TABLE 2.

ALFF differentiation between PI and healthy participants; ALFF and FC changes with right precuneus after taVNS treatment.

Brain regions	Side	Talairach			Number of	t values
		coordinates			voxels
		x	y	z
PI > HC(Pre_ALFF)
Precuneus	right	16	−56	40	71	10.0
Pre_ALFF > Post_ALFF
Precuneus	right	6	−48	51	55	−4.3
Post_ALFF > Pre_ALFF
Middle occipital gyrus	left	−29	−76	15	77	4.4
Pre_FC > Post_FC
Angular	right	57	−57	48	91	−3.4
Superior frontal gyrus	right	−27	66	18	37	−3.9
Middle frontal gyrus	right	39	27	54	49	−3.7

ALFF, amplitude of low-frequency fluctuation; FC, functional connectivity; PI, primary insomnia; HC, healthy participants; Pre, before taVNS treatment; Post, after taVNS treatment.