Symbol Digit Modalities Test

Part of the Thomas D. Stoker Cognitive Test Battery

What to do: A key at the top pairs 9 symbols with the digits 1 to 9. Below it, 90 symbols appear in random order. Type the matching digit for each symbol as quickly as you can.

Work left to right, row by row, without skipping around. Press a digit key to move to the next symbol automatically.

You have 90 seconds. The test ends automatically when time runs out or you complete all 90 items.

First time taking this test? The key takes a moment to learn. Feel free to take it again and use the second set of results.

Key — refer to this throughout the test

Built by Thomas D. Stokerthomasdstoker.com/cognitive-testing
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Symbol Digit Modalities Test | Version 0.003 | Created: 2026-04-01