Cues facilitate foreign language vocabulary learning from instructional videos: Behavioral and neural evidence

Vocabulary learning is basic for mastering a foreign language. Many students learn foreign language (FL) vocabulary via instructional videos outside of traditional classrooms, as there is no limit to time or space. Cues (e.g. coloring, highlighting, arrows, and text) are design features in instructional videos that not only guide learners' attention, but also facilitate the organization and integration of information. However, little is known about how visual cues and text cues influence FL vocabulary learning from instructional videos. In Experiment 1, we tested the effects of synonym text cues presented before the instructional video and visual cues during the video. Effects were measured in terms of participants' judgments of learning and objective measures of learning performance (indicated by accuracy on immediate and delayed tests). Learners showed highest accuracy in the text cues condition, followed by the visual cues condition, and finally the no cues condition. In Experiment 2, we tested the neural oscillatory correlates of cues in FL vocabulary instructional videos based on electroencephalogram (EEG) evidence of frontal theta and frontal-parietal alpha power. Compared to visual cues during the video, text cues before the video elicited higher frontal theta power, suggesting higher working memory processing, at the early stage of learning from instructional videos. The results of this study have implications for designing effective FL vocabulary instructional videos with cues.