Table 2.

Tissue fractions and quality metrics (mean ± s.d.) of the left (dominant) and right (non-dominant) sensorimotor voxel for both young and older adults.

TISSUE FRACTION	DOMINANT (LEFT) SENSORIMOTOR VOXEL			NON-DOMINANT (RIGHT) SENSORIMOTOR VOXEL
	YOUNG	OLDER	p value	YOUNG	OLDER	p value
GRAY MATTER	0.334 ± 0.030	0.257 ± 0.030	<0.001	0.355 ± 0.031	0.267 ± 0.033	<0.001
WHITE MATTER	0.605 ± 0.037	0.623 ± 0.042	0.051	0.573 ± 0.034	0.598 ± 0.040	0.035
CEREBROSPINAL FLUID	0.060 ± 0.015	0.119 ± 0.036	<0.001	0.072 ± 0.019	0.134 ± 0.031	<0.001
QUALITY METRIC	YOUNG	OLDER	p value	YOUNG	OLDER	p value
FREQUENCY DRIFT (Hz)	0.461 ± 0.263	0.743 ± 0.304	<0.001	0.418 ± 0.242	0.779 ± 0.332	<0.001
FIT ERROR	4.154 ± 1.337	4.513 ± 1.663	0.635	4.228 ± 1.050	4.469 ± 1.233	0.689