D01-9 Novel hypothesis on softness perception: Low-frequency friction change to cause softness sensations
The principle by which humans judge the softness of an object when rubbing it may be different from that when pushing it. Based on our recent research findings, we hypothesize that the low-frequency fluctuation of friction generated when we rub the surface of an object with our fingers is the cause of the perception of softness during the rubbing action. Objective 1 of this study is to demonstrate the correctness of this hypothesis with strong evidence, which will be achieved through psychophysical experiments utilizing an electrostatic friction tactile display that controls friction on a flat panel. Objective 2 is to clarify how to apply the hypothesized principle to actual products and its effects. We will investigate the phenomenon that a plastic surface with a slight convex surface to change frictional resistance feels softer than a flat surface, and implement the optimal design of the surface. By exploring new hypotheses regarding the universal perception of softness, we will promote both understanding of texture and texture design.
