Figure 1.

Directional modulation of bihemispheric M1 unit activity. A, Schematic of the experimental setup for recording spike and LFP activity from both the ipsilateral and contralateral M1 during the performance of a center-out reaching task with the right upper limb. B, Hand trajectories during performance of the center-out task. C, Directional modulation of the firing rate of a single neuron. Panels above respectively show 150 randomly selected waveform traces and the interspike-interval distribution. Solid line is the cosine fit for directional modulation. Error bars are the SEM. D, Fraction of units from each hemisphere that were significantly modulated. Error bars are the SEM. Circles above show the distribution of preferred directions from Monkey R.