Users´ reactions toward an on-screen agent appearing on different media

We experimentally investigated users´ reactions toward an on-screen agent appearing on three different types of media: a 42-inch television, 17-inch display, and 4.5-inch mobile PC. Specifically, we observed whether the users accepted the agent´s invitation to a Shiritori game while they were engaged in given tasks. The results showed that most participants who received the invitation from the on-screen agent appearing on a 4.5-inch mobile PC accepted the agent´s invitation, while most participants did not accept the invitation from the agent appearing on the other two formats. Therefore, the mobile PC appears to be an appropriate media for an on-screen agent that is required for interaction with users.