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How can a visual system predict disocclusion
events? Somehow it must maintain a representation of the information
that it will need. The representation must carry the properties of
the occluded object, such as its position, velocity, and shape. Since
no information about the occluded object is directly available while
it is occluded, this representation must originate before it becomes
occluded. This representation must interact with information about
the occluder so that when the occluded object reaches the end of the
occluder, a prediction that it will become visible again is generated.
If the occluded object is part of a group of objects, some of which
are visible, then the motion of the visible objects in the group can
control the perceived motion of the invisible object
[2,14]. Therefore, we argue that the
representation of the occluded object can be controlled (e.g., its
direction altered) in mid-course, even while the object is invisible.
This argument favors a persistent form of representation (the inferred
invisible object is represented as a real object, with properties of
motion, shape, position, etc.), rather than a ballistic form (with a
representation impervious to alteration once it has been launched)
[9].
Next: Representation of Invisible
Up: The Predictivity Principle:
Previous: Predictivity Implies Prediction