Does infancy matter? Predicting social behavior from infant temperament

In this essay we argue that infant temperament, defined as behavioral style s that appear early in life as a direct result of neurobiological factors, plays a significant role in the development and expression of social behavi or. Temperament may be studied using a typological or dimensional approach and the relations between early temperament and later behavior can be exami ned in terms of homotypic or heterotypic continuity. The implication of eac h of these approaches for understanding the influence of infant temperament on social development is examined. As well, utilizing data from our labora tory, we suggest that under certain circumstances one can predict social be havior by identifying two temperament types in infancy. These types are hig h reactive/high negative infants and high reactive/high positive infants. A significant proportion of the high reactive/high negative infants display behavioral inhibition and social reticence through the preschool years, whe reas a significant proportion of the high reactive/high positive infants di splay exuberance and positive social interaction through the preschool peri od.