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It is known that a pseudo force sense as if pulled in one direction is generated by presenting an asymmetrical vibration stimulus with different acceleration in round trip. In this research, we utilized similar phenomenon using asymmetric rotational vibration of DC motor to present pseudo force sensation to multiple fingertips. In this paper, we investigated frequency characteristics of this phenomenon with two fingers; thumb and index finger, with grasping posture, showing that around 30Hz vibration is optimal. We also conducted an experiment to see equivalent physical force that this illusion generates, and it showed 10 to 30 gram force, with large variance among participants.

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