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. Author manuscript; available in PMC: 2011 Jul 20.
Published in final edited form as: Curr Opin Neurobiol. 2009 Jun 24;19(4):408–414. doi: 10.1016/j.conb.2009.05.007

Figure 1.

Figure 1

Thalamo-cortical circuitry. Parvocellular (P) neurons in layers 3–6, and magnocellular (M) neurons in layers 1–2 of the LGN, project to layer 4 of V1. Koniocellular (K) neurons in the thin layers of the LGN project to the superficial layers of the visual cortex (not shown). V1 provides feedback from layer 6 to the LGN. The pulvinar is thought to receive largely feedforward input from layer 5 of the cortex, i.e. information destined for more advanced levels of processing, and feedback input from layer 6. The pulvinar projection to the cortex terminates in layer 4 and in more superficial layers. Many different cortical areas are connected via the pulvinar; however, here we only show V1 and extrastriate cortex for clarity. FF = putative feedforward (green); FB = putative feedback (red).