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Detecting Brain Activation in fMRI Using Group Random Walker [chapter]

Bernard Ng, Ghassan Hamarneh, Rafeef Abugharbieh
2010 Lecture Notes in Computer Science  
We thus propose a new graph-theoretic method, "Group Random Walker" (GRW), that integrates group information in detecting single-subject activation.  ...  correspondence as required in standard fMRI group analysis.  ...  Group Random Walker In the original RW framework, each voxel is represented as a graph vertex with weighted edges added between spatial neighbors to bias the paths for which a random walker may transverse  ... 
doi:10.1007/978-3-642-15745-5_41 fatcat:t3liobgsjjfabnezmtmlt5cpsq

Fiber Connectivity Integrated Brain Activation Detection [chapter]

Burak Yoldemir, Bernard Ng, Todd S. Woodward, Rafeef Abugharbieh
2013 Lecture Notes in Computer Science  
Inference of brain activation through the analysis of functional magnetic resonance imaging (fMRI) data is seriously confounded by the high level of noise in the observations.  ...  Further, we illustrate how our model enables the detection of significant group activation differences between controls and patients that are missed with standard methods.  ...  Detecting group activation in controls.  ... 
doi:10.1007/978-3-642-38868-2_12 pmid:24683964 fatcat:rxdjegwvpzhk3ambzohryfhg64

Dual-task walking and automaticity after Stroke: Insights from a secondary analysis and imaging sub-study of a randomised controlled trial

Johnny Collett, Melanie K Fleming, Daan Meester, Emad Al-Yahya, Derick T Wade, Andrea Dennis, Piergiorgio Salvan, Andrew Meaney, Janet Cockburn, Joanna Dawes, Heidi Johansen-Berg, Helen Dawes
2021 Clinical Rehabilitation  
and planning tasks and an fMRI sub-study used ankle-dorsiflexion to simulate walking.  ...  Results: ST walking improved in both groups (∆baseline: Good = 8.9 ± 13.4 m, limited = 5.3±8.9 m, Group × time = P < 0.151) but only the good walkers improved DT walking (∆baseline: Good = 10.4 ± 13.9  ...  We utilised fNRIS and fMRI to test for difference in brain activation between good and limited walkers and response to walking training.  ... 
doi:10.1177/02692155211017360 pmid:34053250 pmcid:PMC8524683 fatcat:5u2kq2rgnrdnjfmc4ha5kilpca

Neural changes related to motion processing in healthy aging

Stefanie C. Biehl, Melanie Andersen, Gordon D. Waiter, Karin S. Pilz
2017 Neurobiology of Aging  
Whole-brain comparisons showed increased temporal and frontal activation in the older group for low-level motion but no differences for biological motion.  ...  Brain regions related to both types of motion stimuli were evaluated and the magnitude and time courses of activation in those regions of interest were calculated.  ...  The BBSRC had no role in study design, the collection, analysis, and interpretation of the data, the writing of the report, and the decision to submit the paper for publication.  ... 
doi:10.1016/j.neurobiolaging.2017.05.018 pmid:28648917 pmcid:PMC5538346 fatcat:paloi4neb5dofmtijiozn3j4xa

Linking structural and effective brain connectivity: structurally informed Parametric Empirical Bayes (si-PEB)

Arseny A. Sokolov, Peter Zeidman, Michael Erb, Philippe Ryvlin, Marina A. Pavlova, Karl J. Friston
2018 Brain Structure and Function  
This provides definitive evidence that structural and effective connectivity depend upon each other in mediating distributed, large-scale interactions in the brain.  ...  Furthermore, this work offers novel perspectives for understanding normal brain architecture and its disintegration in clinical conditions.  ...  Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creat iveco mmons .org/licen ses/by/4.0/), which permits unrestricted use,  ... 
doi:10.1007/s00429-018-1760-8 fatcat:422vvwouynbntb7me4fzd6f5um

Structural and effective brain connectivity underlying biological motion detection

Arseny A. Sokolov, Peter Zeidman, Michael Erb, Philippe Ryvlin, Karl J. Friston, Marina A. Pavlova
2018 Proceedings of the National Academy of Sciences of the United States of America  
fMRI), we assess the cerebro-cerebellar network for processing of camouflaged point-light BM.  ...  The prevalence of a structural pathway between the FFG and STS is associated with better BM detection.  ...  The group coordinates were used to identify corresponding individual activation maxima (at P < 0.05, uncorrected), present in every participant within a maximum distance of 5 mm from the group activation  ... 
doi:10.1073/pnas.1812859115 fatcat:sffdb2tqlbbhja3edzrvdofhym

Estimation of Global and Local Complexities of Brain Networks: A Random Walks Approach [article]

Roberto C Sotero, Lazaro Sanchez-Rodriguez, Narges Moradi
2019 biorxiv/medrxiv   pre-print
The complexity of brain activity has been observed at many spatial scales and there exists increasing evidence supporting its use in differentiating between mental states and disorders.  ...  Our results suggest that the pos network is related to the information processing in the brain and should be used for functional connectivity analysis instead of the abs network as is usually done.  ...  In the case of weighted networks, such as the functional connectivity matrix representing the brain network, the routing strategy is a biased random walker, where the motion of a random walker located  ... 
doi:10.1101/733725 fatcat:7ahgqfyhsnhadoa2growrdb62y

Visual Perception in Autism Spectrum Disorder: A Review of Neuroimaging Studies

Seungwon Chung, Jung-Woo Son
2020 Journal of korean Academy of Child and Adolescent Psychiatry  
social brain network.  ...  Specifically, we examined the neural underpinnings of visual detection, motion perception, and face processing in ASD.  ...  In the first fMRI study using EFT by Ring et al. [42] , the ventral occipitotemporal regions were activated more in the ASD than in the TD group.  ... 
doi:10.5765/jkacap.200018 pmid:32665755 pmcid:PMC7350544 fatcat:pailhbvtsvhb3drukkjoojy2nu

Treadmill Exercise Activates Subcortical Neural Networks and Improves Walking After Stroke: A Randomized Controlled Trial

A. R. Luft, R. F. Macko, L. W. Forrester, F. Villagra, F. Ivey, J. D. Sorkin, J. Whitall, S. McCombe-Waller, L. Katzel, A. P. Goldberg, D. F. Hanley
2008 Stroke  
Methods-A randomized controlled trial determined the effects of 6-month T-EX (nϭ37) versus comparable duration stretching (CON, nϭ34) on walking, aerobic fitness and in a subset (nϭ15/17) on brain activation  ...  T-EX but not CON affected brain activation during paretic, but not during nonparetic limb movement, showing 72% increased activation in posterior cerebellar lobe and 18% in midbrain (PϽ0.005).  ...  Kirby Centre for Functional Brain Imaging, Kennedy Krieger Institute (Baltimore, MD, USA) for their support. Sources of Funding Disclosures None.  ... 
doi:10.1161/strokeaha.108.527531 pmid:18757284 pmcid:PMC2929142 fatcat:kkxsa2pqvnf57d73vegjhnnabi

Early Detection of Alzheimer's Disease: Detecting Asymmetries with a Return Random Walk Link Predictor

Manuel Curado, Francisco Escolano, Miguel A. Lozano, Edwin R. Hancock
2020 Entropy  
between the left and right hemispheres of the brain using a directed version of the Return Random Walk (RRW).  ...  The detection of these asymmetries is relevant to detect the disease in an early stage.  ...  Directed-RRW in fMRI Networks Using net4Lap In this paper, we demonstrate the utility of the Return Random Walk as a tool for early detection of the disease in fMRI activation networks, allowing us to  ... 
doi:10.3390/e22040465 pmid:33286239 fatcat:sscv7nxvf5ex5mitbmegi4s7gy

Visual areas involved in the perception of human movement from dynamic form analysis

Lars Michels, Markus Lappe, Lucia Maria Vaina
2005 NeuroReport  
We used the stimulus from Beintema and Lappe and compared the brain activity with a point-light display that does contain local motion information and was often used in previous studies.  ...  Here, we examine the speci¢city of brain regions responsive to a biological motion stimulus without local image motion, using functional magnetic resonance imaging.  ...  Group activation map for each contrast [classical walker (CW ), classical static walker (CS), sequential position walker (SW ) and sequential static walker (SS) vs. baseline] in two di¡erent axial slices  ... 
doi:10.1097/00001756-200507130-00002 pmid:15973144 fatcat:b7xrro2tanhhbnpuqmubisvkn4

Recruitment of Periventricular Parietal Regions in Processing Cluttered Point-Light Biological Motion

Marina Pavlova, Alexander Sokolov, Martin Staudt, Fabio Marconato, Niels Birbaumer, Ingeborg Krägeloh-Mann
2004 Cerebral Cortex  
Observers had to detect a point-light walker embedded in an array of distracters mimicking the motion of the target's dots.  ...  The functioning of this system seems to be vulnerable to bilateral periventricular damage even if it occurs very early in brain development.  ...  F.M. was a visiting student in M.P.'s laboratory.  ... 
doi:10.1093/cercor/bhh162 pmid:15319314 fatcat:c3txkjlqvjbx5nvcon7daoyvba

Temporally intermittent communities in brain fMRI correlation networks

Ulf Aslak, Søren F. V. Nielsen, Morten Mørup, Sune Lehmann
2019 Applied Network Science  
In spite of this, however, relatively little attention has been given to solving this problem using recently developed techniques for temporal community detection.  ...  In this paper, as a proof-of-concept, we apply a novel technique for community detection in temporal networks to a dataset of fMRI measurements from 100 healthy subjects undertaking a working memory task  ...  Conclusion & discussion By modeling the dynamic dependencies between brain regions in fMRI data, using a temporal network, and inferring inter-temporal dependencies in that network using the NFC principle  ... 
doi:10.1007/s41109-019-0178-4 fatcat:o46ir3tm2jav5nsadwieqaikci

Cerebellar Engagement in an Action Observation Network

A. A. Sokolov, A. Gharabaghi, M. S. Tatagiba, M. Pavlova
2009 Cerebral Cortex  
The cerebellum has traditionally been viewed as a brain structure subserving skilled motor behaviors.  ...  However, the cerebellum might be involved not only in movement coordination, but also in action observation and understanding of others' actions.  ...  To ensure that only voxels located within the brain were included in the normalization process, the SPM2 threshold template brain mask was used.  ... 
doi:10.1093/cercor/bhp117 pmid:19546157 fatcat:ecalqdi3qjbqxjexgq3ve47uhq

Brain activity for peripheral biological motion in the posterior superior temporal gyrus and the fusiform gyrus: Dependence on visual hemifield and view orientation

Lars Michels, Raimund Kleiser, Marc H.E. de Lussanet, Rüdiger J. Seitz, Markus Lappe
2009 NeuroImage  
We found activation exclusively in the right pSTG for both visual hemifields.  ...  In previous studies with foveal stimuli the activity in the pSTS/pSTG was often confined to the right hemisphere and bilateral in fusiform gyrus.  ...  S. and K.L. were supported by Brain Imaging Center West (BMBF).  ... 
doi:10.1016/j.neuroimage.2008.10.063 pmid:19063979 fatcat:yvb4sws435gd5msctjxigyh464
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