选择反应时间

Choice RT separates raw neural speed from stimulus-response mapping speed.

Hick's Law: RT increases linearly with the log of choices. 4-choice is ~150ms slower than 1-choice.

Practice automates the mapping — eventually the response feels involuntary.

Combined with simple RT, the two give a fuller speed profile.

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. Watch the row of slots.
2. When a slot turns green, press the key labeled below it.
3. Press only when a slot lights up — premature presses are false starts.
4. Speed and accuracy both score.