Why do bilinguals code-switch when emotional? Insights from immigrant parent–child interactions.

: Previous research has found that bilingual speakers' first (L1) and second languages (L2) are differentially associated with their emotional experiences. Moreover, bilinguals appear to code-switch (alternate between two or more languages in a single conversation) during emotional episodes. However, prior evidence has been limited to clinical case studies and self-report studies, leaving open the specificity of the link between code-switching (CS) and emotion and its underlying mechanisms. The present study examined the dynamic associations between CS and facial emotion behavior in a sample of 68 Chinese American parents and children during a dyadic emotion-inducing puzzle box task. Specifically, bilingual parents' language use (L1 Chinese or L2 English), CS behavior (L1→L2 or L2→L1 switches), and facial emotion behavior (positive and negative valence) were coded at each 5-s interval. Multilevel modeling was used to analyze whether facial emotion behavior predicted later CS and vice versa. We found that negative facial emotion predicted higher subsequent CS in both L1→L2 and L2→L1 directions, with stronger associations for the L2→L1 direction. On the other hand, positive facial emotion was associated with lower contemporaneous L2→L1 CS. CS did not predict later facial emotion behavior, suggesting language switching may not have an immediate effect on emotion. The present findings are consistent with the idea that emotional arousal, especially negative arousal, reduces cognitive control and may trigger spontaneous CS. Together, these findings provide insight into why bilingual speakers switch languages during emotional episodes and hold implications for clinical interventions serving bilingual individuals and families. (PsycINFO Database Record (c) 2019 APA, all rights reserved).