Table 3.
BDNF genotypes and working memory improvement across the three intervention groups.
| Group | Working memory improvement | Met-carriers | Val homozygotes | F | df | P | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| N | Mean | SD | N | Mean | SD | |||||
| Frontal cortex stimulation group | K_T2 at week 1 | 9 | 0.07 | 0.40 | 5 | 0.17 | 0.28 | 0.291 | 1, 11 | 0.600 |
| K_T2 at week 2 | 9 | 0.28 | 0.30 | 5 | 0.21 | 0.28 | 0.219 | 1, 9 | 0.651 | |
| K_T4 at week 1 | 9 | 0.48 | 0.50 | 5 | −0.19 | 0.39 | 7.735 | 1, 10 | 0.019 | |
| K_T4 at week 2 | 9 | 0.58 | 0.51 | 5 | 0.08 | 0.20 | 6.853 | 1, 11 | 0.023 | |
| Parietal cortex stimulation group | K_T2 at week 1 | 11 | 0.10 | 0.23 | 6 | 0.33 | 0.35 | 2.282 | 1, 7 | 0.172 |
| K_T2 at week 2 | 9 | 0.28 | 0.17 | 4 | 0.34 | 0.24 | 0.171 | 1, 4 | 0.698 | |
| K_T4 at week 1 | 11 | 0.10 | 0.57 | 6 | 0.16 | 0.35 | 0.079 | 1, 15 | 0.782 | |
| K_T4 at week 2 | 9 | 0.37 | 0.50 | 4 | 0.99 | 0.38 | 6.091 | 1, 8 | 0.040 | |
| Sham stimulation group | K_T2 at week 1 | 11 | 0.17 | 0.22 | 6 | −0.08 | 0.14 | 8.371 | 1, 14 | 0.012 |
| K_T2 at week 2 | 11 | 0.44 | 0.44 | 6 | −0.01 | 0.12 | 10.082 | 1, 12 | 0.008 | |
| K_T4 at week 1 | 11 | 0.43 | 0.48 | 6 | −0.20 | 0.55 | 5.415 | 1, 9 | 0.044 | |
| K_T4 at week 2 | 11 | 0.53 | 0.60 | 6 | −0.27 | 0.34 | 12.218 | 1, 15 | 0.003 | |
BDNF brain-derived neurotrophic factor, K_T2 Cowan’s K under only two targets condition of the change detection task, K_T4 Cowan’s K under only four targets condition of the change detection task, Filtering efficiency_T2 filtering efficiency for two targets, Filtering efficiency_T4 filtering efficiency for four targets.