Our understanding of the lower hierarchical levels of the visual neocortex is consistent with the PRTM I described in the previous chapter, and observation of the hierarchical nature of neocortical processing has recently extended far beyond these levels. University of Texas neurobiology professor Daniel J. Felleman and his colleagues traced the “hierarchical organization of the cerebral cortex…[in] 25 neocortical areas,” which included both visual areas and higher-level areas that combine patterns from multiple senses. What they found as they went up the neocortical hierarchy was that the
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