Cognitive reappraisal and expressive suppression relate differentially to longitudinal structural brain development across adolescence.

Emotional disorders commonly emerge in adolescence, a period characterized by changes in emotion-related processes. Thus, the ability to regulate emotions is crucial for well-being and adaptive social functioning during this period. Concurrently, the brain undergoes large structural and functional changes. We investigated relations between tendencies to use two emotion regulation strategies, cognitive reappraisal and expressive suppression, and structural development of the cerebral cortex and subcortical structures (specifically amygdala and nucleus accumbens given these structures are frequently associated with emotion regulation). A total of 112 participants (59 females) aged 8-26 were followed for up to 3 times over a 7-year period, providing 272 observations. Participants completed the Emotion Regulation Questionnaire (ERQ), yielding a measure of tendencies to use cognitive reappraisal and expressive suppression at the final time point. Linear mixed model analyses were performed to account for the longitudinal nature of the data. Contrary to expectations, volumetric growth of the amygdala and nucleus accumbens was not associated with either emotion regulation strategy. However, frequent use of expressive suppression was linked to greater regionally-specific apparent cortical thinning in both sexes, while tendency to use cognitive reappraisal was associated with greater regionally-specific apparent thinning in females and less thinning in males. Although cognitive reappraisal is traditionally associated with cognitive control regions of the brain, our results suggest it is also associated with regions involved in social cognition and semantics. The continued changes in cortical morphology and their associations with habitual use of different emotion regulation strategies indicate continued plasticity during this period, and represent an opportunity for interventions targeting emotion regulation for adolescents at risk.