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Late Finnish–English bilinguals were presented with neutral, positive, negative and taboo words in a modified Stroop paradigm in both Finnish and English. Significant interference from negative and taboo words compared to neutral words was found in both languages, whereas positive words were not found to differ significantly from neutral words. Furthermore, no differences in the size of the interference were present between languages. This suggests that, for late bilinguals with good knowledge of their second language, the first (L1) and second (L2) language are equally capable of activating the emotional response to word stimuli representing threat, and thus interfering with the cognitive processes involved in responding to colour. This effect was equivalent for negative and taboo words.
Eilola et al. (Thu,) studied this question.