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The Stroop test
In the Stroop test you see colour words printed in mismatched ink — the word "red" written in blue — and must name the ink colour, not read the word. It is a classic measure of attention and inhibition: the ability to hold back an automatic response.
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.
Why it is hard
Reading is so automatic that the word fights the task. Naming the ink means overriding the urge to read, and that conflict slows you down and causes errors — the "Stroop effect". It is a favourite in psychology precisely because it isolates the mental effort of self-control and focus.
What it reflects
A slower Stroop performance is not a defect; it reflects how much work your attention is doing to suppress the automatic response. That workload rises when you are distracted, stressed or tired, which is why the same person's score drifts from day to day.
What sleep loss does to it
Tasks that need you to inhibit an automatic response, like the Stroop, are sensitive to sleep loss. Tired brains are slower to suppress the obvious-but-wrong answer, so both speed and accuracy tend to slip after a poor night.
Other tests
Reaction time
How fast you respond to a signal — the score most sensitive to tiredness.
Memory span
How many items you can hold in mind at once — a window on working memory.
"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
What does the Stroop test measure?
Selective attention and inhibition — your ability to focus on the relevant feature (ink colour) while suppressing a stronger automatic one (reading the word).
Can you get better at the Stroop test?
Practice speeds you up on that specific task, but the underlying conflict never fully disappears — reading stays automatic. Rest and focus matter more than training.
Track the sleep behind the score
TempoLife tracks your sleep and estimates the debt that slows your reactions and focus.