Abstract
An internet service of video sharing using pseudo synchronization attracts the attention. As a typical example, there is Nico Nico Douga (Nico Video) that comments, which were submitted to a scene in a video by the Nico Video users, are superimposed to the same scene in the video played back by a viewer. The viewer watching the video with the superimposed comments feels as if the viewer shares emotion in the scene with the users even though the viewer watches the video alone. This paper describes an influence of the user's comments to the viewer's emotion and shows that the video sharing using pseudo synchronization causes the upsurge of sentiment of the viewer in a certain kind of emotion. First, five videos are selected that cause emotions “Joy”, “Anger”, “Sadness” and “Relaxation” of Russel's model. Next, the videos are submitted to Nico Video and comments superimposed by Nico Video users are collected and analyzed, then typical comments expressing the emotions are selected. Furthermore, new videos superimposing the typical comments are produced and an experiment is conducted to measure emotion strength while the viewer is watching the new videos and the original (no comments) videos. Finally, relation between the existence of comments and feeling upsurge of viewer are discussed and the experimental results are verified based on the psychology on emotions.
