“…Several item-related and learner-related factors have been linked to the acquisition, processing, and use of FS. Item-related factors include, for example, L1-L2 congruency (Boone et al, 2023;Ding & Reynolds, 2019;Vu & Peters, 2022;Wolter & Gyllstad, 2013) and corpus frequency (Durrant, 2014;Ellis, 2002). Learner-related factors or individual differences (IDs) include factors -often interrelated -such as age of onset (Foster et al, 2014), memory-based language aptitude (Bolibaugh & Foster, 2013;Ellis & Sinclair, 1996), motivation (Arvidsson, 2021;Dörnyei et al, 2004), exposure (Bolibaugh & Foster, 2013;Foster et al, 2014), social interaction (Boone, 2021;Dörnyei et al, 2004), and self-efficacy and self-regulation (Arvidsson, 2021).…”