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Simplified KIII system and its relationship with the anatomy of the olfactory system. Top layer: Inputs from the receptors via the glomeruli. Additional layers: olfactory bulb (OB), anterior olfactory nucleus (AON), prepyriform cortex (PC). Downward arrows are feedback connections, upward arrows are delayed feedback connections. Black and white circles: inhibitory and excitatory populations, respectively (Freeman 1986)
