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Tracking objects out of the observer’s view

In everyday life, we often view objects through a limited aperture (e.g., soccer players on TV, or cars slipping into your blind spot on a busy road), where objects often move out of view and reappear in a different place later. We modelled this situation in a series of Multiple Object Tracking experiments, where we introduced a cover on the edges of the observed area and manipulated its width. This introduced systematic occlusions, which were longer than in previous MOT studies. Exp.1 (N=50) showed that tracking under such conditions is possible, although difficult. In Exp.2 (N=50) we manipulated tracking workload and found the performance improved in the most difficult condition with high amounts of cover. In Exp.3 (N=50), we asked people to keep track of objects’ identities (MIT). Although MIT is subjectively more demanding, memorizing identities improved performance in the most difficult conditions. Contrary to previous reports, we also found that even partial occlusions negatively affected tracking.