Explored genetic and environmental underpinnings of temperamental differences in 3- to 16-month-old twins and their parents. Found that additive genetic and shared environmental effects best represented smiling, laughter, and duration of orienting. Shared environmental effects fully accounted for co-twin similarity for soothability. Additive…

Assessed temperament of newborn twins using comprehensive neonatal exam that focused on irritability, resistance to soothing activity, and reinforcement value. Some infants were later assessed at 9 months. Emotional activity appeared to be core dimension stretching over ages and is discussed in relation to formulations of infant temperament.…

Personally important autobiographical memories are the smallest unit of the life story, which begins to emerge in adolescence. This study examined 2 features of self-defining memories in late adolescence, the meaning made of the memories to garner an understanding of the narrative construction of identity as a life story and how those memories…