🧠 Memory Test
Challenge your short-term memory with three modes: Pattern Grid, Number Sequence, and Colour Sequence. How far can you go?
George A. Miller (1956) found that short-term memory holds 7 ± 2 items. This test measures where your capacity falls.
Three Ways to Test Your Short-Term Memory Online
Pattern Grid tests your spatial working memory by briefly showing highlighted cells on a 4×4 grid, then asking you to reproduce the pattern. This type of memory is handled primarily by the visuospatial sketchpad component of working memory — the same system used when reading a map, parking a car, or following a visual recipe.
Number Sequence tests verbal working memory. A growing sequence of digits is displayed briefly, then you must type them back in order. This mirrors how we hold a phone number in mind long enough to dial it. Colour Sequence (our Simon-style mode) adds a sequential challenge: you must not only remember which colours appeared but in what order — taxing both memory and attention simultaneously.
Understanding Miller's Law and Working Memory Capacity
George A. Miller's landmark 1956 paper "The Magical Number Seven, Plus or Minus Two" established that short-term memory typically holds 5–9 items. More recent research by Nelson Cowan (2001) refined this to approximately 4 "chunks" — meaningful groups of information. Our test starts at level 1 (2 items) and increases by one item per level, so level 7 corresponds exactly to Miller's average.
Reaching level 9 places you above Miller's upper bound, indicating an above-average working memory capacity. Level 5 or below suggests a more limited capacity, which is perfectly normal and compensable through strategies like chunking (grouping digits into meaningful sets) and association (linking items to things you already know).
How to Improve Your Memory Score Over Time
The most effective single change most people can make is improving sleep quality. Memory consolidation — the transfer of working memory into long-term storage — happens primarily during slow-wave and REM sleep. Even one night of poor sleep can reduce working memory capacity by up to 30%. Beyond sleep, regular aerobic exercise has been shown to increase hippocampal volume and improve memory performance measurably.
Mentally, chunking is the most powerful immediate strategy. Instead of remembering 8 individual digits, group them: 38 47 19 02 is four chunks, not eight items. Mnemonics, method-of-loci (memory palace) techniques, and spaced repetition practice all expand your effective working memory over weeks of consistent training.