Effect Analysis of Playback Speed for Lecture Video Including Instructor Images

Abstract

The goal of this study is to clarify the effects of playback speed for lecture videos whose layouts consisted of slides together with instructor images. In our experiments, a lecture video that included images of instructors’ faces was presented at speeds of 1×, 1.5×, and 2× to 59 university students. The results of comprehension tests and a questionnaire survey suggest the possibility that viewing videos at 1.5× speed is more effective for learning than viewing at normal speed. The results of eye-tracking tests to track the focus of 18 university students indicated that the majority of the students spend roughly 10% of the total duration of a lecture video with their eyes focused on instructor images regardless of video speed.