“…The vagus nerve is the primary nerve of the PNS and a major inhibitory pathway adaptively regulating inflammatory, immune, endocrine, and cardiovascular function (Thayer and Sternberg, 2006; Thayer and Lane, 2009; Jarczok et al , 2014). RVA, indexed by time- or frequency-domain measures of heart rate variability (HRV) reflecting fast parasympathetic modulation of autonomic control of the heart, is inversely related to affective instability in daily life (Koval et al , 2013), self-reports on difficulties in emotion regulation (Berna et al , 2014; Beauchaine, 2015; Williams et al , 2015) and depression severity in adults (Kemp et al , 2010). Functional neuroimaging studies and human lesion studies have shown several fronto-limbic brain regions and networks involved in the neural control of RVA (Thayer et al , 2012).…”