. Author manuscript; available in PMC: 2021 Jan 1.

Published in final edited form as: Neurorehabil Neural Repair. 2021 Jan;35(1):44–57. doi: 10.1177/1545968320971741

Table 3.

Association of white-matter areas with tDCS and sham on changes in letter accuracy for trained items at each point-intervention time point (After=immediately after intervention; 2wp=two weeks post-intervention; 2mp=two months post-intervention). Cross-validated increment of coefficient of determination (CV ΔR²), estimated model coefficients (β), standard error (SE) and p-values are shown.

(a) MD values: ROIs

	Time	ROI	CV ΔR²	β (SE)	p-value

tDCS	After	CG_L	0.13	77.93 (26.25)	0.010
	After	SMG_L	0.12	−25.61 (14.01)	0.089

	2wp	-	-	-	-

	2mp	-	-	-	-

sham	After	-	-	-	-

	2wp	SMG_L	0.12	−24.48 (13.93)	0.104

	2mp	-	-	-	-

(b) MD values: fasciculi

	Time	Fasciculus	CV ΔR²	β (SE)	p-value

tDCS	After	-	-	-	-

	2wp	UnF_L	0.11	−29.06 (12.20)	0.035

	2mp	UnF_L	0.17	−29.72 (15.13)	0.075

sham	After	-	-	-	-

	2wp	SLF_R	0.27	−52.38 (17.68)	0.012

	2mp	-	-	-	-

(c) FA values: ROIs

	Time	ROI	CV ΔR²	β (SE)	p-value

tDCS	After	-	-	-	-

	2wp	-	-	-	-

	2mp	-	-	-	-

sham	After	CG_L	0.02	32.72 (14.47)	0.040

	2wp	SMG_L	0.22	24.82 (6.19)	0.002
	2wp	FuG_L	0.06	−16.20 (6.61)	0.032

	2mp	-	-	-	-

(d) FA values: fasciculi

	Time	Fasciculus	CV ΔR²	β (SE)	p-value

tDCS	After	-	-	-	-

	2wp	-	-	-	-

	2mp	-	-	-	-

sham	After	SLF_R	0.21	13.61 (3.80)	0.003
	After	IFOF_R	0.10	5.01 (2.57)	0.073

	2wp	SLF_R	0.52	12.59 (2.31)	<0.001
	2wp	IFOF_R	0.03	2.46 (1.46)	0.120

	2mp	UnF_L	0.22	5.75 (2.40)	0.034
	2mp	SLF_R	0.13	7.76 (3.89)	0.069