Fig. 8.

Schematic diagram of the model proposed by our study. Odors are separately represented with three different glomerular groups in the AL, reflecting odor valence as well as chemical structures. Attractive and aversive odors are further segregated and integrated into two different regions in the LH and partly separated in the MB. Innate odor-guided behaviors could be induced by reading out the activation patterns of these two regions in the LH. The MB output could modulate the innate behavior by associative learning (see Discussion)