Three-dimensional shape from second-order orientation flows
Related Experiment Video
Updated: Jun 24, 2026

Methods for Measuring the Orientation and Rotation Rate of 3D-printed Particles in Turbulence
Published on: June 24, 2016
1Neuropsychology Doctoral Subprogram, CUNY Graduate Center, 365 Fifth Ave, NY 10016, USA.
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.
Related Concept Videos
Irrotational Flow
Oriented Surfaces
Introduction to Types of Flows
Two-dimensional flow involves changes in both length and height, as seen in air...
Uniform Depth Channel Flow
Cylinders in Three-Dimensional Space
Design Example: Flow of Oil Through Circular Pipes

