Partial correlational analysis was conducted to investigate the associations between delayed recall performance on the RCFT and 3 connectivity (prefrontal midline-parietal-occipital midline, left prefrontal-parietal-occipital midline, and left frontal-left frontal area in the upper alpha band) where the most significant differences between the BD and non-BD groups were observed. In the BD group, a positive correlation (r = 0.41, p = 0.012) was observed between the delayed recall score on the RCFT and the connectivity of electrodes AF3-POz (left prefrontal-parietal-occipital midline; Figure 2). However, there was no significant correlation between the delayed recall score on the RCFT and connectivity in the non-BD group. There were no significant outliers, and the normal distribution of the variables was confirmed by the Kolmogorov–Smirnova test.
