Supplementary Figure 1: Impact of continuous EES on the threshold to detection of passive movement test performance.

Scatter plots reporting the detection angle and and plots reporting the error rate (percentage correct trials ± 95% CI) on the TTDPM test performance without EES and when delivering continuous EES at 0.8 and 1.5 times motor response threshold amplitudes and a range of EES frequencies. Different EES frequencies were tested on subject #1 (10 Hz, 50 Hz, 100 Hz) and subject #3 (30 Hz, 50 Hz). At 1.5 motor response threshold amplitude, EES frequencies below 50 Hz induced spasms in the muscles and were thus not tested. Grey dots report the detection angle for successful trials, while pink dots and red crosses indicate false positive and failure to detect movement within the allowed range of motion, respectively (n = 65 for subject #1 and n = 66 for subject #3). *, P < 0.05, Clopper-Pearson non-overlapping intervals, two-sided.