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Amodal perception is the perception of the whole of a physical structure when only parts of it affect the sensory receptors.
For example, a table will be perceived as a complete volumetric structure even if only part of it—the facing surface—projects
to the retina; it is perceived as possessing internal volume and hidden rear surfaces despite the fact that only the near
surfaces are exposed to view. Similarly, the world around us is perceived as a surrounding plenum, even though only part of
it is in view at any time. Another much quoted example is that of the "dog behind a picket fence" in which a long narrow
object (the dog) is partially occluded by fence-posts in front of it, but is nevertheless perceived as a single continuous object.
Albert Bregman noted an auditory analogue of this phenomenon: when a melody is interrupted by bursts of white noise, it is
nonetheless heard as a single melody continuing "behind" the bursts of noise.
Formulation of the theory is credited to the Belgian psychologist Albert Michotte and Fabio Metelli, an Italian psychologist,
with their work developed in recent years by E.S. Reed and the Gestaltists.
Modal completion is a similar phenomenon in which a shape is perceived to be occluding other shapes even when the shape
itself is not drawn. Examples include the triangle that appears to be occluding three disks in the Kanizsa triangle and the
circles and squares that appear in different versions of the Koffka cross.
Lehar, Steven (1999). "Gestalt Isomorphism and the Quantification of Spatial Perception" (pdf). Gestalt Theory 21 (2): 122–139 .
Breckon, Toby; Fisher, Robert (2005). "Amodal volume completion: 3D visual completion" (pdf). Computer Vision and Image
Understanding 99 (3): 499–526. doi:10.1016/j.cviu.2005.05.002 . Retrieved 2005.
Albert Bregman Auditory Scene Analysis MIT, 1990'
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