This paper presents an experimental study of how video lecture styles with lecturer or not and video
length segmenting affect learning performance and attitudes. In this work, we examine the effects of
video presentation styles in supporting the teaching of Korea geography in the secondary education. We
recorded two distinct styles of video lectures: 1) video capture of class teaching (Lecture style), and 2)
close-up video capture of an interactive drawing board with voice-over (Khan Style). And then we
segmented the videos into smaller chunks of information (3-min, 6-min, 18-min) to facilitate students’
learning. Six groups of students attended six distinct styles of video lectures and received the respective
six treatments : 1) 3-min Lecture style, 2) 6-min Lecture style, 3) 18-min, 4) 3-min Khan style, 5)
6-min Khan style, and 6) 18-min Khan style. We found that Lecture style videos were more effective
than Khan Style videos, 3-min segmentation video was more effective than other segmented ones, and
Khan Style 3-min segmentation video was most effective among them. The findings encourage segmenting
instructional videos into small chunks to help students learn from dynamic visualizations. Based upon
these findings we hope to help instructors and video producers take better.