PSYB51H3 Chapter 4: B51.CH4.docx

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11 Apr 2012
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Middle (midlevel) vision: a loosely defined stage of visual processing that comes after basic features have been extracted from the image (early vision) and before object recognition and scene understanding (high-level vision) Goal of middle vision is to organize the elements of a visual scene into groups that we can then recognize as objects. Illusory contours: a contour that is perceived, even though nothing changes from one side of the contour to the other in the image. Structuralists: argued that perceptions are the sum of atoms of sensation bits of colour, orientation etc; perception is built up of the local sensations the way a crystal might be built up of an array of atoms. Structuralism: a school thought believing that complex objects or perceptions could be understood by analysis of the components. Gestalt: form , school of thought stressing that the perceptual whole could be greater than the apparent sum of the parts.

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