This paper shows that L1 transfer may not be effectively maintained in the interlanguage due to confounding factors in the L2. When two factors, and , are correlated in the L2, second language learners may only acquire , even if is present in the L1. Transfer may not be effective because , being more robust in the input, conceals . Native speakers, on the other hand, generalize in spite of . The variables in question are weight-sensitivity () and positional bias () in English, both of which can predict the location of stress in the language. I show that two seemingly target-like groups of second language learners of English (speakers of Mandarin and speakers Portuguese) fail to accurately generalize weight-sensitivity in the language, and instead display response patterns which are predictable given the existing positional bias in English stress.
Keywords: transfer, stress, weight, positional bias, English, Mandarin, Portuguese, Bayes
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