Further, we assessed the different contribution of regional coherence for spontaneous brain activity in the DMN to IR and DR. Based on the above results, the critical areas of the DMN [whose ReHo values showed a significant correlation with episodic memory performance (AVLT-TR)], including the PHG, mPFC, PCC/PCu, and IPL, were defined as ROIs. After extracting the mean ReHo value in each ROI, correlations between the ReHo measures of four ROIs, and IR and DR scores, respectively, were calculated. Significant correlations between ReHo values and memory were observed. As shown in Figure 2, IR score was positively correlated with ReHo values in the IPL (r = 0.315, p = 0.010) and negatively correlated with ReHo values in the PHG (r = -0.301, p = 0.014) and MFG (r = -0.274, p = 0.026). ReHo in two regions showed a significant positive correlation with DR scores, including the PCC/PCu (r = 0.293, p = 0.017) and IPL (r = 0.355, p = 0.003), while negative correlations were found within the PHG (r = -0.526, p < 0.001).
