PEBL Hub — IRB Fact Sheet — 2026-08-23
CPT-AX Task
Category:Attention
Duration:~12 minutes
Parameters:10 configurable parameters available
Version:1.0
Input:Keyboard
Description
Context-dependent sustained attention task. Respond to 'X' only when it follows 'A'. Measures context processing and response inhibition.
Example Data Output (4 sample rows)
| sub | block | trial | cond | targ | responded | corr | time | rt |
|---|---|---|---|---|---|---|---|---|
| 1616 | 1 | 1 | 5000 | Q | 1 | 0 | 16227 | 365 |
| 1616 | 1 | 2 | 5000 | R | 0 | 1 | 21228 | -1 |
| 1616 | 1 | 3 | 5000 | A | 0 | 1 | 26229 | -1 |
| 1616 | 1 | 4 | 5000 | X | 1 | 1 | 31232 | 375 |
References
Cohen, J. D., Barch, D. M., Carter, C., & Servan-Schreiber, D. (1999). Context-processing deficits in schizophrenia. Schizophrenia Research, 43(2-3), 127-143.