Example Trial Sequence.

<p>The target was first presented alone monocularly for 2 seconds followed by an abrupt onset of the competitor in the other eye. This onset-flash suppression procedure ensured that the competitor dominated the percept for a period of time following its onset. One second after the competitor onset, the target changed its orientation (4° clockwise or counterclockwise; for illustration purposes the orientation change is more pronounced here). Observers reported the direction of the orientation change by pressing one of two buttons.