Does bilingualism actually improve executive brain functions?
Growing up bilingual does not provide a general boost to executive function skills like attention switching or mental control across the lifespan.
Source
Does language dominance affect cognitive performance in bilinguals? Lifespan evidence from preschoolers through older adults on card sorting, Simon, and metalinguistic tasks
Study at a glance
- Design
- Cross-sectional — Lifespan Welsh–English home-language groups on card sort, Simon, and metalinguistic tasks
- N
- N=650 · 650 on card sort; 557 Simon; 354 metalinguistic — largest task N reported
- Population
- Children and adults aged 3 to 60+ in Welsh–English language contexts
- Outcome
- Executive and metalinguistic performance by bilingualism and language dominance
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Does bilingualism actually improve executive brain functions?
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
650 participants in the card sort tasks
A total of 650 children and adults participated in the card sort tasks, 557 in the Simon tasks, and 354 in the metalinguistic task.
seven age groups of participants
Participants in seven age groups (from 3 years of age through over 60 years of age) were administered several executive function tasks, including the card sorting, Simon, and metalinguistic tasks to be reported here.
What they did
The researchers tested 650 participants on card sorting tasks, 557 on Simon tasks, and 354 on a metalinguistic task across seven age groups ranging from age 3 to over 60. Participants were categorized into four major home-language groups: English monolinguals, only Welsh at home, Welsh and English at home, or only English at home. The tasks measured their accuracy and reaction times when switching sorting rules, ignoring spatial placement cues, or judging grammatically correct but silly sentences.
What they found
Across the tasks, the researchers found almost no evidence of a cognitive advantage for bilinguals compared to monolinguals. On the Simon task, monolinguals were often faster or more accurate than bilinguals, except among older adults where bilinguals had slightly higher accuracy. On the metalinguistic task, performance was driven by language dominance rather than bilingualism, as those more dominant in a language performed best on its respective grammar test.
The limits
What it doesn't show
This study does not rule out the possibility that a bilingual advantage exists specifically for late-stage second language learners, as the participants here were simultaneous or very early sequential bilinguals who may process languages more automatically. Additionally, because the sample was drawn entirely from a highly supportive, bilingual region in North Wales, the results may not generalize to bilinguals in different sociological, cultural, or educational settings. Finally, the study's cross-sectional design means it cannot track individual cognitive trajectories over time.
Key terms
- executive function
- A set of cognitive processes including attentional control, working memory, and cognitive flexibility that allow people to plan and complete tasks.
- Simon effect
- The delay in reaction time that occurs when a visual stimulus is physically located on the side opposite to the button a participant must press to respond to it.
- metalinguistic judgment
- The ability to consciously reflect on and evaluate the structural and grammatical rules of a language independently of its meaning.
- simultaneous bilingual
- An individual who has been exposed to and acquired two languages at the same time from birth or early infancy.
- sequential bilingual
- An individual who learns one language first and then begins learning a second language later in childhood.
- inhibitory control
- The cognitive ability to suppress natural, habitual, or dominant behavioral responses in order to focus on a goal.
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Common questions
Why did previous studies find a bilingual advantage if this one didn't?
Many earlier studies did not properly control for socioeconomic background, cultural differences, or exact levels of language proficiency, which can artificially create differences in performance that are not caused by bilingualism itself.
What is the 'Gm' condition in the metalinguistic task?
The 'Gm' condition involves sentences that are grammatically correct but semantically anomalous, such as 'Why is the cat barking so loudly?', which requires participants to suppress the distracting, silly meaning to judge the grammar.
Does this mean learning two languages at a young age is not beneficial?
No, it simply suggests that early bilingualism may not provide a generalized boost to non-linguistic mental control, though it still offers massive linguistic, cultural, and social benefits.
What was the main difference between the child and adult Simon tasks?
The child version used cute pictures of a rabbit and pig with a touch screen, whereas the adult version used colored red and blue squares and required keyboard key presses.
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