Nikolic M, et al. - This study was performed to examine whether children at high risk for social anxiety disorder (SAD) (because of their parents’ SAD) displayed physiological hyperarousal while interacting with a stranger. Furthermore, the authors aimed to investigate whether early physiological hyperarousal was associated with later child social anxiety. The authors found an association between parents’ severity of SAD with child physiological hyperarousal early in their childhood. Moreover, physiological hyperarousal in early childhood predicted later child social anxiety. These findings implied that early physiological hyperarousal in social situations could pose a risk for later child social anxiety and that physiological hyperarousal, and electrodermal activity (EDA), in particular, could be a biological mechanism in the intergenerational transmission of SAD.