Corrective feedback (CF) is a common technique for helping learners recognize errors in their second language (L2) production. It has also been the subject of much research over the past 30 years and has been approached from a wide variety of theoretical angles. One of these is the Interactionist approach, which posits that CF has the potential to draw learners’ attention to problems in their L2 production, provide opportunities for modified output (i.e., to self-correct), and to hear models of targetlike input (Gass, 2003; Long, 1996).

More specifically, interactionist researchers believe that when learners receive CF during meaningful, communicative tasks or conversations, their attention can be brought to ‘mismatches’ between their own forms and the targetlike forms. This in turn may facilitate form-meaning mappings to a greater degree than if the CF was provided during a decontextualized grammar drill. The CF can be provided by the teacher or a peer and can take many forms, including recasts (reformulating a learner utterance in a more targetlike manner), prompts (discourse moves that encourage learners to self-correct), and metalinguistic explanations (detailed information on the nature of the learner error), among others. These discourse moves can provide negative evidence, or information about what is not possible in the target language. This is believed to be useful if not necessary for the development of fluency and accuracy in the L2.

Interactionist researchers have sought to identify an optimal type of CF given a set of learner characteristics (e.g., aptitude, working memory capacity, anxiety levels), contextual variables (e.g., the pedagogic orientation of the classroom), and linguistic target features (and in particular, the difficulty of the target) (Ellis & Shintani, 2013). Highlighting the interpersonal nature of CF, interactionist researchers have also investigated the characteristics of the interlocutors involved, including age (see Oliver & Azkarai, 2017 for a review), the relative proficiency of the interlocutors (e.g., native speaker, foreign language learner, heritage language learner; e.g., Mackey et al., 2003), and interpersonal dynamics (such as the learner’s perceived competence of the interlocutor and the degree of cooperation between the two (Sato & Ballinger, 2016).

A number of avenues for future research have been identified in the literature. These include more research on linguistic targets beyond morphosyntax; investigating a wider variety of L2 learners, including less literate learners and those in non-instructional contexts (Tarone, 2010); examining the amount of CF that needs to be provided to best facilitate acquisition (Li, 2018); investigating the long-term effect of CF; and researching the extent to which interpersonal dynamics intersect with cognitive factors and feedback characteristics.