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The motor sector of the RE gates differently thalamo-cortical signals related to the distal and proximal forelimb. Arrow width indicates hypothesized efficacy of connections. Circled plus and minus signs indicate excitatory and inhibitory inputs, respectively. MC, motor cortex; SC, spinal cord; VL, ventrolateral nucleus of the thalamus. “Proximal” and “distal” indicate compartments of neural structures related to corresponding parts of the forelimb. See text for detailed explanation.
