Figure 1.

Examples of cortical mapping and neuronal tracer placement and reconstruction, in monkeys M601, M506, M603, M604, and M1108. In M601, which was typical, extracellular recordings were made in the right (deprived) cortex first, and the hand mapped (dashed gray lines) to determine boundaries for digits 1–3 (D1–D3). Fewer recordings were made in this animal on the left side, since we were only interested in determining D1 and D3 borders for injection placement. Equivalent injections were made bilaterally, and those in motor cortex were placed according to somatosensory cortex recordings. Sections were processed through all injections to ensure that white matter was not involved and that there was no cross sulcus contamination. There was no visible damage or necrosis observed at the injection sites within any cortical injection series. A series of sections in M601 through the BDA injections on the right side are shown. Gray vertical line in upper right image indicates the coronal plane of the BDA section series. Individual injection site volumes were not estimated, given poor definition of the injection borders of the tracers LYD and BDA. However, injections were found to be equivalent in size and placement across animals. Lower maps show additional examples. Scale bar in lower images = 1mm.