title: Three-dimensional shape from second-order orientation flows.
abstract: In images of textured surfaces, orientation flows formed by perspective convergence invariably convey 3D shape. We show that orientation flows formed by contrast-modulated (CM) and illusory contours (IC) convey 3D shape, and that both stimulus types induce 3D shape aftereffects on CM and IC test stimuli. Adaptation to luminance-modulated (LM) orientation flows induce robust 3D shape aftereffects on CM and IC tests, however, aftereffects using CM/IC adapting stimuli on LM tests were substantially weaker. These results can be explained by the adaptation of 3D shape-selective neurons that invariantly extract first- and second-order orientation flows from striate and extra-striate signals, which receive stronger input from neurons selective for first-order orientation flows.
authors.affiliation: Neuropsychology Doctoral Subprogram, CUNY Graduate Center, 365 Fifth Ave, NY 10016, USA.
authors.forename: Carole
authors.initials: C
authors.lastname: Filangieri
authors.forename: Andrea
authors.initials: A
authors.lastname: Li
mesh_terms: D000222:Adaptation, Physiological / Q000502:physiology; D015350:Contrast Sensitivity / Q000502:physiology; D005366:Figural Aftereffect / Q000502:physiology; D005556:Form Perception / Q000502:physiology*; D006801:Humans; D009474:Neurons / Q000502:physiology; D009903:Optical Illusions / Q000502:physiology*; D009949:Orientation / Q000502:physiology; D010364:Pattern Recognition, Visual / Q000502:physiology; D010775:Photic Stimulation / Q000379:methods; D011601:Psychophysics