To elucidate effects of vision, visual bias, on tactile roughness of wood surfaces, 12 kinds of fancy veneer (Quercus alba) overlaid plywood were prepared. Forty subjects rubbed the surfaces and evaluated their roughness subjectively without vision (unimodal condition), and another 35 subjects robbed and evaluated with vision (multimodal condition). Evaluation scores concerning the tactile roughness of both conditions were compared. The tactile roughness in the multimodal condition was affected by the vision. Especially, edge grain specimens with film-forming finish by acrylic urethane paint were evaluated as rougher surfaces than evaluated in the unimodal condition, when the surfaces were robbed perpendicular to the grain. This result suggests that the visual bias exactly affected the tactile roughness of the coated surfaces.
