Predictions about the Cognitive Consequences of Language Switching on Executive Functioning Inspired by the Adaptive...

Area of Science:

• Cognitive Neuroscience
• Psycholinguistics
• Bilingualism Research

Background:

• The adaptive control hypothesis is a leading theory of bilingual language control.
• It posits that interactional context influences executive functions.
• Predictions include enhanced domain-general executive functions in dual-language contexts.

Purpose of the Study:

• To review and evaluate empirical evidence testing predictions derived from the adaptive control hypothesis.
• To assess the alignment between behavioral and neuroscience findings regarding bilingualism and executive functions.
• To re-examine the hypothesis using new analyses of large-sample studies.

Main Methods:

• Review of recent behavioral studies on executive functions in bilinguals.
• Evaluation of fMRI and ERP studies on neuroanatomical adaptations.
• New analyses of two large-sample studies categorizing bilinguals by language context.

Main Results:

• Inconsistent evidence for enhanced executive functions in dual-language contexts; some studies showed smaller switch costs, but no consistent advantages for inhibitory control.
• Neuroscience evidence (fMRI, ERP) for the hypothesis was found to be inconsistent.
• New analyses across nine executive functioning measures revealed no predicted advantage for dual-language contexts.

Conclusions:

• The adaptive control hypothesis's predictions do not accurately reflect behavioral performance on executive functioning tests.
• The hypothesis does not adequately explain how specific dimensions of bilingualism might enhance executive functions.
• Current evidence does not support the adaptive control hypothesis's core predictions regarding interactional context and executive functions.