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Midline lesion abolishes response to contralateral efferent stimulation. Recording from a noncalyx, SC unit (cv* = 0.08); efferent stimulation, 333/s, 5 s, 50 μA. A Cross-section of brain stem shows midline lesion (a) and electrolytic mark of ipsilateral stimulation site (b). Response to contralateral stimulation (B) is abolished after midline lesion (C). The stimulating array was then moved to ipsilateral side and a large response was obtained (D).
