“…The native speaker group exceeded 90% accuracy and were three times faster in responding to sentences than the learners, who performed at near chance, or even below, in detecting errors in the ungrammatical items. The large difference between the performance of native speakers and learners, including those who have had early immersive exposure, has been documented in previous work, as well (Bergström et al, 2016;Kersten, 2010), and poor sensitivity to nonnative morpho-syntactic errors in online sentence processing has also been reported (Chen et al, 2007;Jiang, 2004Jiang, , 2007Jiang et al, 2011;VanPatten et al, 2012). Considering the profiles of participants in the present study, the results illustrate how even for learners with very high global L2 proficiency and even for those who have had additional early immersive exposure, it is difficult to attain high sensitivity to L2 morpho-syntactic features in online processing.…”