Center for Perceptual Systems
Psychology, Neurobiology, INS, & IRC
The University of Texas at Austin
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Vision Research Demonstration
When an ellipse is rotated around its center in the image plane it can generate a 2D rigid, 2D non-rigid or 3D rigid percept. For a demonstration of the 2D percepts see here. Most observers initially report a 2D percept. In the stimuli below a dot is added to the ellipse to help you achieve the 3D percept.
The stimulus will appear to move differently depending on your percept. This can be made explicit by dashing the contour of the stimulus. The stimulus in Figure 2 maintains the same shape as the stimulus in Figure 1, but the motion of the dashed contour appears to be quite different.
The dashed stimulus in Figure 2 appears to contain two motion components. In addition to the rotation around the center of the image that the stimuli in Figure 1 and 2 have in common, there appears to be a clockwise rotation around the center of the 3D percept.