Study for the role of ambiguous emotional expression in communication with a robot

交际是人类社会能力的基础。它是多个实体之间的信息交换，在此范围内，模糊性被认为是沟通所不必要的。本研究提出了一个假设，即人际交往中存在模糊性，并且它不仅在一对一关系中，而且在大规模社会群体中发挥着关键作用。为了验证这一假设，我们进行了模拟研究和机器人的行为实验。为了完成这项研究，我们开发了一个行为实验系统与通信机器人。通过这个实验系统，我们可以发现歧义在人际交往中的作用。例如，我们发现，模糊的面部表情增强了人际交流的顺畅性。此外，我们还表明，延迟的参与者的目光后，面对机器人的方向变化强烈反映了参与者的认可机器人。

Communication is a basis of social ability in human. It is an exchange of information among multiple entities, and within this, ambiguity has been thought to be unnecessary for communication. This study proposed a hypothesis that ambiguity is included in interpersonal communication and that it plays a criticalrole, not only in one-to-one relationshipbut also in a large scale social group. In order to test this hypothesis, we conducted simulation studies and behavioral experiments with a robot. For the achievement of this study, we developed a behavioral experiment system with a communication robot. With this experimental system, we could show severalfindings about the role of ambiguity in an interpersonal communication. For example we showed that ambiguous facial expressionenhances smoothness of an interpersonal communication. Further, we also showed that latency of participant's gaze following to face direction change of a robot strongly reflect a participant's recognition to the robot.