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==A hierarchy of control==
[[File:Hierarchical Organisation 01.png|thumb|right|alt=Organisation of feedback loops at different levels as a basis of a hierarchy of control|Hierarchical Organisation of feedback loops at different levels]]
Perceptions, in PCT, are constructed and controlled in a hierarchy of levels. For example, visual perception of an object is constructed from differences in light intensity or differences in sensations such as color at its edges. Controlling the shape or ___location of the object requires altering the perceptions of sensations or intensities (which are controlled by lower-level systems). This organizing principle is applied at all levels, up to the most abstract philosophical and theoretical constructs.
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