Fig. 5. Stability of neural properties across consecutive days of brain control.

a. Average directional modulation relationship for a direct and near unit during manual control and brain control on two consecutive days. Partial lines above each tuning curve represent the respective preferred direction for each daily brain control (PD_BC) and manual control (PD_mC) session. Shaded region is the respective variance of the bootstrap distributions of PD_BC and PD_MC. Waveforms and interspike interval distributions from a direct (red) and near (blue) unit on consecutive days are also shown. b. Directional modulation of a far unit on two consecutive days. PD_BC could not be estimated because of a lack of modulation. c. Population distribution of preferred direction changes for indirect and direct neurons (PD_BC3–PD_BC4). For indirect units, the actual (grey bars) and bootstrap (black line) distributions are shown. The dark red line is the bootstrap distribution for direct units. Gray vertical line represents a ΔPD of 0.