Table 1B. Percent changes in BOLD spectral power before and after preprocessing steps.

	Low pass	Global	White matter	CSF	All	Main effect (F)	Global vs. white matter	Global vs. CSF	Global vs. low pass
Regions of interest (ROIs)	Mean±s.d.	Mean±s.d.	Mean±s.d.	Mean±s.d.	Mean±s.d.	P-value	P-value	P-value	P-value
Right isthums of cingulate cortex	−1.24±0.7	−61.7±19.0	−44.3±22.4	−16.5±21.1	−64.9±18.0	<0.001	0.221	<0.001	<0.001
Left isthums of cingulate cortex	−1.12±1.2	−56.2±20.9	−42.7±21.1	−16.1±21.6	−60.0±19.6	<0.001	0.794	<0.001	<0.001
Right hippocampus	−1.82±0.9	−54.3±23.7	−46.9±28.8	−19.8±24.5	−59.1±22.8	<0.001	1.000	0.004	<0.001
Left hippocampus	−1.17±0.8	−52.2±21.8	−45.8±28.3	−19.4±24.4	−56.7±22.5	<0.001	1.000	0.005	<0.001
Right lateral occipital cortex	−1.01±0.9	−54.8±23.7	−46.7±19.2	−12.6±16.7	−59.3±20.9	<0.001	1.000	<0.001	<0.001
Left lateral occipital cortex	−1.20±1.0	−52.5±22.1	−42.2±21.5	−10.4±15.4	−55.6±21.7	<0.001	1.000	<0.001	<0.001

BOLD, blood oxgen level dependent; CSF, cerebrospinal fluid. Bold represents P<0.05 after Bonferroni correction. Values are mean±standard deviation. P-values represent the results of one-way analysis of variance for the ROI. The effects of each preprocessing step as well as all of the steps combined are presented. Spectral power was derived from 0.016 to 0.078 Hz.