Fig. 3: Properties of primary hand position-tuned cells.
From: Hand position fields of neurons in the premotor cortex of macaques during natural reaching
Distributions of spatial coherence (A), spatial sparsity (B), field size (C), and number of position fields per cell (D) across all primary hand position-tuned cells (n = 50). (E) Comparison of lengths of two principal axes of valid position fields (P = 1.71 × 10−12, n = 39 valid fields, one-sided paired t-test). F Distributions of the valid position fields across all sessions for each monkey. Colored lines distinguish fields from different hand position-tuned cells. These positions are relative to the nose position of the monkey, which was set as (x, y) = (0, 0). Dashed black lines indicate monkeys’ reaching boundaries. G Examples of observed and decoded hand trajectories using different cell groups. Gray lines denote observed trajectories, blue lines denote decoded trajectories using all cells, yellow lines denote decoded trajectories using stable cells, and red lines denote decoded trajectories using primary hand position-tuned cells. The results shown are based on the entire testing dataset for one session from Monkey B, with the stationary period excluded. The horizontal scale bar represents 10 s. Trajectories along the Z axis are calculated from the XZ plane. H Comparison of decoding performances using different groups of cells. All cells vs. primary hand position-tuned cells: P = 0.0046; stable cells vs. primary hand position-tuned cells: P = 0.0034; primary hand position-tuned cells vs. random-select cells1: P = 1.89 × 10−4; primary hand position-tuned cells vs. random-select cells2: P = 3.37 × 10−4. n = 18 sessions, one-sided paired t-test for comparisons. ** P < 0.01, *** P < 0.001. Source data is provided as a Source Data file.
