Fig. 2: MMN amplitude, BDNF genotypes and working memory.

Comparison of working memory capacity (A) and MMN amplitude (B) between the two genotype groups. C–F Correlations between working memory capacity and MMN amplitude across the genotype groups. Effects of BDNF genotypes on working memory capacity improvement in the prefrontal stimulation group (G), the parietal stimulation group (H) and the sham stimulation group (I). MMN, mismatch negativity; BDNF, brain-derived neurotrophic factor; K_T4, Cowan’s K under only four targets condition of the change detection task; K_T2, Cowan’s K under only two targets condition of the change detection task; T2_W1, only two targets condition of the change detection task at week 1; T2_W2, only two targets condition of the change detection task at week 2; T4_W1, only four targets condition of the change detection task at week 1; T4_W2, only four targets condition of the change detection task at week 2. *P < 0.05, ** P < 0.01, NS., not significant.