Fig. 5: Results from analysis by support vector regression (SVR) for the two monkeys.
From: Dopamine neurons encode trial-by-trial subjective reward value in an auction-like task
The model was trained on neuronal responses and bids using 80% of the data. Bids were predicted from responses with the remaining 20% of the data (five-fold cross-validation method). Bid prediction accuracy is shown as R2 (ordinate; each data point shows mean ± standard error of the mean from 300 iterations) for bid-encoding dopamine neurons (dark blue; DA; n = 32 for Monkey U and n = 41 for Monkey V), all dopamine neurons (second curve from top, light cyan; n = 123 and n = 145 for Monkeys U and V, respectively), non-bid-encoding dopamine neurons (light blue), and shuffled data (three flat curves at bottom in corresponding colors; n = 91 and n = 104 for Monkeys U and V, respectively). Neurons were added to the model in random order (see “Methods”).
