“…Consistent with this notion, high resting RSA has been linked to appropriate emotional reactivity (Stifter & Fox, 1990), children's social engagement (Fox & Field, 1989), social competence (Eisenberg, Fabes, Murphy, Maszk, Smith, & Karbon, 1995), and enhanced attentional ability . Several studies have linked high RSA in newborns with positive developmental outcomes, suggesting that high RSA is an important physiological marker of appropriate engagement with the environment (Hofheimer, Wood, Porges, Pearson, & Lawson, 1995). In contrast children with low RSA have been considered at risk because they may have difficulty attending and reacting to environmental stimuli (Porges, 1991;Wilson & Gottman, 1996).…”