Figure 2.

Group-level laser-evoked field potentials in the time domain. Data were simultaneously recorded intracortically and epidurally. A, B, Intracortical data were recorded at superficial (A) and deep (B) layers from the bilateral S1 and M1 (colored waveforms). Epidural data (signal averaged across two electrodes; black waveform) were recorded from two electrodes placed in between the S1 and M1. For all recording sites, the largest LFP response was a negative wave peaking at ∼170 ms (i.e., N1 wave). N1 amplitude was overall larger in S1 than in M1, as well as larger in the hemisphere contralateral than ipsilateral to laser stimulation. N1 latency was shorter in S1 than in M1, in both hemispheres. *p < 0.05, **p < 0.01, ***p < 0.001. Error bars represent SEM.