Cognitive gains in 7-month-old bilingual infants

Kovács, Ágnes Melinda; Mehler, Jacques · 2009 · OpenAlex-citations

DOI: 10.1073/pnas.0811323106

archive: archived pipeline: cataloged verified

Get this paper ↗ (DOI — opens at the source; we link to it, we don't host it)

Summary

This study investigates whether early exposure to two languages enhances executive functions (EF) in preverbal infants, specifically addressing how bilingual infants manage inconsistent linguistic input before speech onset. While previous research established that bilingualism improves cognitive control in older children and adults, it remained unclear if these benefits emerge prior to language production. The authors hypothesized that the continuous processing of two languages requires monitoring and control mechanisms, thereby accelerating the development of domain-general EF in infants. To test this, the researchers conducted three eye-tracking experiments with 7-month-old “crib bilinguals” (exposed to two languages from birth) and matched monolinguals. In each experiment, infants learned to anticipate a visual reward based on a cue. The task consisted of a preswitch phase, where the cue consistently predicted a reward on one side, and a postswitch phase, where the cue’s validity reversed to the opposite side. Learning the initial association required basic associative learning, whereas adapting to the switch required inhibiting the previously learned response, a process dependent on EF. Experiment 1 used speech cues with different nonsense words for each phase. Experiment 2 used speech cues with distinct phonological structures (AAB vs. ABB) to signal the switch. Experiment 3 used visual cues (geometric figures) to determine if the effect was modality-specific. The results demonstrated that both monolingual and bilingual infants successfully learned the initial association in the preswitch phase across all three experiments. However, a significant divergence occurred in the postswitch phase. Only bilingual infants successfully redirected their anticipatory looks to the new reward location and suppressed perseverative looks to the original location. Monolingual infants failed to learn the new response, continuing to look at the previously valid side despite the change. This advantage persisted regardless of whether the cues were auditory or visual, indicating that the enhancement was not limited to the modality of language acquisition. These findings provide evidence that early bilingual exposure leads to a domain-general enhancement of executive control mechanisms well before the onset of speech. The study suggests that the cognitive demands of processing and maintaining separate representations for two languages serve as a form of practice for inhibitory control and cognitive flexibility. This challenges the notion that bilingual advantages only appear after language production begins and highlights the potential for early linguistic environments to shape fundamental cognitive development. The results imply that crib bilingualism promotes precocious cognitive benefits, offering insights into neural plasticity and the developmental trajectory of executive functions.

Provenance

The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed.

Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.

Topics

Ranked by relevance to this paper. Hover a topic for its definition.

• executive function