Foreign-accented speech leads to the categorisation of the speaker as an outgroup individual in terms of cultural and social heritage. At the same time, foreign-accented speech deviates from the listener’s standard pronunciation and can be more challenging to understand. Based on the hypothesis that social categorisation and language processing influence cognition, this project will investigate how foreign-accented speech impacts performance in tasks involving thinking, judgment, and decision-making, compared to native-accented speech. To accomplish this, the project will leverage wellknown cognitive biases (e.g., causality bias, repetition-truth effect, endowment effect) and decision-making frameworks (e.g., ultimatum game) to explore how information delivered in foreign- or native-accented speech affects cognition.