Part of the Thomas D. Stoker Cognitive Test Battery
Letters will appear one at a time. Press the spacebar whenever the current letter is the same as the letter that appeared two letters ago.
Example:
H → K → H ← press spacebar here (H matches 2 back)
Each letter appears for 1 second, then disappears for 1 second
Press spacebar only when the current letter matches the one from two positions ago
The box will flash green to confirm your spacebar press has registered
60 letters in total
First time? Your score may be lower while you get used to the task. You are welcome to retake the test and use your second set of results.
Press spacebar when the current letter matches the one from two positions ago
Your Results
Metric
Result
2-Back — Date
2-Back — Time
2-Back — Accuracy (%)
2-Back — Average Response Time on Correct Responses (milliseconds)
To save your results: Click the button below, then open your tracking spreadsheet and click on the next empty session column header. Press Ctrl+V (Windows) or Cmd+V (Mac) to paste. Your results will fill down the column automatically.