Adolescents are often thought to be lonely because they distance themselves from their parents and are not fully integrated into the social world of their peers. Cacioppo's evolutionary model of loneliness, which has been applied primarily to adults, offers a complementary perspective. This model explains not only how feelings of loneliness emerge, but also how they are maintained. It also explains how loneliness can affect physiological functioning and health, and can spur changes in how people process information in the brain, as well as how genetic factors can affect loneliness. In this article, I use recent research to illustrate how the model sheds new light on loneliness in adolescence. I also suggest a comprehensive model of adolescent loneliness that combines key aspects of Cacioppo's evolutionary model with elements of other models.Loneliness refers to the negative emotions (e.g., feeling left out or abandoned) that emerge when people perceive their social relationships to be deficient. For several reasons, this emotional experience tends to be prevalent in adolescence. One reason is that loneliness is linked to the social reorientation process of adolescence (1, 2). During this process, parents tend to occupy a less central place in adolescents' lives while peers become more important. Particularly during early adolescence, when young people have distanced themselves psychologically from their parents and have not yet found their place in the social world of their age mates, some teenagers can feel very lonely. This view inspires most studies on adolescent loneliness, so they concentrate on how the social challenges of adolescence lead to loneliness.Although still a viable perspective, this view on loneliness can be complemented by other theories. One theory is Cacioppo's evolutionary model of loneliness (3). In this article, I describe the basic tenets of this model and illustrate, through recent research, how this model, which has been applied primarily to adults, sheds new light on loneliness in adolescence. In this research, loneliness is captured by well-established selfreport measures, such as the UCLA Loneliness Scale (4). In the final section of the article, I suggest a comprehensive model of adolescent loneliness that combines aspects of Cacioppo's evolutionary model with elements of other models. Both the studies I review and the comprehensive model I propose can also deepen our understanding of changes in adolescents' relationships with their parents and peers.
CACIOPPO'S EVOLUTIONARY MODEL OF LONELINESS AS APPLIED TO ADOLESCENCECacioppo's evolutionary model of loneliness is based on assumptions regarding the role that lonely feelings have played in our evolution. This model offers a coherent view of four aspects of loneliness. It explains how feelings of loneliness emerge and are maintained over time, how loneliness can affect physiological functioning and health, how loneliness changes how people process information in the brain, and how genetic factors can affect loneliness. When applied t...