Working memory is the small mental notepad where you hold and handle information for a few seconds: a phone number you are about to dial, the middle of a sentence, a step in a puzzle.
How much fits
A famous 1956 paper suggested about seven items, give or take two. Later research argues that the true limit is closer to four meaningful chunks when you cannot rehearse or group things. That is why long numbers feel hard and why chunking is so powerful.
Why it matters for intelligence
Working memory is closely linked to fluid reasoning. To solve a logic puzzle you hold several facts at once, test a guess and keep track of what you ruled out. A bigger or better-used notepad lets you juggle more steps. This is why working memory forms part of the Real IQ Test.
Why it lets you down
- Stress and worry steal capacity.
- Tiredness shrinks it.
- Interruptions wipe it clean.
- Multitasking splits it thin.
Using it better
- Chunk. Group digits and facts into meaningful units.
- Write it down. Offload steps to paper so your mind can think instead of store.
- Visualise. Pictures and spatial layouts add extra storage.
- Single-task. One problem at a time.
- Rest. Short breaks and good sleep restore capacity.
Can you train it?
You can get much better at a trained task, and strategies like chunking carry over. Gains in general intelligence are less certain, so treat training as skill-building, not a shortcut.
Curious about your own? The Real IQ Test includes working memory, and Brain Games let you practise.