Further evidence concerning the analysis of curvature in human foveal vision.
Data are presented which indicate that a length limit of 20 min arc applies to the highly accurate discrimination of curvature difference. Within this constraint and the previously reported orientational restriction (Watt and Andrews, 1982, Vision Res. 22, 449-460), curvature may determine the level of performance.
D005556:Form Perception / Q000502:physiology*; D005584:Fovea Centralis / Q000502:physiology*; D006801:Humans; D008266:Macula Lutea / Q000502:physiology*; D012399:Rotation; D012684:Sensory Thresholds / Q000502:physiology