Differential susceptibility to peer rejection and acceptance: A within-child experiment.

The differential susceptibility model suggests that the same children who are more susceptible to peer rejection are also more susceptible to peer acceptance. Testing this within-child assumption, we examined whether a subgroup of children exists who are more reactive to both rejection and acceptance, and whether higher levels of sensory processing sensitivity (SPS) characterize this subgroup. We randomly assigned 455 preadolescents (Mage = 10.86, 49.5% boys) to receive either counterbalanced rejection and acceptance feedback (experimental group) or neutral feedback (control group) from online fictitious peers, and assessed their emotional, self-esteem, attributional, and behavioral responses. Results revealed two subgroups of children showing elevated emotional or self-esteem reactivity to both rejection and acceptance, supporting within-child differential susceptibility. However, SPS did not distinguish these subgroups or moderate children's responses to peer feedback - suggesting limited support for SPS as a differential susceptibility marker to experimentally manipulated peer acceptance and rejection.