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Anatomic reconstruction of the locations of penetrations in the left and right precentral cortex of monkey G in which neural data described in this report were collected. Broken line, approximate border between the primary motor cortex [M1, cortex in which intracortical microstimulation (icms) currents <20 μA often evoked movements] and premotor cortex (PMd, cortex in which icms currents <20 μA rarely evoked movements). CS, central sulcus; PCD, precentral dimple; AS, arcuate sulcus.
