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. 2020 Jun 10;14:33. doi: 10.3389/fnsys.2020.00033

Figure 2.

Figure 2

Diverse functions of cortical feedback throughout the hierarchy. (Left) Hierarchical organization of the primate visual system adapted with permission from Felleman and Van Essen (1991). Circled regions are some of the cortical regions discussed in the manuscript. (Right) Proposed functions of cortical feedback, segregated according to source and the target region. (Red) prefrontal cortex (PFC): Brodmann area 46, dorsolateral PFC; (green) premotor cortices: FEF, frontal eye field; DPc, dorsal premotor cortex; MPc, medial premotor cortex; M2, secondary motor cortex; (yellow) higher-order sensory cortices: IT, infratemporal cortex; V4, visual area V4; MT, middle temporal visual area; (blue) lower-order sensory cortices: V1, primary visual cortex; S1, primary somatosensory cortex; A1, primary auditory cortex.