Foreign language can either enhance decision-making by triggering more deliberation or worsen it due to cognitive overload. We tested these two hypotheses in one response bias: acquiescence. In three experiments, 413 participants made dichotomous decisions about whether 100 personality traits described them or not. Participants showed more acquiescence in a foreign language (vs. native), giving more certifying responses when deciding on known traits. Reaction time results suggest that a foreign language particularly impacts rejection more than certification of their comprehension. These findings support the cognitive overload hypothesis and provide valuable insights for the influence of language on response bias.
