Video helps NNS pairs to work together more effectively. These pairs produce higher quality work, spend less time, and have fewer miscommunications that result in errors. Video potentially allows them to monitor their common ground more effectively by allowing them to communicate non-verbally and identify misunderstandings more quickly. In contrast, video does not seem to benefit the native speakers. These results have important implications for people in multinational companies, who rely on remotely located teams distributed across language boundaries.
Video is a benefit for their communication quality.
Lawrence Erlbaum Associates. Interactive human communication. Evaluation of alternative media used with a groupware editor in a simulated telecommunication environment. What mix of video and audio is useful for remote real-time work. In Proceedings of CHI, 362-368.