Stroop Test
Covered skills
Relevant for
Great for assessing attention control when faced with conflicting information.
Description
The Stroop Test measures selective attention and response inhibition through a color-word interference task. It is based on the Stroop effect, first documented by John Ridley Stroop in 1935, and quantifies the degree to which automatic reading interferes with color identification under time pressure.
How It Works
Color words appear on screen printed in colored ink. You identify the ink color by clicking the corresponding button, not the word itself. When the word and ink color conflict — for example the word RED printed in green ink — the correct response is green. The session runs for 60 seconds. You complete as many trials as possible within the duration.
What Gets Measured
Accuracy — proportion of correct ink color identifications across all trials.
Processing speed — number of trials completed within the 60 second duration.
Interference effect — performance difference between congruent trials where word and ink color match and incongruent trials where they conflict, reflecting the measurable cost of automatic reading on color naming.
Understanding Your Results
The interference effect — slower or less accurate responses on incongruent than congruent trials — is present in virtually all individuals and reflects the automaticity of reading rather than an attention deficit. A larger interference effect indicates greater susceptibility to automatic response competition. Accuracy maintained across incongruent trials despite slower response times reflects a conservative response strategy prioritizing correctness over speed.
Limitations
This test measures the Stroop interference effect within a color-word format specifically. The classic Stroop paradigm is one of the most replicated findings in cognitive psychology, but browser-based implementations introduce display timing variability that affects precision compared to laboratory conditions. Results are sensitive to reading fluency — individuals with lower reading automaticity may show reduced interference effects without this reflecting superior inhibitory control. This is not a clinical assessment and results should not be used to draw diagnostic conclusions.
Related Tests
Focus Meter — sustained visual attention
Go/No-Go Test — response inhibition