Figure 4.

The brain-control task. A, The raster plot for a single neuron during the calibration reach and brain-control trials (10 trials are shown per target and per condition). Thick vertical ticks represent the fixation acquisition, cue onset, and movement onset (go detection) from left to right. B, Firing rate over the shaded interval versus the target locations in the calibration reach (solid) and brain-control trials (dotted). The error bars are SD. C, The LFP trace and execution signal for seven consecutive calibration reach and brain-control trials. Gray vertical lines mark the movement onset for the reach trials and the go detection for the brain-control trials. Dashed horizontal lines mark the threshold to detect the “go” signal. D, The mean execution signal in the calibration reach (solid) and brain-control trials (dotted). E, The mean time course of the power change in the 0–10 and 20–40 Hz bands. At the time of go detection, the power in the 0–10 Hz band increases at the maximal rate while the power in the 20–40 Hz band decreases at the maximal rate. The bands are SEM. Note that in this figure, reach trials are from the parameter calibration set, while the brain-control trials are from the online decoding set.