Table 2 Activation in the brainstem.

Brainstem region		Muscle	Peak-level		Cluster-level		Peak coordinate [mm]
Area	Laterality		\(\text {t}_{{max}}\)	\(\text {p}_{\text {FWE}}\)	Voxels in cluster	\(p_{\text {FWE}}\)	x	y	z
Midbrain	R	FCR	10.22	< 0.001	21\(^{\textit{a}}\)	< 0.001	4	− 36	− 6
	R		5.93	0.026	2	0.009	4	− 30	− 4
	L		6.84	0.005	-Part of cluster a-		− 6	− 36	− 8
	L		5.62	0.049	1	0.019	− 6	− 30	− 2
	R	ECU	6.86	0.004	2	0.008	6	− 28	− 12
	R		6.21	0.015	2	0.008	2	− 36	− 6
	L		6.56	0.008	2	0.008	− 4	− 30	− 2
Pons	R	FCR	8.02	< 0.001	7	< 0.001	2	− 20	− 22
	R		6.62	0.007	1	0.019	6	− 26	− 42
	R		5.94	0.026	1	0.019	6	− 36	− 26
	R		5.81	0.033	1	0.019	8	− 22	− 40
	L		6.79	0.005	6\(^{b}\)	< 0.001	− 8	− 30	− 26
	L		5.95	0.025	-Part of cluster b-		− 8	− 24	− 24
	L		6.10	0.019	1	0.019	− 14	− 28	− 38
	L		6.00	0.023	3	0.004	− 8	− 28	− 38
	R	ECU	5.90	0.028	1	0.019	16	− 30	− 30
	L		9.12	< 0.001	12	< 0.001	− 10	− 28	− 36
	L		6.46	0.009	6	< 0.001	− 10	− 32	− 24
Medulla	R	FCR	7.45	0.002	5	< 0.001	8	− 42	− 40
	R		6.65	0.006	8\(^{c}\)	< 0.001	6	− 36	− 38
	R		5.75	0.037	-Part of cluster c-		8	− 36	− 42

Superscripts on the cluster volume, when present, refer to clusters with multiple peaks. Coordinates are express in MNI space.

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