Sympathetic and Parasympathetic Nervous System Functioning and Experiences of Peer Exclusion: Links to Internalizing Problems in Early Adolescence.

This study examines the moderating effect of both branches of the autonomic nervous system (sympathetic and parasympathetic) on associations between peer exclusion and internalizing behaviors. Young adolescents (N = 68) self-reported their perceptions of peer exclusion and internalizing problems and participated in stress-inducing public speaking tasks. Skin conductance and respiratory sinus arrhythmia were assessed at baseline (skin conductance baseline, SCLB; respiratory sinus arrhythmia baseline, RSAB) and during the challenge task to provide measures of physiological reactivity (skin conductance reactivity, SCLR; respiratory sinus arrhythmia reactivity, delta RSA). Youth with high delta RSA (low vagal suppression) had higher levels of internalizing problems when they perceived more peer exclusion in their social environments. The combination of low SCLR and high delta RSA (reciprocal parasympathetic) predicted higher levels of internalizing problems, whereas the combination of high SCLR and high delta RSA (coactivation) predicted lower levels of internalizing problems. The association between peer exclusion and youth internalizing problems was not moderated by ANS reactivity profiles which reflected combinations of SCLR and delta RSA.