How Many Things Can You Hold in Your Head at Once? The Limits of Working Memory

Ever tried to write down a phone number someone read out, only to lose it halfway? The space our minds use to hold information for a moment is smaller than we think. It is called working memory.

What is working memory?

Working memory holds the information you need right now for a few seconds to a few tens of seconds. Keeping a running total in your head, or remembering “left, then right” while someone gives you directions, both use working memory. Unlike long-term memory, it fades quickly unless you keep rehearsing it.

From “seven” to “about four”

In 1956, psychologist George Miller published a famous paper suggesting that people can hold about seven items, plus or minus two, in mind at once. The idea became known as “the magical number seven.”

Later researchers measured it again while preventing people from quietly grouping or repeating the information. Many of those studies found that we can really hold only about four chunks at a time. The number looked like seven before because people were grouping information without realizing it.

Visual memory works the same way

In experiments where people briefly see several colored squares and then try to remember them, most people accurately recall about three or four. Beyond that, accuracy drops sharply.

The trick that beats the limit: chunking

You cannot easily add more slots to working memory, but you can put more into each slot. This is called chunking.

• Phone numbers: 5551234567 is hard, but 555-123-4567 is just three chunks.
• Letters: C, A, T, D, O, G are six items, but “cat” and “dog” are two.
• Shapes: a scatter of dots becomes one chunk when you see it as an L-shape or a constellation.

Chess masters can memorize a board at a glance for the same reason: they remember familiar patterns of pieces rather than each piece on its own.

Getting the most from working memory

• Group things into sets of three or four
• Link numbers and letters to familiar words or dates
• Write important things down right away, since working memory is not built to hold on for long
• Avoid juggling several tasks, which fills the slots fast

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In one line

You can hold only about four pieces of information in mind at once, but grouping several items into one chunk lets you remember far more.

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