Table 4. Layer-specific comparison of SIRs between STIM and NOSTIM in the primary visual cortex.

	STIM (n = 16)	NOSTIM (n = 16)	z	P
	Mean (SD)	Mean (SD)
Left Vis layers
I	1.31 (0.26)	1.14 (0.22)	1.98	0.05*
II/III	1.41 (0.27)	1.25 (0.24)	1.49	0.14
IV	1.40 (0.27)	1.23 (0.24)	1.90	0.06
V	1.41 (0.26)	1.24 (0.24)	2.36	0.02*
VI	1.22 (0.20)	1.06 (0.19)	2.39	0.02*
Right Vis layers
I	1.34 (0.22)	1.13 (0.28)	2.43	0.02*
II/III	1.50 (0.23)	1.23 (0.30)	2.81	0.005*
IV	1.52 (0.22)	1.22 (0.29)	3.15	0.002*
V	1.55 (0.22)	1.20 (0.27)	3.41	<0.001*
VI	1.34 (0.18)	1.05 (0.23)	3.41	<0.001*

Mann-Whitney U-tests were used to compare the mean SIRs of Vis layers. The z-values were calculated from Mann-Whitney's U-values and their standard deviations. SIR is the normalized signal intensity of each ROI to its adjacent Temporalis muscles.

*P<0.05.