Thinking in a Second Language Changes Moral Choices, but Only When the Mind Has Room to Deliberate

Imagine being asked whether it is acceptable to push one person off a bridge to save five others. Now imagine being asked the same question in a language you learned at school rather than the one you grew up speaking. For more than a decade, psychologists have reported a curious pattern: people tend to make more utilitarian choices, endorsing actions that maximize overall outcomes even when those actions feel emotionally disturbing, when they deliberate in a foreign tongue. The phenomenon, known as the foreign language effect, has been replicated across dozens of studies and dozens of language pairs, yet its underlying mechanism has remained stubbornly contested. Does a second language make us colder calculators, or does it simply mute the emotional alarm bells that make us flinch at harmful actions?

A new study published in Current Psychology by Liu Ting of Neusoft Institute Guangdong and Yuan Xiaolin of Hainan Normal University offers one of the sharpest answers yet, and the answer is that the effect is not one thing at all. By combining a classic experimental manipulation of mental effort with a formal modeling framework that disentangles different strands of moral decision-making, the researchers show that the foreign language effect wears two very different faces depending on how much cognitive resources the mind has available. When thinking capacity is plentiful, a foreign language appears to sharpen sensitivity to consequences. When that capacity is taxed, only the emotional side of the effect survives.

The methodological heart of the study is the CNI model, a multinomial processing tree model developed by Bertram Gawronski and colleagues that has rapidly become the gold standard for decomposing moral dilemma responses. Traditional trolley-style experiments yield a single binary choice per dilemma, which makes it impossible to tell whether someone endorsed a harmful action because they weighed outcomes heavily, because they discounted moral norms, or because they simply have a general disposition to act rather than remain passive. The CNI model solves this by presenting participants with dilemmas that systematically vary the consequences of action and inaction and the norms involved, then estimating three separate parameters: C, which captures sensitivity to consequences; N, which captures sensitivity to norms; and I, which captures a general preference for action over inaction, independent of any specific dilemma content.

This decomposition matters because the two leading theories of the foreign language effect make different predictions about which parameters should shift. The enhanced deliberation account, rooted in dual-process theories of moral judgment, holds that a foreign language consumes processing resources and slows down intuitive responses, giving deliberate, outcome-based reasoning more influence. On this view, foreign language should raise the C parameter. The diminished emotionality account, by contrast, holds that emotionally charged words learned in childhood carry stronger visceral resonance than their later-acquired translations, so a foreign language blunts the aversive feelings that normally inhibit harmful actions. On this view, foreign language should lower the I parameter, reducing the general inhibition against acting. Until now, most studies could not separate these possibilities.

The researchers recruited 120 native Chinese-speaking university students and randomly assigned them to complete a set of moral dilemmas either in Chinese, their first language, or in English, their foreign language. Crucially, they crossed language with a second manipulation: cognitive load. Half of the participants in each language condition performed the task under high cognitive load, holding a demanding memory load in mind while judging the dilemmas, while the other half worked under low load with their cognitive resources largely free. This two-by-two design allowed the team to ask a question no prior study had answered directly: what happens to the foreign language effect when the mind’s deliberative machinery is deliberately occupied elsewhere?

The results were strikingly patterned. Under low cognitive load, participants responding in English showed a significantly higher C parameter than those responding in Chinese, meaning they weighted the consequences of their choices more heavily, and a significantly lower I parameter, meaning their general reluctance to take action was reduced. In other words, when cognitive resources were abundant, the foreign language effect manifested as both enhanced outcome calculation and weakened action inhibition, exactly the signature predicted by a combination of the deliberation and emotionality accounts. The N parameter, sensitivity to norms, did not differ between languages, suggesting that the effect does not operate by loosening adherence to moral rules per se.

Under high cognitive load, however, the picture changed dramatically. The elevated C parameter disappeared entirely; the English and Chinese groups no longer differed in their sensitivity to consequences or in their sensitivity to norms. The only remaining difference was in the I parameter, which remained lower for the English group. When the deliberative pathway was blocked by an unrelated mental burden, the foreign language effect did not vanish. It shrank to its emotional core: a reduced general inhibition against action. This dissociation is the study’s central contribution, and it supports what the authors describe as the dominance of the emotional pathway when cognitive resources are depleted.

The findings carry important theoretical implications. They suggest that the foreign language effect is not a unitary phenomenon driven by a single mechanism, as much of the earlier literature implicitly assumed. Instead, it is a composite, with a deliberative component that requires available cognitive resources and an emotional component that persists even when those resources are exhausted. This may help explain why meta-analyses of the effect, including work by Stankovic and colleagues published in Brain and Language, have found considerable heterogeneity across studies: different experiments, with different time pressures, working memory demands, and participant populations, may be capturing different proportions of the two components. It also resonates with classic findings from Joshua Greene’s lab showing that cognitive load selectively interferes with utilitarian moral judgment, here refracted through the lens of language.

There are practical echoes as well. The foreign language effect has been documented in domains far beyond the trolley problem, including bribery susceptibility in workplace vignettes, medical decision-making, and everyday ethical choices. If the effect partly reflects reduced emotional inhibition, then people making consequential decisions in a second language, whether international negotiators, multilingual clinicians, or migrants navigating unfamiliar bureaucratic systems, may be less held back by the visceral discomfort that normally guards against harmful actions. At the same time, the finding that the deliberative component evaporates under load is a caution: the cool, outcome-sensitive reasoning that a foreign language can sometimes promote is fragile, easily crowded out by any competing mental demand, from stress to distraction to fatigue.

The study is not without limitations, some of which the authors acknowledge. The sample consisted of 120 Chinese university students judging dilemmas in Chinese and English, and the strength of the foreign language effect is known to depend on proficiency, age of acquisition, and the emotional proximity between languages, so the specific parameter profile may differ for other bilingual populations. The raw trial-level data from the underlying master’s thesis, completed in 2022, are no longer fully accessible, though summary statistics, parameter estimates, and model fit indices are reported in the manuscript and aggregated frequency tables are available as supplementary material. Still, by moving beyond the simple utilitarian-versus-deontological score and adopting a model that separates consequences, norms, and action tendencies, the study offers a template for how the field can finally untangle the psychology of why we seem to become, in some sense, slightly different moral agents when we switch languages. The mind, it turns out, does not simply become more rational in a foreign tongue. It becomes freer, and only sometimes more calculating, depending on how much room it has left to think.

Subject of Research: The role of cognitive load in the foreign language effect on moral decision-making, analyzed with the CNI model

Article Title: The influence of cognitive load on the foreign language effect in moral judgment: an analysis based on the CNI model

Article References: Ting, L., & Xiaolin, Y. (2026). The influence of cognitive load on the foreign language effect in moral judgment: an analysis based on the CNI model. Current Psychology, 45(18), Article 1528. https://doi.org/10.1007/s12144-026-10091-y

Image Credits: AI Generated

DOI: 10.1007/s12144-026-10091-y

Keywords: foreign language effect, moral judgment, CNI model, cognitive load, bilingualism, moral psychology, dual-process theory, utilitarian judgment, psycholinguistics, moral dilemmas, decision-making, Current Psychology