The sense of smell is undeniably important, driving animal behaviors like food search, social interactions and predator avoidance. Volatile chemical compounds, present in the natural environment, are readily detected by the olfactory system. I have been interested in studying the functional organization of the first brain relay of the mouse's olfactory pathway, namely the olfactory bulb. At this level, odorant molecules evoke complex combinatorial spatiotemporal patterns of activated glomeruli, called odor maps, which provide a two-dimensional representation of receptor activation in the periphery. Thus, features of odor maps such as density and topography will strongly influence how the population of OB's output neurons is going to be activated. For these, during my PhD, I investigated how odorant stimuli are encoded in the glomeruli array as odor maps to better elucidate how olfactory information is processed in the OB.