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Attention & Inhibition Tests Online

These tasks stress filtering distractions, stopping prepotent responses, and staying alert over short sessions. Useful for quantified-self check-ins and nootropic experiment baselines — not clinical diagnosis.

• Stroop TestFree Stroop test in your browser. Name the ink color, ignore the word. Timed trials measure selective attention and response inhibition with instant results.
• Flanker TaskFree Eriksen flanker task online. Pick the center arrow while ignoring flanking distractors. Measures selective attention and interference with reaction-time results.
• Go/No-Go TaskFree Go/No-Go task online. Respond to go signals and withhold on no-go trials. Measures impulse control and response inhibition with accuracy and speed scores.
• Psychomotor Vigilance TaskFree Psychomotor Vigilance Task (PVT) online. Stop a timer after random delays. Measures sustained attention, lapses, and simple reaction time.

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