Table 2.

Summary of results from the finger-flexion task

Location	Total number of electrodes	Significant electrodesa		Median ΔPACb
		$\mathrm{M}{\mathrm{I}}_z$	$R_{\mathrm{PAC}}$	$\mathrm{\Delta }\mathrm{M}{\mathrm{I}}_z$	$\mathrm{\Delta }{R}_{\mathrm{PAC}}$
preCG	98	24 (24.5%)	25 (25.5%)	3.08	0.020
postCG	26	6 (23.1%)	1 (3.8%)	2.04	0.047
aPreCS	134	32 (23.9%)	30 (22.4%)	2.35	0.030

^a Number and proportion of electrodes with significant phase–amplitude coupling (PAC), measured using the z-scored modulation index $(\mathrm{M}{\mathrm{I}}_z)$ or the GLM framework $(R_{\mathrm{PAC}})$ during either the baseline or flexion-onset interval.

^b The median change $(\mathrm{\Delta })$ in PAC ( $\mathrm{M}{\mathrm{I}}_z$ or $R_{\mathrm{PAC}}$) per electrode between the baseline and flexion-onset intervals (i.e., baseline minus flexion onset). preCG, precentral gyrus; postCG, postcentral gyrus; aPreCS, anterior to the precentral sulcus.