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Correlation between cognitive task performance (ΔWRT score) and EEG coherence (Coh) in the LF (A) and HF (B) in the fronto-central area/temporo-parieto-occipital after AtDCS. The bold arrows represent the coherences under examination. Single data are represented as diamonds. Solid lines represent the linear regression fit. The correlation coefficient (r2) is reported in each panel.
