Dr. Ray explained six multimedia learning principles in his video. In my opinion, the spatial& temporal contiguity principle is the best principle that applies to a PowerPoint presentation in a classroom or face-to-face business meeting. When we do a PowerPoint presentation, if the image and words separately, the audience may not follow your step. They need to recall your image or words.

I have intuitively followed the spatial&temporal contiguity principle in the past. From middle school to the present, I did lots of PowerPoint presentations. I found that put images and words together is very effective. As Dr.Ray said, too much spatial increase cognitive load. It may cost too much time in class or meeting. I have broken the coherence principle in the past. I remembered when I was in middle school, I sometimes embed some interesting but irrelevant images to my topic. This causes the audience to pay more attention to the image than to what I’m saying.

Reference:https://www.youtube.com/watch?v=g-sknUVq1mk