Previous studies have examined either infant attachment or behavioral inhibition as risk factors for anxiety separately, but not both risk factors together. The study was done in collaboration with researchers at the National Institute of Mental Health and the University of Waterloo. It appears in Child Development, the journal of the Society for Research in Child Development.
Researchers studied 165 European-American, middle- to upper-middle-class adolescents (ages 14-17 years) who were recruited as infants (at 4 months). At 14 months, infants and their parents were observed in the lab to see how the babies responded to brief separations from their parents. Infants were classified as having a secure or insecure attachment to their parent based on this in-depth observation.
To test the second risk factor, children’s behavioral inhibition and social reticence was observed in the lab as they encountered new situations and new peers several times across early childhood (at 14, 24, 48, and 84 months). Parents also completed questionnaires about their children’s behavior in new situations and with unfamiliar peers. Based on the lab observations and results from parents’ questionnaires, the researchers classified children according to how inhibited or shy they were over time.
Years later (when the children were 14 to 17 years old), participants and their parents completed questionnaires about the adolescents’ anxiety. Youths who said that they often felt nervous going to parties, dances, or other places where there would be people they didn’t know well, and often felt nervous when they had to do something in front of an audience like read, speak, or play a game or sport, scored higher on social anxiety than youth who said they had such feelings less frequently.
The study concluded that children who were both insecurely attached to their parents as infants and who were inhibited throughout their childhoods went on to have higher levels of anxiety as adolescents, specifically social anxiety. Teen males who were insecurely attached to their parents as infants and who were inhibited across early childhood were at the most risk for social anxiety. In addition, the association between childhood inhibition and adolescent social anxiety was strongest for children who reacted angrily and weren’t able to calm down when reunited with their parents (during the lab task at 14 months), compared to children who showed other types of attachment patterns as infants.
"Our study suggests that it is the combination of both early risk factors that predicts anxiety in adolescence, particularly social anxiety," said Erin Lewis-Morrarty, postdoctoral research fellow at HDQM's Child Development Lab, who was involved with the study. "The findings can inform the prevention and treatment of adolescent social anxiety by identifying specific factors that increase risk for this outcome among children who are persistently shy."