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. 2024 Jul 17;10:17. doi: 10.1186/s42234-024-00149-2

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© The Author(s) 2024, corrected publication 2024

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Fig. 4 — Stimulation contacts located adjacent to the intervertebral disc rather than beneath showed no observable motor response within recorded ESRs. Representative data from subject S2 with stimulation amplitude of 6.0 mA. A Diagram of implanted epidural leads with the stimulating cathode located as either on/near or off the intervertebral disc. Contact 11 (white square) on the second lead indicates the recording channel for reported ESR waveforms. Circular markers on the epidural stimulation lead indicate electrode contacts as either anode (yellow) or cathode (red). B Recorded ESRs with ECAP (1-2.5 ms) and EMG windows (3-13 ms) and C intramuscular EMG (IM) recordings were represented as 300 individual traces with a median trace overlay. D Calculated RMS for individual trials of the EMG components of recorded ESRs (top) and intramuscular EMG recordings (bottom) were plotted with respect to ‘on-disc’ (red) and ‘off-disc’ (blue) stimulations. Mean RMS values were represented as solid lines (‘on-disc’) and dashed lines (‘off-disc’)