“…Secondly, based on the theorized role of the vagus in social engagement (Bazhenova et al, 2001;Hastings et al, 2008;Miller et al, 2013;Porges, 2003) and the motivational systems of care and affiliation (Depue & Morrone-Strupinsky, 2005;Feldman & Eidelman, 2003;Kemp et al, 2012;Norman et al, 2011;Panksepp, 2011;Tribollet et al, 1989;Uvnäs-Moberg, 1994, 1998, as well as earlier studies which had linked incidental upregulation of HF-HRV to altruistic feelings and behaviors (Barraza et al, 2015;Miller et al, 2015;Stellar et al, 2015) we hypothesized that individual differences in the ability to deliberately up-regulate LP would be linked to individual differences in altruistic behavior. We operationalized altruistic behavior through a multi-method approach that identified a latent construct called Altruistically Motivated Behavior (AMB) which includes several commonly-used behavioral measures of altruistic behavior (Böckler et al, 2016).…”