Results from exp. 1 modeling the relationship of peak resistance (Rp) to peak pulse energy (Ep) and phase charge (Q) at constant sensation intensity. Results.

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Presentation transcript:

Results from exp. 1 modeling the relationship of peak resistance (Rp) to peak pulse energy (Ep) and phase charge (Q) at constant sensation intensity. Results from exp. 1 modeling the relationship of peak resistance (Rp) to peak pulse energy (Ep) and phase charge (Q) at constant sensation intensity. (A to D) Ep versus Rp and (E to H) Q versus Rp plots showing all trials from a single participant across sessions, magnitudes of sensation, stimulation locations, and electrode sizes. Each sensation felt at each of the 11 data points of the same condition was equivalent in subjective intensity. Best-fit lines were constrained to go through the origin in (A) to (D), whereas all the lines in (E) to (H) were constrained to go through an optimal point of convergence (−1.67 kilohms, 0.186 μC). Each best-fit line represents a line of constant sensation intensity. (I) r2 regression statistics constrained to the origin for Ep versus Rp and the point of convergence for Q versus Rp across 10 participants and 8 conditions (n = 80). The eight conditions, described in the figure key, cover two sessions, two magnitudes of sensation, three stimulation locations, and two electrode sizes. The r2 distributions for each of the eight conditions are shown in (J) for Ep versus Rp and in (K) for Q versus Rp. A signed-rank test indicated that the r2 values are statistically significantly greater than 0.7 (P < 0.05), denoting a strong correlation across all conditions. Blue crosses represent outlier data points beyond 1.5 times the interquartile range. Aadeel Akhtar et al. Sci. Robotics 2018;3:eaap9770 Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works