Memory Test
A number flashes on screen. Memorize it, then type it back. Each round it gets one digit longer. How far can your memory stretch?
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The magic number seven
In 1956, the psychologist George Miller published one of the most cited papers in the field, titled "The Magical Number Seven, Plus or Minus Two." He noticed that across many tasks, people could hold only about seven items in short-term memory at once. That is why phone numbers, license plates, and verification codes tend to hover around that length.
This test puts that limit to the work. The forward digit span you just measured is the same task used in clinical batteries like the Wechsler scales to assess attention and short-term memory.
Working memory vs short-term memory
Short-term memory is the brief holding space for information you just took in. Working memory goes a step further: it is the system that holds and manipulates that information, like doing mental math or following directions. Both are central to learning, and both are favorite topics in neuropsychology and cognitive psychology, where memory testing is a core skill.
Try chunking
Want to push your score higher? Group the digits the way you would read a phone number: 4-8-2 ... 9-1-5. Chunking lets your brain treat several digits as one unit, which is the single most effective way to beat the seven-item limit.