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Significance In most primary sensory cortical areas, sensory information is topographically organized. The spatial mapping of sensory features has proven useful in elucidating circuit mechanisms that underlie sensory representations in the brain. The piriform cortex is postulated to play a prominent role in the formation of odor percepts but lacks a topographic representation for odor information. Consequently, the circuit mechanisms underlying odor processing have remained elusive. We show spatial patterning of inhibition along the rostrocaudal axis of piriform cortex that differs with respect to excitatory and inhibitory neurons. Exploration of the underlying mechanisms revealed that inhibitory circuits differ in rostral vs. caudal piriform cortex. This rostrocaudal spatial organization could provide a scaffold for investigating circuit computations during odor processing.

Differential inhibition of pyramidal cells and inhibitory interneurons along the rostrocaudal axis of anterior piriform cortex