Figure 6.

A model integrating aversive and appetitive associations. Recent data indicate that aversive and appetitive associations for the same odor are stored in different MB compartments. In this model, responses to an odor are regulated by a balance between appetitive and aversive signals. Aversive responses are induced by an inhibition of appetitive signals, while appetitive responses are induced by an inhibition of aversive signals. Small green and black circles in semantic memory encoding compartments represent synapses whose activity is modulated by prediction error signals. Dotted lines represent other putative connections that may regulate the balance between appetitive and aversive responses