Complex ideas may be hard to learn in part because their components overflow working memory

Ideas typically build on other ideas. Some directly combine a few prior insights; others might be difficult to express without special notation or terminology. When an idea has few dependencies, you can introduce them all, then immediately express the idea: green means go; red means go; a green or red stoplight pointing right means you can or can’t turn right.

But if you’ve just been introduced to a zoo of new terms, you probably won’t absorb much from a sentence which uses many of those terms at once. You can’t juggle all those terms in working memory at once, and you haven’t had time to encode any of them more durably.

It’s not just a matter of timing. People seem to forget most of what they read, and they mostly don’t notice, so even if you gave yourself time to absorb prerequisite ideas, you’d likely forget many of them.

This may be part of why some topics are so challenging to understand. If you’re trying to learn quantum computing, that requires new notation, new terms, and new concepts. It’s as if you’re reading a book which begins in English, but you find more and more Spanish words and sentences sprinkled in, until suddenly you notice that the whole book’s in Spanish, and you don’t understand any of it. You’ll need to absorb the vocabulary and grammar before you can follow the plot.

Any relatively complicated activity requires holding more information in our heads than short-term memory allows.
(Ericsson and Pool, 2016, p. 61)

More concretely: Learning increasingly complex ideas may amount to forming larger effective chunk sizes


References

Matuschak, A., & Nielsen, M. (2019). How can we develop transformative tools for thought? Retrieved December 2, 2019, from https://numinous.productions/ttft