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. Author manuscript; available in PMC: 2012 Oct 18.
Published in final edited form as: Conf Proc IEEE Eng Med Biol Soc. 2011;2011:7533–7536. doi: 10.1109/IEMBS.2011.6091857

Fig. 3.

Fig. 3

Discriminability of S1 responses evoked by stimulation at different locations, pulse rates, and amplitudes. A: Examples of the average cortical response to stimulation on channels 1 (left) and 3 (right) in the L7 DRG at 5 μA and 100 pps. Shown is the average spike count observed 10 – 60 ms following stimulus onset. Dots denote channels showing a significant response; plus symbols (+) indicate channels used for classification. Although they have similar average responses, they can be classified with 90% accuracy. B: Percentage of channel pairs that evoked discriminable S1 responses as a function of the separation distance between the 2 stimulation sites (rate = 100 pps). Only stimulus electrodes that evoked significant responses vs. baseline were included. Pairings were kept within arrays. Distances have been grouped to nearest 0.4 mm.