Heading judgement from second-order motion.
We examined human heading judgement from second-order motion which was generated by random-dots with the contrast polarity determined randomly on each frame. It was found that human observers can judge heading fairly accurately from second-order motion when pure translation is simulated or when self-motion toward a ground plane with gaze rotation is simulated but they cannot when self-motion toward cloud-like random dots with gaze rotations is simulated. It is suggested that the human visual system cannot decompose the flow fields into rotational and translational components by using second-order motion information alone, but it can do in some ways from the flow field of the ground plane.
Hanada
M
M
Graduate School of Human and Environmental Studies, Kyoto University, Yoshida-nihonmatsu-cho, Sakyo-ku, 606-8501, Kyoto, Japan. hanada@bun.1.chiba-u.ac.jp
Ejima
Y
Y
D015350:Contrast Sensitivity / Q000502:physiology*; D006801:Humans; D009039:Motion Perception / Q000502:physiology*; D009949:Orientation / Q000502:physiology*; D011601:Psychophysics; D011698:Pursuit, Smooth / Q000502:physiology; D012044:Regression Analysis