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. 2011 Jul 27;6(7):e22665. doi: 10.1371/journal.pone.0022665

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Akiyama et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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A: cold block. Left-hand PSTH shows averaged firing of 9 units before and during scratching under control conditions. Middle PSTH shows reduction in the degree of scratch-evoked inhibition during cold-block of upper cervical cord. Right-hand PSTH shows recovery of scratch-evoked inhibition after rewarming the cervical cord. B: Spinalization. Shown are mean PSTHs of 6 units from separate animals, before (lefthand PSTH) and after (right-hand PSTH) complete transection of the upper cervical spinal cord.