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A black and a white target are displayed, in five different conditions, on five grey backgrounds having different degrees of brightness (from very bright to very dark). The results show that the target having the higher contrast with its background is perceived as the nearer. With the off-white background, e.g., the black target appears as the nearer to the… (More)
A disc of unvarying brightness and position is presented against a background whose brightness is continuously changing up and down. This change is perceived as a pendular movement to and from the subject and, in its turn, clearly induces an analogous but contrary movement in the disc.
Some illusory effects of movement are described that are easily observable when the subject is in rapid locomotion (driving a car or travelling on a train) and gazes fixedly at a particular point of the scene. These effects are essentially characterized by deformations and displacements of parts of the environment. It is suggested that the phenomenon… (More)