Table 2.
Task performance.
| CON | SCZ | t | p-Value | |
|---|---|---|---|---|
| In-scanner—accuracy (SD) | ||||
| 0-back | 0.91 (0.09) | 0.76 (0.18) | 4.105 | <0.001 |
| 2-back | 0.88 (0.07) | 0.73 (0.17) | 4.609 | <0.001 |
| Outside-scanner—composite (all subjects) | ||||
| Working memorya | 0.39 (0.36) | −0.47 (1.29) | 3.470 | 0.001 |
| Attentionb | 0.74 (1.01) | −0.89 (1.89) | 4.074 | <0.001 |
Cognitive scores were determined based on the results of working memory and attention related cognitive tasks, including the Penn Abstraction, Inhibition and Working Memory Task (AIM), Penn Continuous Performance Test-Number and Letter Version (CPT), and Letter-N-Back (LNB).
aA composite working memory performance score was calculated by z-scoring the true positive rate for the LNB 1-back and 2-back conditions and summing with the z-score of the true positive rate of the working memory portion of the AIM task.
bAn attention score was generated by z-scoring the accuracy (all correct responses/all trials) of the CPT task results.