Fig. 3

Population representations of somatosensory sequential events. a Averaged firing rates (Z-scores; 50 trains) for cells recorded in S1 (top) and DLS (bottom) during somatic train stimulations at 3.3 Hz. Neural activity was aligned to the first stimulus of the sequence and neurons were sorted according to the time they reached the highest firing rate between the first and second stimulus. b Low-dimensional projection of the population activity in S1 (top) and DLS (bottom) evoked by 50 stimulation trains. Dots correspond to the moments when the different stimuli of the train were presented. c Distribution of silhouette coefficients for the stimulus-evoked clusters in (c). ** Wilcoxon rank-sum test p < 0.001. d Comparison of Support Vector Machine classifier performance using cortical (blue), striatal (orange), and shuffled (yellow) population activity as a function of the number of units used for training and testing. Randomly selected cells were progressively added in ten-cell steps until reaching the original population size. The procedure was repeated 500 times and the mean + SD of these values is presented