Illusory movement of dotted lines.
When oblique rows of black and white dots drifted horizontally across a mid-grey surround, the perceived direction of motion was shifted to be almost parallel to the dotted lines and was often nearly orthogonal to the real motion. The reason is that the black/white contrast signals between adjacent dots along the length of the line are stronger than black/grey or white/grey contrast signals across the line, and the motion is computed as a vector sum of local contrast-weighted motion signals.
Ito
Hiroyuki
H
Department of Visual Communication Design, Kyushu University, 4-9-1, Shiobaru, Minami-ku, Fukuoka-shi, 815-8540, Japan. ito@design.kyushu-u.ac.jp
Anstis
Stuart
S
Cavanagh
Patrick
P
D015350:Contrast Sensitivity; D006801:Humans; D009039:Motion Perception / Q000502:physiology*; D009903:Optical Illusions / Q000502:physiology*