title: The Okuma illusion: a new illusion of leaning.
abstract: A new illusion demonstrating the perception of tilted objects is reported. Physically, all the objects in a rotated image should tilt at the same degree. We, however, found that the tilt of objects in a rotated frame is perceived differently. We tested several objects and found that this phenomenon is especially noticeable when an element in the image has a non-geometric shape. A possible mechanism for this illusion is proposed.
authors.affiliation: Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Sinjuku-ku/Tokyo 169-8555, Japan. t-yasuda@asagi.waseda.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Yasuda
authors.forename: Takashi
authors.initials: T
authors.lastname: Ueda
authors.forename: Kenpei
authors.initials: K
authors.lastname: Shiina
mesh_terms: D001288:Attention; D003867:Depth Perception; D004192:Discrimination, Psychological; D006801:Humans; D009903:Optical Illusions; D009949:Orientation; D010364:Pattern Recognition, Visual