Timeline of the three trial types in a block and the rest trial.

<p>The ‘Warning’ and ‘Go’ represent the auditory ‘warning’ and ‘go’ cue, respectively. The small arrows pointing down indicate when SAI was tested. Before the experiment, the researcher defined whether the low and high tone meant move 2<sup>nd</sup> or 5<sup>th</sup> digit, respectively. The movement trial indicates trials that were used for analysis, while the dummy trial indicates trials that were not used for analysis. In this figure, 2<sup>nd</sup> digit movement was being analyzed and the high tone indicates the movement condition, while the low tone would inform the participant to perform the 5<sup>th</sup> digit movement and would serve as the dummy trial. ‘100 ms’ on the left side of the timeline represents the time between the ‘warning’ cue and when SAI was tested in the post-warning 1 phase (PW1). ‘1 s’ represents the time between the ‘warning’ cue and when SAI was tested in the post-warning 2 phase (PW2). ‘100 ms’ on the right side of the timeline represents the time between ‘go’ cue and when SAI was tested in the post-go phase (PG). ‘2–3 s’ is the varied interval between the ‘warning’ and ‘go’ cue, while the ‘4–5 s’ indicate the varied length of the trial. In the “no stimulation” condition, neither TMS nor nerve stimulation was delivered, but the participant still completed the trial with the ‘warning’ and ‘go’ cue present. The rest trial, SAI was tested, but no auditory cues were given and the participant did not complete the movement.</p>