Fig. 3.

Central amygdala gray matter density mediates the relationship between OXTR methylation and HF-HRV. Figure 3 illustrates the mediational relationship between OXTR methylation, parasympathetic nervous system activity (log HF-HRV) and central amygdala gray matter. Path c reflects the total effect of the predictor on the dependent variable, while path c’ reflects the direct effect and paths ab reflect the indirect effect of the mediator, ns = not significant, ^* corresponds to a P value smaller than the significance level of 0.05.