Fig. 1.

Illustration of a feature-selection mechanism for common-fate grouping. The flashlights at the top illustrate whether or not a direction of motion has been selected. If an observer did not select a direction of motion (illustration at the left), all moving elements in a display would be processed together, and there would be no common-fate grouping. If an observer selected rightward motion (illustration at the right), target elements would be enhanced and form a common-fate group. Changes in the direction of selected motion could be updated via feedback connections within motion-sensitive areas of the visual system (e.g., Martinez-Trujillo, Cheyne, Gaetz, Simine, & Tsotsos, 2007).