Table 2. Layer-specific comparison of SIRs between STIM and NOSTIM in the primary auditory cortex.

	STIM (n = 16)	NOSTIM (n = 16)	z		P
	Mean (SD)	Mean (SD)
Left Aud layers
I	1.33 (0.28)	1.37 (0.20)	–	0.58	0.6
II/III	1.37 (0.26)	1.32 (0.16)		0.55	0.6
IV	1.34 (0.23)	1.23 (0.15)		1.53	0.1
V	1.35 (0.23)	1.21 (0.14)		1.90	0.06
VI	1.26 (0.20)	1.14 (0.14)		1.90	0.06
Right Aud layers
I	1.33 (0.18)	1.33 (0.22)	–	0.09	0.9
II/III	1.38 (0.17)	1.27 (0.18)		1.45	0.15
IV	1.38 (0.17)	1.20 (0.18)		2.54	0.01*
V	1.38 (0.17)	1.19 (0.19)		2.51	0.01*
VI	1.31 (0.19)	1.11 (0.17)		2.69	0.007*

Mann-Whitney U-tests were used to compare the mean SIRs of Aud 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.