This allows the viewer to process the video followed by the audio, and will significantly improve memory for the audio track. If both things happen at once, viewers will remember the pictures and forget the words. Match the audio and video. When audio and video information match, understanding and memory are better. Know how to deal with negative images.
Negative pictures compel attention.
Strong negative images tend to result in strong memory for the negative image, but weak memory for concurrent audio information. In addition, memory is particularly bad for audio information which precedes the negative images. On the other hand, memory is better for audio information which occurs after the negative images are no longer on screen. Take a literal approach. Use concrete words and pictures when possible.