scholarly journals Functional Connectivity during Resting-State Functional MR Imaging: Study of the Correspondence between Independent Component Analysis and Region-of-Interest−Based Methods

2011 ◽  
Vol 33 (1) ◽  
pp. 180-187 ◽  
Author(s):  
C. Rosazza ◽  
L. Minati ◽  
F. Ghielmetti ◽  
M.L. Mandelli ◽  
M.G. Bruzzone
Keyword(s):  
Functional Connectivity ◽  
Mr Imaging ◽  
Independent Component Analysis ◽  
Resting State ◽  
Region Of Interest ◽  
Imaging Study ◽  
Component Analysis ◽  
Independent Component ◽  
Functional Mr Imaging

Independent component analysis applied to self-paced functional MR imaging paradigms

NeuroImage ◽  
2005 ◽  
Vol 25 (1) ◽  
pp. 181-192 ◽  
Author(s):  
Chad H. Moritz ◽  
John D. Carew ◽  
Alan B. McMillan ◽  
M. Elizabeth Meyerand
Keyword(s):  
Mr Imaging ◽  
Independent Component Analysis ◽  
Component Analysis ◽  
Independent Component ◽  
Functional Mr Imaging

Functional connectivity as revealed by independent component analysis of resting-state fNIRS measurements

NeuroImage ◽  
2010 ◽  
Vol 51 (3) ◽  
pp. 1150-1161 ◽  
Author(s):  
Han Zhang ◽  
Yu-Jin Zhang ◽  
Chun-Ming Lu ◽  
Shuang-Ye Ma ◽  
Yu-Feng Zang ◽  
...  
Keyword(s):  
Functional Connectivity ◽  
Independent Component Analysis ◽  
Resting State ◽  
Component Analysis ◽  
Independent Component

scholarly journals Abnormal Large-Scale Network Activation Present in Bipolar Mania and Bipolar Depression Under Resting State

2021 ◽  
Vol 12 ◽  
Author(s):  
Can Zeng ◽  
Brendan Ross ◽  
Zhimin Xue ◽  
Xiaojun Huang ◽  
Guowei Wu ◽  
...  
Keyword(s):  
Functional Connectivity ◽  
Independent Component Analysis ◽  
Resting State ◽  
Rating Scale ◽  
Bipolar Depression ◽  
Component Analysis ◽  
Independent Component ◽  
Frontoparietal Network ◽  
Bipolar Mania ◽  
Group Independent Component Analysis

Introduction: Previous studies have primarily focused on the neuropathological mechanisms of the emotional circuit present in bipolar mania and bipolar depression. Recent studies applying resting-state functional magnetic resonance imaging (fMRI) have raise the possibility of examining brain-wide networks abnormality between the two oppositional emotion states, thus this study aimed to characterize the different functional architecture represented in mania and depression by employing group-independent component analysis (gICA).Materials and Methods: Forty-one bipolar depressive patients, 20 bipolar manic patients, and 40 healthy controls (HCs) were recruited and received resting-state fMRI scans. Group-independent component analysis was applied to the brain network functional connectivity analysis. Then, we calculated the correlation between the value of between-group differences and clinical variables.Results: Group-independent component analysis identified 15 components in all subjects, and ANOVA showed that functional connectivity (FC) differed significantly in the default mode network, central executive network, and frontoparietal network across the three groups. Further post-hoc t-tests showed a gradient descent of activity—depression > HC > mania—in all three networks, with the differences between depression and HCs, as well as between depression and mania, surviving after family wise error (FWE) correction. Moreover, central executive network and frontoparietal network activities were positively correlated with Hamilton depression rating scale (HAMD) scores and negatively correlated with Young manic rating scale (YMRS) scores.Conclusions: Three brain networks heighten activity in depression, but not mania; and the discrepancy regions mainly located in prefrontal, which may imply that the differences in cognition and emotion between the two states is associated with top–down regulation in task-independent networks.

Inflammation is correlated with abnormal functional connectivity in unmedicated bipolar depression: an independent component analysis study of resting-state fMRI

2021 ◽  
pp. 1-11
Author(s):  
Guixian Tang ◽  
Pan Chen ◽  
Guanmao Chen ◽  
Shuming Zhong ◽  
JiaYing Gong ◽  
...  
Keyword(s):  
Functional Connectivity ◽  
Independent Component Analysis ◽  
Resting State ◽  
Bipolar Depression ◽  
Serum Levels ◽  
Resting State Fmri ◽  
Component Analysis ◽  
Independent Component ◽  
Precentral Gyrus ◽  
The Right

Abstract Background Inflammation might play a role in bipolar disorder (BD), but it remains unclear the relationship between inflammation and brain structural and functional abnormalities in patients with BD. In this study, we focused on the alterations of functional connectivity (FC), peripheral pro-inflammatory cytokines and their correlations to investigate the role of inflammation in FC in BD depression. Methods In this study, 42 unmedicated patients with BD II depression and 62 healthy controls (HCs) were enrolled. Resting-state-functional magnetic resonance imaging was performed in all participants and independent component analysis was used. Serum levels of Interleukin-6 (IL-6) and Interleukin-8 (IL-8) were measured in all participants. Correlation between FC values and IL-6 and IL-8 levels in BD was calculated. Results Compared with the HCs, BD II patients showed decreased FC in the left orbitofrontal cortex (OFC) implicating the limbic network and the right precentral gyrus implicating the somatomotor network. BD II showed increased IL-6 (p = 0.039), IL-8 (p = 0.002) levels. Moreover, abnormal FC in the right precentral gyrus were inversely correlated with the IL-8 (r = −0.458, p = 0.004) levels in BD II. No significant correlation was found between FC in the left OFC and cytokines levels. Conclusions Our findings that serum IL-8 levels are associated with impaired FC in the right precentral gyrus in BD II patients suggest that inflammation might play a crucial role in brain functional abnormalities in BD.

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