Working memory vs. short-term memory
Short-term memory simply stores a few items briefly. Working memory goes further: it holds information and works on it — doing mental arithmetic, following directions, or keeping a sentence in mind while you reply. It's the bottleneck for reasoning, comprehension and learning.
Capacity and limits
Working memory is small. Classic estimates put it at about 7 items, but modern research suggests the true limit is closer to 4 chunks of information at once. Anything beyond that needs chunking, rehearsal, or offloading to paper. This tiny capacity is exactly why interruptions are so costly — they evict whatever you were holding.
How working memory is tested
Common measures include digit span (our Number Memory test), spatial span (our Visual Memory test), and pattern recall (our Sequence Memory test). Each loads a different component — verbal, spatial, or sequential — so a full picture comes from running several.
Can you improve it?
Raw capacity is fairly fixed, but you can use it far more efficiently through chunking, mnemonic strategies, and reducing distraction. Sleep and aerobic fitness also support working memory performance day to day.
Frequently asked questions
What is working memory in simple terms?
It's the brain's short-term workspace for holding and using information while you think, like a mental scratchpad.
How many things can working memory hold?
Older estimates say about 7 items, but modern research suggests around 4 chunks at once.
What's the difference between working and short-term memory?
Short-term memory only stores items; working memory both stores and manipulates them.
How can I test my working memory?
Try digit span, spatial span and pattern-recall tasks — the Number, Visual and Sequence Memory tests here cover all three.