The anterior olfactory nucleus (AON) and the piriform cortex (Pir) are the two primary sensory cortices critical for olfaction. Although it is well documented that both cortices overlap significantly in their functions in olfactory processing, molecular and anatomical tracing studies have indicated otherwise. Consequently, our present understanding of the functions of AON and Pir in olfactory processing at the systems level remains incomplete. In this study, we employed optogenetic fMRI to interrogate the role of AON and Pir in processing olfactory inputs and beyond, and the associated long-range olfactory pathways and their spatiotemporal response properties.
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