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What Is Working Memory? The Science Behind Short-Term Recall

April 5, 2026·6 min read

Working Memory: Your Brain's Notepad

Working memory is the cognitive system responsible for temporarily holding and manipulating information. It's what you use when you remember a phone number long enough to dial it, or when you do mental arithmetic.

Miller's Law: The Magic Number 7±2

In 1956, psychologist George Miller published one of the most cited papers in cognitive science: "The Magical Number Seven, Plus or Minus Two." He found that the average person can hold 7 ± 2 items in working memory simultaneously.

This is why:

  • Phone numbers are 7 digits
  • Most people can remember 5-9 items on a grocery list without writing them down
  • Our Number Memory test shows most people max out at 7-9 digits

How Working Memory Works

Working memory has several components (according to Baddeley's model):

  • Central Executive — Controls attention and coordinates information
  • Phonological Loop — Processes verbal and acoustic information (the voice in your head)
  • Visuospatial Sketchpad — Handles visual and spatial information
  • Episodic Buffer — Integrates information from different sources

    • Can You Improve Working Memory?

    Research is mixed, but several strategies show promise:

    Chunking

    Instead of remembering 8-0-0-5-5-5-1-2-3-4, remember 800-555-1234. Chunking transforms 10 individual items into 3 meaningful groups.

    Spaced Repetition

    Reviewing information at increasing intervals strengthens memory traces. This is the science behind flashcard apps.

    Dual N-Back Training

    Some studies suggest that dual n-back training can improve fluid intelligence and working memory capacity by 10-15%. Results are debated but promising.

    Physical Exercise

    Aerobic exercise increases BDNF (brain-derived neurotrophic factor), which supports memory formation and neural growth.

    Test Your Working Memory

    Try our Number Memory and Visual Memory tests to assess your working memory capacity. The Number Memory test specifically measures your digit span — a classic working memory assessment used in clinical psychology.