We have proposed a tactile geometry display technique based on active finger movement. The technique uses a perceptual feature\r\nthat, during finger movement, the length of a touched object is perceived to increase when the object is moved in the same direction\r\nas the finger movement or to decrease when it is moved in the opposite direction. With this display technique, a wide range of\r\ntactile shapes can be presented with realistic rigid edges and continuous surfaces. In this work, to further develop our technique,\r\nwe performed psychophysical experiments to study perceptions of length and roughness under this presentation technique. The\r\nresults indicated that the elongation (shrinkage) of the object can be observed regardless of the roughness of the touched object\r\nand that the perceived roughness of the object slightly changes but the changes are much smaller than those theoretically expected.
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