Free online Stroop Task with 6 colors (red/green/blue/yellow/orange/purple), 30 trials per round. A color word is displayed, but its ink color may differ from its meaning — click the button matching the ink color, not the word. The incongruent condition activates the prefrontal inhibitory control circuit, a classic neuroscience paradigm for training cognitive flexibility. Tracks accuracy and average response time, with congruent vs. incongruent breakdown and personal best.
Click Start, then select the button matching the ink color (ignore the word meaning)
❓ FAQ
What ability does the Stroop Task train?
The Stroop Task primarily trains inhibitory control — suppressing the automatic reading response to perform a color judgment instead. This is governed by the dorsolateral prefrontal cortex (dlPFC) and anterior cingulate cortex (ACC), core components of executive function.
Why is the incongruent condition harder?
Reading is highly automatic — seeing the word 'RED' automatically activates the concept of red. When the ink is blue, you must actively suppress the word meaning, creating cognitive conflict (the Stroop effect) that increases response time. This conflict is exactly what makes it valuable for training.
What is a normal response time?
Congruent condition averages 400–600ms; incongruent averages 600–900ms. The difference (Stroop effect size) is typically 100–300ms. With training, incongruent response times gradually decrease and the effect size shrinks.
How long should I train each day?
Research suggests 5–10 minutes per session, 3–5 times per week. Over-training causes fatigue and reduces performance. Cognitive training works best combined with adequate sleep and aerobic exercise.