Table 4.
Means response latencies (in millisecond), error rates (in percent), and standard deviations of all relevant measures on working memory tasks (study 2)
| Task | Recreational users | Controls | ||
|---|---|---|---|---|
| Working memory | ||||
| Mental counters | RT | PE | RT | PE |
| 457 (32) | 8.7 (0.2) | 420 (32) | 9.2 (0.2) | |
| Digit span | Accuracy | Accuracy | ||
| Forward | 8.5 (2.2) | 8.0 (1.9) | ||
| Backward | 7.2 (1.5) | 7.7 (1.3) | ||
| N-back | RT | Accuracy | RT | Accuracy |
| 1-back | 476 (61) | 90.3 (10.6) | 485 (53) | 90.1 (10.2) |
| 2-back | 507 (72) | 81.7 (14.3) | 520 (67) | 80.9 (11.1) |
*p < 0.05 (significant group difference)