Stroop Test

A color word is shown in a different ink color. Click the button that matches the ink color, not the word itself.

1A word like RED appears in a different color

2Click the button for the ink color (Blue in this case)

320 trials — be fast and accurate

~1 minute · No sign-in required

Trial 1 / 20

👆 Click the INK COLOR, not the word!

RED

—%

Accuracy

LowerAverageHigher

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Correct

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Avg RT

📏 Score Ranges

Excellent

95–100%

Top 10%

Good

80–95%

Above avg

Average

60–80%

Most adults

Struggling

< 60%

Bottom 25%

🎨 About the Stroop Effect

The Stroop effect demonstrates cognitive interference — when the brain processes conflicting information. Reading is automatic; naming colors requires effort.

This test measures executive function and is widely used in clinical neuropsychology.

⚙️ What Affects It?

🧠	Executive Fn.	Strong prefrontal cortex improves interference control.
📖	Reading Level	Stronger readers experience more interference.
😴	Fatigue	Tiredness worsens cognitive control significantly.