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. 2017 Jan 4;18(2):323–342. doi: 10.1007/s10162-016-0608-2

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© The Author(s) 2017

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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FIG. 6 — Responses to subthreshold paired pulse stimulation. a Predicted effect of conditioner level on the probe threshold as a function of the interpulse delays (lines) along with the corresponding data from Dynes (1996) (D96). b Comparison of the summation latencies obtained with the equal-level condition for the anodic and the cathodic pulses (abscissa) with the corresponding summation latencies (ordinate). Predictions (triangles) are compared with the corresponding distributions of the data of Cartee et al. (2006) (blue and green kernel density functions).