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. Author manuscript; available in PMC: 2017 Dec 6.
Published in final edited form as: J Neural Eng. 2016 Jun 1;13(4):046009. doi: 10.1088/1741-2560/13/4/046009

Figure 7.

Figure 7

Non-uniform distribution of the preferred directions of neural recordings and offline force prediction accuracy. Polar histograms (blue) show the total number of neural signals with a PD within each of 20 bins dividing the 2D force space, across all datasets for each monkey. There was a marked paucity of signals with PDs near the 0° (flexion) axis for both monkeys, as well as in the 270–360° quadrant for monkey K. The MSE of the optimal force predictions was higher during the presentation of targets falling in these directions (red curve).