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Basic circuit of the mammalian neocortex. Abbreviations: SA, specific sensory afferents; NSA, non-specific sensory afferents; DP, deep pyramidal cell; SP, superficial pyramidal cell; I, intrinsic neurons (excitatory stellate cells and inhibitory interneurons are lumped together); rc, recurrent collateral. Arrows indicate direction of flow of activity. Open profiles: excitatory synaptic action; filled profiles: inhibitory synaptic action. From Shepherd (1974).
