PMC9397879_01
Study protocol and BCI motor priming paradigm. (A) The 18 week study protocol showing primary and secondary outcome measures. (B) BCI priming setup. The participant wore an EEG cap and sat opposite a computer screen. The participant provided written consent that his photograph be used in any publications. (C) A simplified version of the BCI motor priming paradigm as displayed on a computer screen and observed by the participant. The participant's objective was to attempt repetitive bimanual finger flexion/extension to guide a photo-realistic basketball to a target. The ball moved horizontally at a constant rate. Vertical displacement was influenced by the participant's EEG and his ability to engage with the priming task.
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After a two-week baseline period, the first phase involved five weeks of tSCS training three times per week, and a second phase introduced BCI motor priming before tSCS training for a further five weeks (Figure 1A). The participant positioned his wheelchair opposite a computer screen and was fitted with an EEG cap, as shown in Figure 1B. Each repetition, or "trial", began with a photo-realistic basketball at the center-left of the computer screen, and a target either at the top-right or bottom-right (see Figure 1C). Figure 1A). Functional outcome measures were performed on different days from hand training sessions, and stimulation was not applied during any assessments.