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The link between childhood harsh parenting and later aggression is well established. However, harsh parenting may occur within the context of nonviolent discipline. Moreover, sympathetic nervous system activity may moderate the effects of harsh parenting on aggression. This study examined whether sympathetic nervous system activity, measured by skin conductance level (SCL), and childhood nonviolent discipline moderate the link between childhood harsh parenting and later aggression among emerging adults. Participants ( N  = 264, mean age = 19.37, 54% females) reported retrospectively on experiences of childhood harsh parenting and nonviolent discipline as well as current anger, hostility, verbal, and physical aggression. We also measured resting SCL. Regression analyses revealed a significant three-way interaction between childhood harsh parenting, nonviolent discipline, and resting SCL accounting for anger and a significant two-way interaction between childhood harsh parenting and resting SCL accounting for hostility. Results suggested that (1) at high levels of resting SCL and low levels of childhood nonviolent discipline and (2) at low levels of resting SCL and high levels of childhood nonviolent discipline, the link between childhood harsh parenting and anger was stronger. Moreover, the association between childhood harsh parenting and hostility was stronger among participants who exhibited high resting SCL. The findings are consistent with the biological sensitivity to context theory. Our study highlighted the importance to examine the influence of both environmental and biological variables underlying emerging adults’ aggression.

Childhood Harsh Parenting and Later Aggression: Non-violent Discipline and Resting Skin Conductance as Moderators