Conversational quality and visual interaction of video-telephony under synchronous and asynchronous transmission delay

In this study, the effect of pure synchronous and asynchronous transmission delay was examined in an interactive videotelephony setting. It was found that the conversational quality rated by participants of the study was clearly dependant on the tested conditions. This outcome can to some extend be ascribed to the used task which facilitated the usage of the visual channel for social interaction. Besides the conversational quality, a measure to quantify visual interaction was investigated for the first time in delayed mediated communication. The overall motion extracted from the recorded videos increased if synchronous transmission delays were inserted in the video-telephony connection.