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Schematic illustration of potential routes responsible for the observed activation and deactivations in ipsilateral SI (blue) and MI (green) cortex. Ipsilateral SI receives transcallosal input via area 2 (gray arrow), resulting in activation (+). Corticocortical influences from BA 2 to areas 3b and 4 (red arrows) reduce neuronal activity, resulting in deactivation (−). CS, Central sulcus.
