Замена символов

Digit Symbol Coding is a subtest of the Wechsler intelligence scales. It's the cleanest measure of pure processing speed available.

You memorize a small key (digit→symbol) and then match items as fast as possible.

Performance improves with practice as you internalize the key — eventually retrieval becomes automatic.

Used in clinical settings to detect attention/speed deficits in concussion, depression, and aging.

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. Study the digit→symbol key shown at the top.
2. For each digit, tap the matching symbol from four options.
3. You're scored on speed × accuracy.
4. Aim to internalize the key — by the end, you shouldn't need to look back.