“…We found only one study that specifically examined associations between parental socialization of emotion and child resting RSA: Kennedy, Rubin, Hastings, and Maisel () did not find that supportive parenting at age 2 significantly predicted resting RSA at age 4. There has been more research examining relations between parental socialization of emotion and RSA reactivity across the developmental spectrum, with parental socialization of emotion showing both significant (e.g., Calkins, Smith, Gill, & Johnson, ; El‐Sheikh, ; Gottman, Katz, & Hooven, ; Miller et al, ) and non‐significant (e.g., Breaux, McQuade, Harvey, & Zakarian, ; Calkins et al, ; Hastings, Klimes‐Dougan, Kendziora, Brand, & Zahn‐Waxler, ; McQuade & Breaux, ; Perry, Calkins, Nelson, Leerkes, & Markovitch, ) associations with RSA reactivity. It is important to note that RSA reactivity, though related to resting RSA, is conceptually distinct.…”