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Transmodal Analysis of Neural Signals [article]

Yaroslav O. Halchenko, Michael Hanke, James V. Haxby, Stephen Jose Hanson, Christoph S. Herrmann
2013 arXiv   pre-print
of neural signals (TRANSfusion).  ...  In this paper we suggest a novel methodology which relies on constructing a quantifiable mapping of data from one modality (electroencephalography; EEG) into another (fMRI), called transmodal analysis  ...  Based on these findings, we suggest a methodology for multimodal fusion analysis -a transmodal analysis of neural signal (called TRANSfusion), which relies on constructing a reliable model to describe  ... 
arXiv:1307.2150v1 fatcat:vopamhiv3nhw5ehut3vqfbxalu

Echoes of the Brain

Rodrigo M. Braga, Robert Leech
2015 The Neuroscientist  
of signals can be simultaneously segregated and integrated within transmodal regions, and (3) enhance current network-and node-level models of brain function, by showing that non-stationary functional  ...  connectivity patterns may be a result of dynamic shifts in subnodal signals.  ...  In contrast, our analysis specifically probed for the presence of signals from whole-brain ICN.  ... 
doi:10.1177/1073858415585730 pmid:25948648 pmcid:PMC4586496 fatcat:ohxh2aunxfcnreun67auy2ozsu

A cortical hierarchy of localized and distributed processes revealed via dissociation of task activations, connectivity changes, and intrinsic timescales

Takuya Ito, Luke J. Hearne, Michael W. Cole
2020 NeuroImage  
We found that across multiple tasks, the magnitude of regional task-evoked activity was high in unimodal areas, but low in transmodal areas.  ...  In contrast, we found that task-state FC was significantly reduced in unimodal areas relative to transmodal areas.  ...  In contrast, distributed neural processing across large-scale cortical systems has typically been studied by measuring the task-state functional connectivity (FC; i.e., covariation of neural signal across  ... 
doi:10.1016/j.neuroimage.2020.117141 pmid:32663642 pmcid:PMC7779074 fatcat:hlj2if2zkjea7mg646j5t3iqee

Default mode network can support the level of detail in experience during active task states

Mladen Sormaz, Charlotte Murphy, Hao-ting Wang, Mark Hymers, Theodoros Karapanagiotidis, Giulia Poerio, Daniel S. Margulies, Elizabeth Jefferies, Jonathan Smallwood
2018 Proceedings of the National Academy of Sciences of the United States of America  
We used representational similarity analysis to examine correspondences between patterns of neural activity and each dimension of thought.  ...  Regions of transmodal cortex, in particular the default mode network (DMN), have historically been argued to serve functions unrelated to task performance, in part because of associations with naturally  ...  The DMN falls at the most extreme transmodal end of this spectrum (17) , which may enable neural signals within it to integrate signals from other brain regions, providing top-down predictions to lower  ... 
doi:10.1073/pnas.1721259115 pmid:30150393 fatcat:zmcxwlmlm5hjtj2dgylbgnikiu

Global Signal Topography of the Human Brain: A Novel Framework of Functional Connectivity for Psychological and Pathological Investigations

Yujia Ao, Yujie Ouyang, Chengxiao Yang, Yifeng Wang
2021 Frontiers in Human Neuroscience  
The global signal (GS), which was once regarded as a nuisance of functional magnetic resonance imaging, has been proven to convey valuable neural information.  ...  by the connection analysis.  ...  INTRODUCTION In fMRI studies, the global signal (GS), as the grand average of brain signals, is the largest scale of signal integration in the whole brain.  ... 
doi:10.3389/fnhum.2021.644892 pmid:33841119 pmcid:PMC8026854 fatcat:nnuz43k3fjecfnnjxchbnwz6si

Imagining Sounds and Images: Decoding the Contribution of Unimodal and Transmodal Brain Regions to Semantic Retrieval in the Absence of Meaningful Input

Charlotte Murphy, Shirley-Ann Rueschemeyer, Jonathan Smallwood, Elizabeth Jefferies
2018 Journal of Cognitive Neuroscience  
Using an fMRI decoding approach, in conjunction with functional connectivity analysis, we examined the role of primary auditory/visual cortex and transmodal brain regions.  ...  However, it remains unclear which neural systems underpin this process, and whether different types of imagery recruit similar or different neural networks.  ...  Finally, using resting-state fMRI, we characterized the intrinsic connectivity of regions identified in our MVPA analysis to understand the neural networks they are embedded in.  ... 
doi:10.1162/jocn_a_01330 pmid:30156502 fatcat:ydzinw2tjvferdomwhol5ryqli

Linking functional connectome gradient to individual creativity

Tengbin Huo, Yunman Xia, Kaixiang Zhuang, Qunlin Chen, Jiangzhou Sun, Wenjing Yang, Jiang Qiu
2022 Cerebral Cortex  
Then we correlated the individual creativity score with measures of unimodal-transmodal gradient at global-brain, subsystem, and regional level.  ...  Previous studies have suggested that the unimodal-transmodal gradient in the functional connectome may offer an overarching framework for high-order cognitions of human brain.  ...  and longitudinal cohort aiming at clarifying the genetic and neural basis of cognitions and behaviors.  ... 
doi:10.1093/cercor/bhac013 pmid:35136988 fatcat:ysy445aizbdr3az4x67uvfqvfu

Convergence of cortical types and functional motifs in the mesiotemporal lobe [article]

Casey Paquola, Oualid Benkarim, Jordan DeKraker, Sara Lariviere, Stefan Frassle, Jessica Royer, Shahin Tavakol, Sofie Louise Valk, Andrea Bernasconi, Neda Bernasconi, Ali Khan, Alan C Evans (+3 others)
2020 bioRxiv   pre-print
Variation along the long axis of the MTL was associated with differentiation between transmodal and unimodal systems, with anterior regions linked to transmodal cortex.  ...  Our findings establish a novel model of the MTL, in which its broad influence on neural function emerges through the combination micro- and macro-scale structural features.  ...  E) We repeated the analysis in D for the anterior-posterior axis, showing a strong association with the sensory-transmodal gradient.  ... 
doi:10.1101/2020.06.12.148643 fatcat:yldqtso4pvcy3o22vbackn57f4

A spatiotemporal complexity architecture of human brain activity [article]

Stephan Krohn, Nina von Schwanenflug, Leonhard Waschke, Amy Romanello, Martin Gell, Douglas D. Garrett, Carsten Finke
2021 bioRxiv   pre-print
Here we apply time-resolved estimation of brain signal complexity to uncover a unifying principle of brain organization, linking the connectome to neural variability6,28-31.  ...  hierarchy from lower-order unimodal to higher-order transmodal processing systems24-27.  ...  Following methodological considerations 56,74 and previous applications of WPE to neural data analysis 75,76 , a motif length of m = 3 and a lag parameter of τ = 1 was applied to compute the motif distribution  ... 
doi:10.1101/2021.06.04.446948 fatcat:qaeunmyhofen5infooag52owx4

A Developmental Reduction of the Excitation:Inhibition Ratio in Association Cortex during Adolescence [article]

Bart Larsen, Zaixu Cui, Azeez Adebimpe, Adam R Pines, Aaron Alexander-Bloch, Max Bertolero, Monica E Calkins, Raquel E Gur, Ruben C Gur, Arun S Mahadevan, Tyler M Moore, David R Roalf (+4 others)
2021 bioRxiv   pre-print
A reduction of the excitation:inhibition (E:I) ratio is a hallmark of critical period development; however it has been unclear how to measure the development of the E:I ratio using non-invasive neuroimaging  ...  Here, we used pharmacological fMRI with a GABAergic benzodiazepine challenge to empirically generate a model of E:I ratio based on multivariate patterns of functional connectivity.  ...  Analysis workflow.  ... 
doi:10.1101/2021.05.19.444703 fatcat:hrchfwmi4veolix7rjgn6wbkiy

Convergence of cortical types and functional motifs in the human mesiotemporal lobe

Casey Paquola, Oualid Benkarim, Jordan DeKraker, Sara Lariviere, Stefan Frässle, Jessica Royer, Shahin Tavakol, Sofie Valk, Andrea Bernasconi, Neda Bernasconi, Ali Khan, Alan C Evans (+3 others)
2020 eLife  
Moreover, while the iso-to-allocortical gradient parametrically represented the multiple-demand relative to task-negative networks, anterior-posterior gradients represented transmodal versus unimodal networks  ...  Our findings establish that the combination of micro- and macrostructural features allow the MTL to represent dominant motifs of whole-brain functional organization.  ...  trade-offs 130 between sensory and transmodal function, and iso-to-allocortical positions related to the relative 131 contribution of the multiple demand system. 132 133 Cytoarchitectural analysis of  ... 
doi:10.7554/elife.60673 pmid:33146610 pmcid:PMC7671688 fatcat:o3aaclhaqfebfmy3itajzl4pjy

Global waves synchronize the brain's functional systems with fluctuating arousal

Ryan V. Raut, Abraham Z. Snyder, Anish Mitra, Dov Yellin, Naotaka Fujii, Rafael Malach, Marcus E. Raichle
2021 Science Advances  
Last, we demonstrate similar, cortex-wide propagation of neural activity measured with electrocorticography in macaques.  ...  We show that these waves can parsimoniously account for many features of spontaneous fMRI signal fluctuations, including topographically organized functional connectivity.  ...  The equivalence between a phase shift of /2 and a time delay of ~10 s reflects that this analysis was conducted on narrowband signals centered at ~0.025 Hz.  ... 
doi:10.1126/sciadv.abf2709 pmid:34290088 fatcat:iyt3rbu54zf3dgik3xtofquu5i

Benchmarking functional connectivity by the structure and geometry of the human brain

Zhen-Qi Liu, Richard F. Betzel, Bratislav Misic
2022 Network Neuroscience  
We also find unexpectedly strong functional connectivity at the apex of the unimodal-transmodal hierarchy.  ...  These findings also potentially explain recent reports that structural and functional connectivity gradually diverge in transmodal cortex.  ...  BM acknowledges support from the Natural Sciences and Engineering Research Council of Canada (NSERC), the Canadian Institutes of Health Research (CIHR), the Canada Research Chairs Program (CRC), Brain  ... 
doi:10.1162/netn_a_00236 fatcat:ymfux6ramnhc7d5rfqjxjhp7qi

Convergence of cortical types and functional motifs in the human mesiotemporal lobe

Casey Paquola, Oualid Benkarim, Jordan DeKraker, Sara Larivière, Stefan Frässle, Jessica Royer, Shahin Tavakol, Sofie Valk, Andrea Bernasconi, Neda Bernasconi, Ali Khan, Alan C Evans (+3 others)
2020 eLife  
Moreover, while the iso-to-allocortical gradient parametrically represented the multiple-demand relative to task-negative networks, anterior-posterior gradients represented transmodal versus unimodal networks  ...  Our findings establish that the combination of micro- and macrostructural features allow the MTL to represent dominant motifs of whole-brain functional organisation.  ...  (E) We repeated the analysis in D for the anterior-posterior axis, showing a strong association with the sensory-transmodal gradient.  ... 
doi:10.7554/elife.60673 fatcat:yo6dqxnwmrdpzpnwh5cb4bfuze

Isolated from input: Evidence of default mode network support for perceptually-decoupled and conceptually-guided cognition [article]

Charlotte Murphy, Elizabeth Jefferies, Shirley-Ann Rueschemeyer, Mladen Sormaz, Hao-ting Wang, Daniel Margulies, Jonathan Smallwood
2017 bioRxiv   pre-print
This shift in the focus of neural activity towards transmodal, default mode, regions might reflect a process of isolation from specific sensory inputs that enables conceptually rich cognitive states to  ...  In a subsequent analysis, we showed that these regions were located at the extreme end of a macroscale gradient, which describes gradual transitions from sensorimotor to transmodal cortex.  ...  Using 572 both standard and novel methods of analysis, we demonstrated that the neural 573 activity associated with this type of activity is prevalent in transmodal regions 574 (Figure 5) and can be represented  ... 
doi:10.1101/150466 fatcat:aejshhlnereqfo23f32k5rhsvi
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