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. Author manuscript; available in PMC: 2012 Aug 2.
Published in final edited form as: Nature. 2012 Jan 18;482(7383):85–88. doi: 10.1038/nature10754

Figure 2. VTA neurons show three distinct response types.

Figure 2

a, Responses of example neurons. b, Responses of all neurons. Yellow: increase from baseline, cyan: decrease from baseline. Each row represents one neuron. The similarity order of the three main clusters is arranged to match the order presented in (a). c, Top, the first three principal components of the auROC curves. Points are coloured based on hierarchical clustering from the dendrogram. Bottom, classification of neurons based on response differences between big-reward and no-reward trials during the delay versus during the CS or US. d, Average firing rates from Types I - III neurons.