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Fig. 2. Two examples of muscle response to brain stem stimulation taken from different animals. A: short-duration bilateral atonia in the neck muscles following a 500-ms train applied to the medial pons. The muscle tone returned to the baseline level at the end of the stimulation. B: pontine stimulation produced very long duration (12 s) muscle-tone suppression. The stimulation induced more potent effect on the contralateral than the ipsilateral side. RNM and LNM, right and left neck muscles, respectively; IRNM and ILNM, integrated right and left neck muscle activities.

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