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Olfactory processing in the brain exhibits a number of rhythms,which signify enhanced coherence among many neurons.While the faster gamma rhythm is generated within the olfactory bulb,the slower beta rhythm requires communication between the olfactory bulb and piriform cortex.We investigate how the interplay between the mixed-mode-like oscillations of the bulbar principal cells and the two different delays of their interaction within the bulb and via the cortex may generate these rhythms.