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The Stop-Signal Task (Logan, 1984) is the cleanest measure of motor inhibition.

Most trials are "go" — press the matching arrow. Rarely, the arrow turns red after a delay (the stop-signal delay, SSD) and you must NOT press.

SSD is adapted dynamically to keep stop success ≈ 50%, allowing computation of SSRT (Stop-Signal Reaction Time) — your inhibition latency.

SSRT under 220ms is excellent. Above 300ms suggests slow inhibition.

Each test is constructed using Item Response Theory (IRT) and Classical Test Theory (CTT) to ensure reliable measurement of knowledge and ability across different difficulty levels.

Questions undergo rigorous review including difficulty calibration, discrimination analysis, and distractor effectiveness evaluation to maintain high assessment quality.

1. Press A for ◀ and L for ▶ as fast as possible.
2. If the arrow turns red, withhold — do not press.
3. Don't wait — fast go is the point. Slowing kills the SSRT measure.
4. Aim for ~50% stop success. The task adapts.