This chapter argues that cortical networks and the knowledge they represent are hierarchically organized in layers by order of complexity or generality of cognitive content. These layers correspond to cortical stages for the processing and representation of sensory information. Further, the perceptual networks are amply interconnected within and between layers, as well as with the motor networks or cognits of frontal regions. The chapter assembles evidence of an order in the cortical processing of sensory information that corresponds isomorphically to the mental or phenomenal order of perception. The first two sections of the chapter deal with psychological aspects of perception; the last three deal with the mechanisms by which networks of posterior and frontal cortex process sensory information in perception. The limited capacity of sensory systems to process sensory information is the primary reason why selective attention serves the categorizing in one particular sector of perception at the expense of all others. There are two major components of selective attention: inclusion and exclusion. This chapter also discusses gestalt psychology, perceptual binding, and perception-action cycle.
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