University of Wisconsin Crest - Needs to be Inverted R O K E R S
V I S I O N
L A B O R A T O R Y
University of Wisconsin - Madison
Department of Psychology
Research  |  Publications  |  Participate  |  People

Demonstration of the visual stimulus in our paper: The perceived motion of a stereokinetic stimulus

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.


Figure 1

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.


Figure 2

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.

Next Page >