scholarly journals Sparse Representation-Based Denoising for High-Resolution Brain Activation and Functional Connectivity Modeling: A Task fMRI Study

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 36728-36740 ◽  
Author(s):  
Seongah Jeong ◽  
Xiang Li ◽  
Jiarui Yang ◽  
Quanzheng Li ◽  
Vahid Tarokh
Keyword(s):  
High Resolution ◽  
Functional Connectivity ◽  
Sparse Representation ◽  
Brain Activation ◽  
Fmri Study ◽  
Connectivity Modeling

scholarly journals Brain activation and hypothalamic functional connectivity during human non-rapid eye movement sleep: an EEG/fMRI study

Brain ◽  
2005 ◽  
Vol 129 (3) ◽  
pp. 655-667 ◽  
Author(s):  
C. Kaufmann ◽  
R. Wehrle ◽  
T. C. Wetter ◽  
F. Holsboer ◽  
D. P. Auer ◽  
...  
Keyword(s):  
Functional Connectivity ◽  
Eye Movement ◽  
Brain Activation ◽  
Rapid Eye Movement ◽  
Rapid Eye Movement Sleep ◽  
Fmri Study

Brain activation and functional connectivity during Chinese writing: An fMRI study

2019 ◽  
Vol 51 ◽  
pp. 199-211 ◽  
Author(s):  
Yang Yang ◽  
Zhentao Zuo ◽  
Fred Tam ◽  
Simon J. Graham ◽  
Ran Tao ◽  
...  
Keyword(s):  
Functional Connectivity ◽  
Brain Activation ◽  
Fmri Study ◽  
Chinese Writing

scholarly journals Pansharpening of WorldView-2 Data via Graph Regularized Sparse Coding and Adaptive Coupled Dictionary

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3586
Author(s):  
Wenqing Wang ◽  
Han Liu ◽  
Guo Xie
Keyword(s):  
High Resolution ◽  
Sparse Representation ◽  
Sparse Coding ◽  
Spectral Response ◽  
Objective Evaluation ◽  
Coefficient Matrix ◽  
Image Patch ◽  
Subjective Analysis ◽  
High Resolution Image ◽  
Sparse Coefficient

The spectral mismatch between a multispectral (MS) image and its corresponding panchromatic (PAN) image affects the pansharpening quality, especially for WorldView-2 data. To handle this problem, a pansharpening method based on graph regularized sparse coding (GRSC) and adaptive coupled dictionary is proposed in this paper. Firstly, the pansharpening process is divided into three tasks according to the degree of correlation among the MS and PAN channels and the relative spectral response of WorldView-2 sensor. Then, for each task, the image patch set from the MS channels is clustered into several subsets, and the sparse representation of each subset is estimated through the GRSC algorithm. Besides, an adaptive coupled dictionary pair for each task is constructed to effectively represent the subsets. Finally, the high-resolution image subsets for each task are obtained by multiplying the estimated sparse coefficient matrix by the corresponding dictionary. A variety of experiments are conducted on the WorldView-2 data, and the experimental results demonstrate that the proposed method achieves better performance than the existing pansharpening algorithms in both subjective analysis and objective evaluation.

scholarly journals The long-term associations between parental behaviors, cognitive function and brain activation in adolescence

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Orwa Dandash ◽  
Nicolas Cherbuin ◽  
Orli Schwartz ◽  
Nicholas B. Allen ◽  
Sarah Whittle
Keyword(s):  
Cognitive Performance ◽  
Early Adolescence ◽  
Maternal Behavior ◽  
Cognitive Abilities ◽  
Brain Activation ◽  
Late Adolescence ◽  
Parenting Behavior ◽  
Vital Role ◽  
Childhood And Adolescence ◽  
Fmri Study

AbstractParenting behavior has a vital role in the development of the brain and cognitive abilities of offspring throughout childhood and adolescence. While positive and aggressive parenting behavior have been suggested to impact neurobiology in the form of abnormal brain activation in adolescents, little work has investigated the links between parenting behavior and the neurobiological correlates of cognitive performance during this age period. In the current longitudinal fMRI study, associations between parenting behaviors and cognitive performance and brain activation across mid- and late-adolescence were assessed. Observed measures of maternal aggressive and positive behavior were recorded in early adolescence (12 years) and correlated with fMRI activation and in-scanner behavioral scores on the multi-source interference task (MSIT) during mid- (16 years; 95 participants) and late-adolescence (19 years; 75 participants). There was a significant reduction in inhibitory-control-related brain activation in posterior parietal and cingulate cortices as participants transitioned from mid- to late-adolescence. Positive maternal behavior in early-adolescence was associated with lower activation in the left parietal and DLPFC during the MSIT in mid-adolescence, whereas maternal aggressive behavior was associated with longer reaction time to incongruent trials in late-adolescence. The study supports the notion that maternal behavior may influence subsequent neurocognitive development during adolescence.

scholarly journals Brain Activation during Thoughts of One’s Own Death and Its Linear and Curvilinear Correlations with Fear of Death in Elderly Individuals: An fMRI Study

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Kanan Hirano ◽  
Kentaro Oba ◽  
Toshiki Saito ◽  
Shohei Yamazaki ◽  
Ryuta Kawashima ◽  
...  
Keyword(s):  
Brain Activation ◽  
Posterior Cingulate Cortex ◽  
Fear Of Death ◽  
Supramarginal Gyrus ◽  
Brain Responses ◽  
Fmri Study ◽  
Negative Linear Correlation ◽  
The Right ◽  
Older Populations ◽  
Existential Issues

Abstract Facing one’s own death and managing the fear of death are important existential issues, particularly in older populations. Although recent functional magnetic resonance imaging (fMRI) studies have investigated brain responses to death-related stimuli, none has examined whether this brain activation was specific to one’s own death or how it was related to dispositional fear of death. In this study, during fMRI, 34 elderly participants (aged, 60–72 years) were presented with either death-related or death-unrelated negative words and asked to evaluate the relevance of these words to the “self” or the “other.” The results showed that only the left supplementary motor area (SMA) was selectively activated during self-relevant judgments of death-related words. Regression analyses of the effect of fear of death on brain activation during death-related thoughts identified a significant negative linear correlation in the right supramarginal gyrus (SMG) and an inverted-U-shaped correlation in the posterior cingulate cortex (PCC) only during self-relevant judgments. Our results suggest potential involvement of the SMA in the existential aspect of thoughts of death. The distinct fear-of-death-dependent responses in the SMG and PCC may reflect fear-associated distancing of the physical self and the processing of death-related thoughts as a self-relevant future agenda, respectively.

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