Fig. 3.

Three-month sub-composite training performance by intervention group. Between-group differences in the A processing speed training composite, and B working memory training composite as evidenced by Bonferonni-adjusted RM-ANCOVA. Covariates appearing in the model are evaluated at the following values: age = 71.11, sex = 0.45, years of education = 16.19, tDCS group = 0.50. Findings demonstrate that intervention groups did not differ at baseline, both groups improved significantly from baseline to 3 months on working memory training composite, while only the cognitive training group improved significantly on processing speed training composite. The cognitive training group (black) improved significantly compared to the education training group (gray) across both sub-composites