Bound to be noticed? Opposing effects of boundedness on attention to morphemes in L2 reading

Introduction Salience—the extent to which a feature stands out from its environment-has been posited as an important cognitive factor in second language (L2) acquisition. However, supporting empirical research remains scarce, particularly looking at specific effects of salience properties in isolation. For example, although morphological boundedness of a form has been theorized to impact its salience, to date no study has considered morphological boundedness individually as an independent variable in relation to linguistic salience. Methods To address this gap, the present study uses an English-based semi-artificial target language in an implicit, reading-based learning task that allows boundedness to be manipulated in isolation from other factors. This design makes it possible to compare the effects of boundedness on attention, awareness, and early-stage acquisition (intake) of L2 morphological forms. We further considered how boundedness interacts with another salience property: morpheme length. Finally, we considered the relationship between salience effects and certain external factors that might impact attention and awareness: learning condition (incidental versus intentional), and three individual learner variables (L2 proficiency, working memory capacity, and implicit learning ability). Eye-tracking measured attention to and intake of target forms, and retrospective interviews measured awareness. Results Results showed greater skipping rates of bound versus unbound morphemes, but also greater fixation durations for bound morphemes. Longer forms were skipped less and fixated longer than short forms regardless of boundedness. Individual learner variables had no moderating effect on either salience variable, while the intentional learning condition yielded longer fixations on the short morpheme specifically than the incidental condition. Attention results only partially correlated with awareness, and no evidence of intake was found. Discussion While the attention results were as expected regarding length, the opposing results of attention measures regarding awareness show differences in effects of boundedness on initial versus prolonged attention. Overall, the results suggest that the relationship between salience, attention, awareness, and acquisition might be more complex than some theories posit.