Captions are great. They have played a huge part in the worldwide phenomenon known as memes. This is the principle of contiguity at work, where corresponding printed words and graphics are placed near rather than far from each other.
Chapters originated in the era of classical antiquity and their benefits have persisted ever since. Breaking content into bite-size chunks helps people by (1) organizing information, and (2) allowing them time to reflect on what they have just consumed.
When we see on-screen text, we read it, taking in the information through our visual channel. But if someone is also reading it to us, it is like an assault on our verbal channel - we cannot easily block it out, and suddenly the processing demands have exceeded our capacity to process.This is where the principle of Redundancy can help.
The result of implementing Marie Kondo's incredibly simple, but powerful, KonMari method is a decluttering of your home, and by extension your life. This is at the heart of the learning design principle of Coherence, which can help us reduce extraneous processing. A learning designer applying this principle is focused on weeding out words, graphics, animations, and sounds that are not central to the learning outcomes.