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Memory span
A memory-span test shows a sequence — often digits — then asks you to repeat it back, growing longer until you slip. It probes working memory, the mental scratchpad you use to hold and juggle information for a few seconds.
These tests are for interest and self-awareness, not a clinical cognitive assessment. Scores swing with sleep, caffeine, stress, practice and your device. Persistent or worsening problems with memory, attention or thinking deserve a doctor's assessment.
The famous "about seven"
A classic idea is that people hold around seven items in short-term memory, give or take a couple. Later work suggests the real capacity for unrehearsed chunks is smaller, nearer four, and that we stretch it by "chunking" — grouping digits into a phone number, say. Repeating a sequence in reverse is harder because it demands manipulation, not just storage.
What it is not
Span tests look at one narrow slice of memory. They do not measure intelligence, and they say nothing about long-term memory — the kind that stores what you did last week. A low score on a tired evening is normal; a persistent, worsening problem with everyday memory is what deserves a doctor's attention.
What sleep loss does to it
Working memory takes a hit when you are short on sleep, and attention wobbles, so you lose the thread of a sequence more easily. Sleep also does the behind-the-scenes work of moving the day's experiences into longer-term storage, which is why cramming without sleep backfires.
Other tests
Reaction time
How fast you respond to a signal — the score most sensitive to tiredness.
The Stroop test
Name the ink colour, not the word — a neat measure of attention and mental control.
"Brain age" tests
A fun score that bundles several quick tasks — take the number with a large pinch of salt.
Source: General cognitive-psychology references on reaction time, working memory, attention and sleep. Not a clinical assessment. · checked 2026-09-04
Frequently asked questions
How can I improve my memory span?
Chunking helps — grouping items into meaningful clusters. Beyond that, the biggest everyday levers are sleep, attention and not trying to hold too much at once. Write things down; that is what working memory would rather you did.
Is a low span a sign of a problem?
Not by itself — it varies with focus, stress and tiredness. Persistent, worsening trouble with everyday memory is the kind worth raising with a doctor.
Track the sleep behind the score
TempoLife tracks your sleep and estimates the debt that slows your reactions and focus.