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Published online by Cambridge University Press: 02 February 2021
PCT assumes that purposeful behavior is produced by a hierarchy of control systems, with control systems at each level of the hierarchy controlling different types of perceptual variables. This chapter described the two main lines of research that have been aimed at exploring different aspects of this hierarchy. One line of research is aimed at testing the proposed nested relationship between systems in the hierarchy. The other is aimed at testing Powers' proposal regarding the types of perceptual variables controlled by control systems at each of the different levels of the hierarchy.
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