Does Bilingual Code-Switching Enhance Executive Function in Children? A Focused Review of When and under What Conditions Cognitive Benefits Emerge

Research on the bilingual executive-function advantage has produced positive, null, and inverse findings. One likely reason is that bilingualism is often treated as a uniform category, even though children differ substantially in how they use their languages. This focused critical review examines whether code-switching, rather than bilingual status alone, is associated with cognitive flexibility and inhibitory control in children and identifies the conditions under which benefits are most plausible. Eleven peer-reviewed sources were selected from the project's literature corpus to provide theoretical foundations, broad child-level syntheses, methodological critiques, and direct evidence. The evidence does not support a universal code-switching advantage. Direct child studies report a conditional positive association, a null association, and an inverse association; another study shows that the relation between language control and cognitive control may also operate in the opposite direction. Across this literature, language ability, interactional context, switching type, task choice, and age emerge as candidate boundary conditions. The most defensible conclusion is therefore not that code-switching generally improves executive function, but that specific forms of regulated switching may be associated with specific executive processes in particular children. Longitudinal, ecologically valid, and better harmonized studies are required before causal or educational claims can be made.