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Go/No-Go measures inhibitory control — the ability to stop a prepared response when a rare signal appears.

Because most trials are "go", the motor response becomes automatic. The "no-go" signal forces you to abort mid-impulse.

False alarms (responding to no-go) indicate lapses in control. Omissions (missing go targets) reflect vigilance drops.

Train it for better impulse regulation and sustained attention.

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. Tap (or press Space) for every letter — EXCEPT the letter X.
2. X is shown in red to help.
3. Be fast but not reflexive.
4. Omissions and false alarms are tracked separately.