We have been developing mental commit robots that provide psychological, physiological, and social effects to human beings through physical interaction. The appearances of these robots look like real animals such as cat and seal. We have been applied mental commit robots to assisting activity of elderly people at a day service center. In order to investigate the effect of mental commit robots to the elderly people, we evaluated elderly people's mood by face scales (which express person's moods by illustration of person's faces) and questionnaires. In addition, stress of nursing staff was investigated. We evaluated their mental poverty by "Burnout Scale." Mental commit robots were provided into the day service center for five weeks. As the results, feelings of elderly people were improved by interaction with the robots. Moreover, the nursing staff's mental poverty decreased because the elderly people spent their time by themselves with the robots. Consequently, mental commit robots were useful at elderly institutions like the day service center.
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