Figure 8.

Illustration of the procedure in Experiment 5. First, targets were assigned (a), then all objects started moving around the display while frequently rotating 30° left and right (b), a change in lateral orientation occurred at a random time point between 2 and 6 seconds from start of tracking (c; notice that the church changes lateral orientation, as signaled by the position of the belfry). The movements stopped once a total of 8 seconds had elapsed or the observer pressed a button. Black disks immediately occluded the objects as the movements stopped (d). Participants then indicated the position of the changed object (e). Images adapted with permission (Snodgrass & Vanderwart, 1980, pp. 197–204).