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Effect of Robot Height on Comfortableness of Spoken Dialog

We investigated the effect of height of a robot on comfortableness of spoken dialog with the robot. We created a robot that could change the height continuously, and carried out dialog experiment with 18 subjects changing the robot's height. From the experimental result revealed the two observations: the "comfortable height" of a robot was lower than the eye height of a subject, and the comfortableness of dialog reduced when the height of the robot changed by 200 mm from the comfortable height.