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. Author manuscript; available in PMC: 2015 Sep 1.
Published in final edited form as: Brain Stimul. 2014 Apr 4;7(5):680–689. doi: 10.1016/j.brs.2014.03.011

Figure 5.

Figure 5

Changes of the refractory period during 100 and 200 Hz A-HFS trains were assessed by inserting shorter gaps of 20 ms (refer Fig 4A for the definition of A0 ~ A3). (A) Normalized amplitudes of the preceding APS (A0) and subsequent APS (A1) to the 20 ms prolonged IPI gaps during 100 Hz A-HFS indicate sufficient recovery of A1 amplitudes. (B) Ratios of A2/A1 during 100 Hz A-HFS indicate that the refractory period produced by A1 extended to enough long to significantly suppress the A2 with ~10 ms delay. (C) Similar to (A), but for 200 Hz HFS. (D) Ratios of A2/A1 and A3/A1 during 200 Hz A-HFS also indicate that the refractory period extended to longer than 10 ms.