An analysis of induced motion

The motion induced in a stationary object by a displacing surround invariably was accompanied by an apparent change in the erocentric location of that object. The degree of this apparent spatial displacement significantly correlated with the amount of induced motion seen. Induced movement was, therefore, interpreted in terms of a subjective change in the location of an object in space, as opposed to the object-relative displacement hypothesis proposed by Duncker in 1929. These findings were extended to test critically such other concepts in motion perception as separation of systems.