'No words'-Machine-learning classified nonverbal immediacy and its role in connecting teacher self-efficacy with perceived teaching and student interest.

Background: Much is known about the positive effects of teachers' self-efficacy on instruction and student outcomes, but the processes underlying these relations are unknown.

Aims: We aimed to examine the effects of teacher self-efficacy for student engagement (TSESE) before a lesson on teachers' nonverbal immediacy (NVI) and their enthusiastic teaching. Furthermore, we examined how NVI and enthusiastic teaching affected students' interest after the lesson, controlling for prior interest.

Exploring the impact of nonverbal social behavior on learning outcomes in instructional video design.

Online education has become increasingly popular in recent years, and video lectures have emerged as a common instructional format. While the importance of instructors' nonverbal social cues such as gaze, facial expression, and gestures for learning progress in face-to-face teaching is well-established, their impact on instructional videos is not fully understood. Most studies on nonverbal social cues in instructional videos focus on isolated cues rather than considering multimodal nonverbal behavior patterns and their effects on the learning progress.