information differently
There are limits to how much auditory and visual information people can process
People must be actively engaged in order to move knowledge from working memory to long-term memory”
While seemingly an expanded view of experiential or action learning, both theories were developed long before recorded audio and video were being used extensively for learning. Processing of audio and video is very different, and the theory suggests that video images provides an extra layer of difficulty (or required filter) to process content that might inhibit learning.
Recommendations for efficacy are recommended:
“Short, focused lessons
Proper balance of text, image, and narration
Think like an instructional designer”
Full article at Faculty Focus, link below.