Dissociated patterns of anti-correlations with dorsal and ventral default-mode networks at rest.
Previous studies of resting state functional connectivity have demonstrated that the default-mode network (DMN) is negatively correlated with a set of brain regions commonly activated during goal-directed tasks. However, the location and extent of anti-correlations are inconsistent across different studies, which has been posited to result largely from differences in whether or not global signal regression (GSR) was applied as a pre-processing step. Notably, coordinates of seed regions-of-interest defined within the posterior cingulate cortex (PCC)/precuneus, an area often employed to study functional connectivity of the DMN, have been inconsistent across studies. Taken together with recent observations that the DMN contains functionally heterogeneous subdivisions, it is presently unclear whether these seeds map to different DMN subnetworks, whose patterns of anti-correlation may differ. If so, then seed location may be a non-negligible factor that, in addition to differences in preprocessing steps, contributes to the inconsistencies reported among published studies regarding DMN correlations/anti-correlations. In this study, they examined anti-correlations of different subnetworks within the DMN during rest using both seed-based and point process analyses, and discovered that: (1) the ventral branch of the DMN (vDMN) yielded significantly weaker anti-correlations than that associated with the dorsal branch of the DMN (dDMN); (2) vDMN anti-correlations introduced by GSR were distinct from dDMN anti-correlations; (3) PCC/precuneus seeds employed by earlier studies mapped to different DMN subnetworks, which may explain some of the inconsistency (in addition to preprocessing steps) in the reported DMN anti-correlations. Hum Brain Mapp 38:2454-2465, 2017. © 2017 Wiley Periodicals, Inc.
Department of Radiology, Stanford University, Stanford, California, 94305.|Department of Electrical Engineering, Stanford University, Stanford, California, 94305.
Jingyuan E
0000-0003-3686-2983
JE
Chen
Department of Radiology, Stanford University, Stanford, California, 94305.
Gary H
GH
Glover
Department of Neurology and Neurological Sciences, Stanford School of Medicine, Functional Imaging in Neuropsychiatric Disorders Lab, Stanford, California, 94305.
Michael D
MD
Greicius
Advanced MRI Section, Laboratory of Functional and Molecular Imaging, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland, 20892.
Catie
C
Chang
D000328:Adult; D001931:Brain Mapping; D005260:Female; D006179:Gyrus Cinguli / Q000000981:diagnostic imaging / Q000502:physiology*; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D008959:Models, Neurological; D009038:Motion; D009415:Nerve Net / Q000502:physiology*; D010100:Oxygen / Q000097:blood; D010296:Parietal Lobe / Q000000981:diagnostic imaging / Q000502:physiology*; D012044:Regression Analysis; D012146:Rest; D055815:Young Adult
D010100:Oxygen
DMN; anti-correlation; resting state; seed-dependence