Behavior of a network that encodes both valence and novelty.

The network is similar to Fig 5 but a second readout that computes novelty is added. The novelty readout is active for the first presentation of a given CS and zero otherwise. (A) The addition of novelty as a readout dimension introduces dopamine neuron responses that are selective for novel CS. Compare with Fig 5B. (B) The first principal component (PC1) for the network in A is selective for CS novelty. Compare with Fig 5C.