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Table 1 Weekly medians and interquartile ranges (IQR) of electrode impedances for all USEAs. Post-hoc testing between the first and final post-implant sessions revealed a significant pairwise drop in impedance for electrodes on S4’s median-nerve USEA (p < 0.0001; two-tailed Wilcoxon’s signed-rank test, denoted with a), but did not reveal a statistically significant pairwise change for the remaining 3 USEAs (p = 0.82 S3 ulnar, p = 0.12 S3 median, p = 0.99 S4 ulnar)

From: Restoration of motor control and proprioceptive and cutaneous sensation in humans with prior upper-limb amputation via multiple Utah Slanted Electrode Arrays (USEAs) implanted in residual peripheral arm nerves

USEA Number of non-failed electrodes Week 1 Week 2 Week 3 Week 4
S3 Median Array 41 96 kΩ (65 kΩ) 81 kΩ (41 kΩ) 89 kΩ (36 kΩ) 99 kΩ (47 kΩ)
S3 Ulnar Array 81 171 kΩ (79 kΩ) 141 kΩ (107 kΩ) 110 kΩ (52 kΩ) 188 kΩ (96 kΩ)
S4 Median Array 60 167 kΩ (117 kΩ) 186 kΩ (70 kΩ) 337 kΩ (71 kΩ) 85 kΩ (69 kΩ) a
S4 Ulnar Array 59 127 kΩ (69 kΩ) 143 kΩ (99 kΩ) 194 kΩ (101 kΩ) 118 kΩ (96 kΩ)