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Epidural electrode array placement. The 8×8 grid of dots indicates the approximate placement of the 64-channel epidural wire-and-acrylic electrode arays. The implant location was chosen to target upper-limb areas of the motor and premotor cortices (ArS=Arcuate sulcus; CS=Central sulcus). Grey areas indicate locations in which intracortical microelectrode arrays had previously been implanted and removed in monkey I (A) and monkey II (B).
