Table 2.
Performance on the Categorization Task (CT).
| Training (n = 17) | Control (n = 16)a | |||||
|---|---|---|---|---|---|---|
| Session | Mean | SD | Mean | SD | ||
| Reaction times (ms) | Switching trials | Pretest | 1765.16 | 288.39 | 1664.82 | 247.99 |
| Posttest | 1252.02 | 188.66 | 1546.84 | 243.33 | ||
| Follow-up | 1433.37 | 248.93 | 1578.49 | 247.33 | ||
| Repetition trials | Pretest | 1591.12 | 232.83 | 1495.24 | 235.11 | |
| Posttest | 1141.50 | 186.68 | 1394.55 | 219.47 | ||
| Follow-up | 1281.42 | 190.07 | 1418.19 | 222.51 | ||
| Single-task trials | Pretest | 1301.28 | 257.79 | 1214.46 | 271.76 | |
| Posttest | 1007.01 | 164.18 | 1156.05 | 196.77 | ||
| Follow-up | 1139.02 | 202.16 | 1212.46 | 233.20 | ||
| Switching cost | Pretest | 174.04 | 115.84 | 169.59 | 88.41 | |
| Posttest | 110.52 | 50.31 | 152.28 | 86.73 | ||
| Follow-up | 151.96 | 109.07 | 160.30 | 112.10 | ||
| Mixing cost | Pretest | 289.83 | 128.13 | 280.78 | 173.36 | |
| Posttest | 134.49 | 76.55 | 238.50 | 146.62 | ||
| Follow-up | 142.40 | 121.03 | 205.74 | 172.63 | ||
| Correct responses (%) | Switching trials | Pretest | 84.89 | 10.81 | 89.67 | 4.65 |
| Posttest | 96.98 | 4.77 | 93.75 | 4.94 | ||
| Follow-up | 98.04 | 2.25 | 93.61 | 5.67 | ||
| Repetition trials | Pretest | 89.54 | 7.27 | 93.84 | 4.78 | |
| Posttest | 98.04 | 3.58 | 95.49 | 4.26 | ||
| Follow-up | 98.12 | 1.83 | 93.70 | 5.55 | ||
| Single-task trials | Pretest | 91.25 | 5.10 | 94.45 | 4.40 | |
| Posttest | 99.04 | 0.94 | 97.34 | 2.70 | ||
| Follow-up | 98.24 | 2.21 | 96.00 | 4.28 | ||
| Switching cost | Pretest | −4.66 | 7.12 | −4.17 | 4.89 | |
| Posttest | −1.06 | 1.87 | −1.74 | 2.98 | ||
| Follow-up | −0.08 | 2.43 | −0.09 | 3.26 | ||
| Mixing cost | Pretest | −1.71 | 5.57 | −0.62 | 5.52 | |
| Posttest | −1.00 | 3.85 | −1.86 | 2.77 | ||
| Follow-up | −0.11 | 3.00 | −2.30 | 5.97 | ||
a
One participant in the control group declined to participate in the follow-up, leading to a sample size of 15 at that measurement point.