Effortful control, the ability to suppress a dominant response to perform a subdominant response, was assessed in 106 children during early childhood (at 22, 33, and 45 months) using multitask behavioral batteries. By 45 months, effortful control was highly longitudinally stable and coherent across tasks and thus appeared to be a traitlike characteristic of children's personality. Children who had been less intense in terms of proneness to anger and joy, and those who had been more inhibited to the unfamiliar in the second year developed higher effortful control. Children with higher effortful control at 22-45 months developed stronger consciences at 56 months and displayed fewer externalizing problems at 73 months. Effortful control mediated the oft-reported relations between maternal power assertion and impaired conscience development in children, even when child management difficulty was controlled.

Socialization research is shifting from direct links between parenting and children's outcomes toward models that consider parenting in the context of other factors. This study proposed that the effects of maternal responsive, gentle parenting on child conscience are moderated by the quality of their relationship, specifically, early security. A 2-process model of early conscience development was proposed and confirmed in this longitudinal study. The child's security and trust in the caregiver, assessed at 14 months in the Strange Situation, rendered him or her receptive and eager to accept the caregiver's socialization agenda. That early security then enhanced the effectiveness of parental adaptive parenting style, observed from 14 to 45 months, in terms of promoting conscience at 56 months, which encompassed moral conduct, moral cognition, and moral self.