Plots showing how innate valences shape learning in the three MBONs of the model. In each plot, each row has data for one of nine simulated odours, the innate valences of which were specified by evoked changes in DAN spiking ( y axis). We simulated one training bout (using the protocol of Fig. 3d ) with each odour as the CS + (top) or CS − (middle); these six plots show, as a function of time after training, changes in odour-evoked MBON spiking relative to pre-training rates, with time zero denoting immediately after training. The bottom row shows biases between CS + - and CS − -evoked spiking changes. After one training bout, MBON-γ1pedc>α/β exhibits short-lived depression, MBON-α2sc undergoes a longer-lived plasticity, the sign of which depends on the innate valence of the odour, and MBON-α3 exhibits the longest-lasting plasticity. Extended Data Fig. 10 shows more results.
