“…Studies that focused on the association between childhood maltreatment and ANS reactivity to psychosocial stressors mainly reveal physiological hyper‐ reactivity in response to stressors (i.e., overarousal) following childhood maltreatment (e.g., Heim et al, ; Dale et al, ), but hypo‐ reactivity (i.e., underarousal) has also been found (e.g., Ginty, Masters, Nelson, Kaye, & Conklin, ). In addition, three studies examined the impact of (stress inducing) infant emotional signals on parental ANS reactivity (Buisman et al, ; Casanova et al, ; Reijman et al, ).…”