Cognitive Load
The total amount of mental effort being used in working memory at any given time.
Cognitive load is basically having too many browser tabs open in your brain. John Sweller's cognitive load theory breaks it into three types: intrinsic load (the actual difficulty of what you're doing), extraneous load (unnecessary complexity from poor design), and germane load (productive effort that builds lasting knowledge). When your total cognitive load exceeds working memory capacity, performance drops — you start making mistakes, missing details, feeling overwhelmed. The best puzzles and learning experiences manage load carefully, keeping you in the productive challenge zone where you're stretched but not crushed.
Frequently Asked Questions
How do you reduce cognitive load?
Three strategies: simplify the task (reduce intrinsic load), eliminate distractions and unnecessary complexity (reduce extraneous load), and build expertise through practice so familiar patterns become automatic (free up capacity). Chunking information into meaningful groups is one of the most effective techniques.
What happens when cognitive load is too high?
Your working memory overflows. You start forgetting steps mid-task, making errors you wouldn't normally make, and feeling mentally exhausted. Decision quality drops sharply. This is why complex decisions made at the end of a long day tend to be worse than those made fresh.