Cognitive load
working-memory limits in learning
Cognitive load is how much your working memory holds at once — it fills up, and then nothing gets in.
What it is
Working memory holds only a few elements at once. A lesson that asks you to hold more than that — new steps, new vocabulary, a diagram and a spoken explanation simultaneously — overflows rather than being difficult.
The split worth remembering: the load inherent in the material, the load the presentation adds for no reason, and the load that actually builds understanding. Only the third is worth spending.
What makes lessons harder than they need to be
Split attention: the explanation here and the thing it refers to over there, so you must hold one while hunting for the other. Putting the caption inside the diagram removes a load that feels invisible until you measure it.
Redundancy: text you both read and hear, a worked example restating a step already shown, decoration carrying no information. Each costs a little working memory and none gives anything back.
How to use it
When a page will not land, check the load before checking your effort: how many separate things must be held at once, and which of them the material put there for no reason.
Study worked examples closely while you are new to a procedure, then gradually remove them. Keeping scaffolding after you have it wastes the session; dropping it before you have it overflows the session.
Common mistakes
- Reading a hard session as a limit in yourself. Frequently it is the shape of the material, and reformatting it is cheaper than grinding.
- Treating multitasking as extra capacity. Splitting attention between a lecture and a phone does not use two channels; it halves one.
- Cutting everything that feels like filler — including the retrieval effort that was doing the work.
Things you can try today
- Reopen notes you could not follow and count what you had to hold at once. Rewrite the two things that could sit side by side on the page.
- When learning a new procedure, keep the worked example and the problem on the same view, not on facing pages.
- If nothing is landing, take the smallest sub-part of it and finish only that.