Prediction accuracy of the lever movement trajectory relative to neural ensemble activity of pull cells. A, The linear model prediction of the lever trajectory (gray) from 15 primary-clustered cells (black) and nine nonclustered cells (blue) in the imaged field shown in Figure 8B. One of the test segments of the trajectory is shown. The correlation coefficients, c, between the predicted and real trajectories for this segment were 0.55 and 0.40 in the 15 primary-clustered and nine nonclustered cells, respectively. B, Curves of cross-validation results were estimated by neuron-dropping analyses of the primary-clustered (black) and nonclustered (blue) cells in A. The dotted line indicates a cell number of nine. C, Comparison between c of primary-clustered cells and c of nonclustered cells for the same numbers of cells. Here, c values were calculated using whichever cell number was the smallest, the number of primary-clustered cells or the number of nonclustered cells in each imaged field. Each line indicates one imaged field. These analyses were performed from the 30 fields that included a primary cluster and ≥3 nonclustered cells (16 mice). *p = 0.032 by the Wilcoxon signed-rank test. D, Line plots with one line for each imaged field going from the mean c of single primary-clustered cells to the mean c of single nonclustered cells. These analyses were performed from the 30 fields indicated in C. *p = 0.020 by the Wilcoxon signed-rank test.