Models of heterogeneous dopamine signaling in an insect learning and memory center
Fig 4
Comparison to networks without dopamine-gated plasticity.
(A) Behavior during first-order conditioning, similar to Fig 3A, but for a non-plastic network. Because of the need for non-plastic networks to maintain information using persistent activity, performance degrades with longer delays between training and test phases. We therefore chose this delay to be shorter than in Fig 3A. Results are shown for a network optimized with 10 odors. (B) Same as A, but for a trial in which a CS-US pairing is followed by the presentation of a neutral CS. (C) Difference in response (reported valence) for CS+ and neutral CS as a function of the number of odors. Each CS+ is associated with either a positive or negative US. For comparison, the corresponding response difference for networks with dopamine-gated plasticity is shown in blue. Error bars represent s.e.m. over 8 network realizations.