Cognitive Load: Why Your Working Memory Fills Up

Working memory has a small and fairly fixed capacity. Almost every practical technique for thinking better is really a technique for using that limited capacity more efficiently.

The capacity constraint

Working memory is the small amount of information you can actively hold and manipulate at once. Early estimates put the limit around seven items; more recent work suggests around four chunks for most material. Crucially the limit is measured in chunks, not raw items, and a chunk can be as large as your existing knowledge allows. An experienced reader processes a familiar phrase as one chunk where a beginner processes each letter separately. This is why expertise feels like having more mental capacity - functionally, it does.

Three types of load

Cognitive load theory distinguishes three. Intrinsic load is the inherent complexity of the material itself and cannot be reduced without changing what you are learning. Extraneous load comes from how information is presented - poor layout, unnecessary jargon, split attention between a diagram and its caption on another page. Germane load is the effortful processing that actually builds understanding. The practical goal is to strip extraneous load so that capacity is available for germane processing.

Reducing the load that does not help

Externalise anything you are holding in mind purely to avoid forgetting it - a written list frees capacity immediately. Do one thing at a time, since task switching carries a real and repeatedly measured cost. Reduce visual clutter in your workspace and on screen. Build chunks deliberately through repetition, because automating a sub-skill removes it from working memory entirely. And accept that intrinsic load has a floor: genuinely difficult material feels difficult, and that feeling is not a sign you are doing it wrong.

Where a supplement fits here

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