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PSYB51H3 (300)


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Matthias Niemeier

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PSYB51- Perception and Cognition
Perceiving and Recognizing Objects
We have processes that combine our features into objects, this is one of the
tasks that defines middle or midlevel vision opposed to low level vision.
Middle (midlevel) Vision: A loosely defined stage of visually processing
that comes after basic features have been extracted from the image (early
vision) and before object recognition and scene understanding (high-level
Middle Vision
The goal of middle vision is to organize elements of visual scene into
groups that we can then recognize as objects
Finding Edges
Lack of edge does not bother our visual system
Illusory Contours: A contour that is perceived, even though nothing
changes from one side of the contour to the other in the image
Rules that Make Contours
The tendency of the visual system to go beyond the info given was
problematic for one of the earliest group of perceptual psychologists, the
Structuralism: A school thought believing that complex objects or
perceptions could be understood by analysis of the components
Structuralists Wilhelm Wundt and Edward Bradfor Titchener argued
that perceptions are the sum of atoms of sensations- bits color,
In structuralist view, perception is built up of local of the local
sensations the way crystal might be built up of an array of atoms .
An illusory contour challenges this view because an extended edge is
seen bridging a gap where no local atom of edgeness can be formed
Structuralism arguments seem to fail
A group of psychologists led by Max Werthemier , Wolfgang Kohler,
and Kurt Koffa formed the Gestalt school
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