How does background knowledge affect second language reading? An eye movement study

There is broad consensus that a reader's background knowledge on a reading topic affects both their reading processes and comprehension in their first language and also in a second language. However, it is unclear whether a reader's background knowledge specifically affects reading comprehension accuracy and reading rate. The extent to which background knowledge facilitates second language reading when compared to a reader's L2 linguistic knowledge is also unclear. Moreover, the mental process accounting for the interaction between general background knowledge, type of linguistic knowledge such as vocabulary or writing system, and L2 reading abilities also need to be identified. Using texts in Mandarin Chinese, this paper investigates these problems with an eye-movement study administered to 40 L2 Chinese learners with Indo-European L1s. Results illustrate that an L2 reader's background knowledge about the text can positively impact both their reading comprehension and reading rate; however, the influence on the latter could be topic-dependent. In more challenging topics, the contribution of background knowledge to reading comprehension could outweigh any single type of linguistic knowledge, even if the target language uses a more cognitively demanding writing system. The connectionist account proposed by the construction-integration theory is suggested to be currently the best theoretical explanation for the mental process behind developing second-language reading abilities. Pedagogical implications are also considered based on these findings.