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The proportion (A) and magnitude (B) of coherence in motor unit pairs from tongue and chest-wall muscles. For this analysis we combined all motor unit pairs from both tongue muscles and all pairs from the two chest-wall muscles to compare the proportion and magnitude of coherence in cranial and spinal motoneurons. Note that coherent oscillations in chest-wall muscle motor units are significantly higher than tongue-muscle units over the 8–20-Hz bandwidth.
