Ryoko Tokuhisa

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About

Ryoko Tokuhisa is a leading researcher in human-robot interaction, with a primary focus on developing conversational agents that provide empathetic, active listening to support elderly well-being. Her most influential work, the "Active Listening System for a Conversation Robot" (2017), tackles the critical challenge of reducing dementia and loneliness in older adults through dialogue. Tokuhisa’s key contribution is a speech dialogue system that, despite imperfect speech recognition, generates appropriate responses—such as backchanneling, repeating user utterances, and asking for missing predicates—while also producing empathetic replies based on emotion estimation. This robustness to recognition errors is a standout feature, enabling natural, sustained conversation. In a large-scale evaluation with 110 participants, her system achieved a 45.5% success rate in maintaining dialogue for over two minutes on the topic of "impressionable travel," demonstrating its practical viability. With 15 citations, this work lays a foundational framework for socially assistive robots that go beyond task completion to offer genuine companionship, marking Tokuhisa as a pioneer in designing emotionally intelligent, resilient dialogue systems for vulnerable populations.