Filters








260 Hits in 8.7 sec

Head-repositioning does not reduce the reproducibility of fMRI activation in a block-design motor task

David A. Soltysik, David Thomasson, Sunder Rajan, Javier Gonzalez-Castillo, Paul DiCamillo, Nadia Biassou
2011 NeuroImage  
Head-repositioning does not reduce the reproducibility of fMRI activation in a block-design motor task Citation:  ...  Head-repositioning does not reduce the reproducibility of fMRI activation in a block-design motor task. Neuroimage. 2011 June 1; 56(3): 1329-1337.  ...  Soltysik had been tasked with examining the feasibility of fMRI to be used as a biomarker • Investigation to support this possibility included looking at reproducibility in fMRI head-repositioning • Nine  ... 
doi:10.1016/j.neuroimage.2011.03.023 pmid:21406235 pmcid:PMC3085718 fatcat:6lrc56xryncujkvnxzxar56ngy

Test–retest variability underlying fMRI measurements

M. Raemaekers, S. du Plessis, N.F. Ramsey, J.M.H. Weusten, M. Vink
2012 NeuroImage  
The mean between-session differences in the amplitude of activation across the whole brain were 13.8% for the visual task and 23.4% for the motor inhibition task.  ...  Methods: In this test-retest study, subjects were scanned twice with one week apart, while performing a visual and a motor inhibition task.  ...  Note however that a recent study did not find an effect of head repositioning in the scanner on reliability of fMRI measurements (Soltysik et al., 2011) , but large differences in analysis techniques  ... 
doi:10.1016/j.neuroimage.2011.11.061 pmid:22155027 fatcat:ahlm43lffjeepgvc2i6h5ycdje

Functional Imaging Reveals Movement Preparatory Activity in the Vegetative State

Tristan Andres Bekinschtein, Facundo Francisco Manes, Mirta Villarreal, Adrian Mark Owen, Valeria Della-Maggiore
2011 Frontiers in Human Neuroscience  
From a methodological point of view, the innovation of this paradigm lies in the use of a simple motor task that does not require high-level cognitive processing and therefore could be used to detect conscious  ...  He also occasionally groaned when repositioned in the bed or during blood extractions but this behavior was not reproducible.  ... 
doi:10.3389/fnhum.2011.00005 pmid:21441977 pmcid:PMC3031991 fatcat:srs2etxpefbvveavtwwdpmwhty

Targeted brain activation using an MR-compatible wrist torque measurement device and isometric motor tasks during functional magnetic resonance imaging

Martijn P. Vlaar, Winfred Mugge, Paul F.C. Groot, Sarvi Sharifi, Lo J. Bour, Frans C.T. van der Helm, Anne-Fleur van Rootselaar, Alfred C. Schouten
2016 Magnetic Resonance Imaging  
This study shows that specific pairs of motor tasks using the wrist and simple MRcompatible equipment allow for targeted activation of CBL and BG and paves the way for more extensive research and eventually  ...  Increased activity in the CBL was found during a constant torque task with visual feedback with an added visual error compared to a constant torque task with normal visual feedback.  ...  Acknowledgements This research was conducted within the context of the Movement Diagnostic System project, which is a collaboration between the Academic Medical Centre (University of Amsterdam), Technical  ... 
doi:10.1016/j.mri.2016.02.002 pmid:26968144 fatcat:slsuevuqo5cafaiu42kb6vy3gy

Correcting dynamic distortions in 7T echo planar imaging using a jittered echo time sequence

Barbara Dymerska, Benedikt A. Poser, Wolfgang Bogner, Eelke Visser, Korbinian Eckstein, Pedro Cardoso, Markus Barth, Siegfried Trattnig, Simon D. Robinson
2015 Magnetic Resonance in Medicine  
Our approach reduced the distortions in activated regions to <1 mm and repositioned active voxels correctly. Conclusion: This method yields accurate distortion correction in the presence of motion.  ...  The method was tested in functional MRI experiments at 7T with motor tasks and compared with the conventional static approach.  ...  Experiment 4: Evaluation of the Performance of Jittered-TE DDC in a Block Design fMRI Task Jittered-TE EPI (with the same parameters as in experiment 3) was compared with a standard single echo EPI (TE  ... 
doi:10.1002/mrm.26018 pmid:26584148 pmcid:PMC5082535 fatcat:phhelupocrfsjikfn2xx6rjjcu

A mechanical mounting system for functional near-infrared spectroscopy brain imaging studies

Shirley Coyle, Charles Markham, William Lanigan, Tomas Ward, Hugh J. Byrne, Elfed Lewis, Brian D. MacCraith, Enda McGlynn, James A. McLaughlin, Gerard D. O'Sullivan, Alan G. Ryder, James E. Walsh
2005 Opto-Ireland 2005: Optical Sensing and Spectroscopy  
Our optical BCI detects characteristic changes in the cerebral haemodynamic responses that occur during motor imagery tasks.  ...  While signal processing has a large part to play in terms of optimising performance we have found that it is the mechanical mounting of the optical sources and detectors (optodes) that has the greatest  ...  must traverse an area activated by the a) experimental task.  ... 
doi:10.1117/12.604823 fatcat:bweihyvvr5bzjgcz5luxf4nl74

Magnetic Resonance–Compatible Robotic and Mechatronics Systems for Image-Guided Interventions and Rehabilitation: A Review Study

Nikolaos V. Tsekos, Azadeh Khanicheh, Eftychios Christoforou, Constantinos Mavroidis
2007 Annual Review of Biomedical Engineering  
Dedicated robotic interfaces used in conjunction with fMRI allow neuroscientists to investigate the brain mechanisms of manipulation and motor learning, as well as to improve rehabilitation therapies.  ...  The continuous technological progress of magnetic resonance imaging (MRI), as well as its widespread clinical use as a highly sensitive tool in diagnostics and advanced brain research, has brought a high  ...  often guides clinicians may not be reproducible by a motorized system.  ... 
doi:10.1146/annurev.bioeng.9.121806.160642 pmid:17439358 fatcat:q76gfrkrbfarxlfujbhr3qgu64

Variance decomposition for single-subject task-based fMRI activity estimates across many sessions

Javier Gonzalez-Castillo, Gang Chen, Thomas E. Nichols, Peter A. Bandettini
2017 NeuroImage  
of task responses in fMRI.  ...  A B S T R A C T Here we report an exploratory within-subject variance decomposition analysis conducted on a task-based fMRI dataset with an unusually large number of repeated measures (i.e., 500 trials  ...  The research and writing of the paper were also supported by the NIMH and NINDS Intramural Research Programs (ZICMH002888) of the NIH/HHS, USA.  ... 
doi:10.1016/j.neuroimage.2016.10.024 pmid:27773827 pmcid:PMC5398961 fatcat:k2fftthprredtfnofi5ppbhnle

A Platform for Brain-Wide Functional Ultrasound Imaging and Analysis of Circuit Dynamics in Behaving Mice

Clément Brunner, Micheline Grillet, Arnau Sans-Dublanc, Karl Farrow, Théo Lambert, Emilie Mace, Gabriel Montaldo, Alan Urban
2020 Social Science Research Network  
Moreover, we revealed the sequential activation of sensory-motor regions during a grasping water droplet task. vfUSI will become a key neuroimaging technology because it combines ease of use, reliability  ...  Here we describe vfUSI, a platform for brain-wide volumetric functional ultrasound imaging of hemodynamic activity in awake head-fixed mice.  ...  FIGURE TITLES AND LEGENDS Figure 5. vfUSI during a sensory-motor task. (A) Schematic representation of the experimental design for vfUSI in head-fixed mice performing a reach to grasp droplet task.  ... 
doi:10.2139/ssrn.3581369 fatcat:wtrbkkfrljbmlpn4z3btgu3hoe

A platform for brain-wide functional ultrasound imaging and analysis of circuit dynamics in behaving mice [article]

Clément BRUNNER, Micheline GRILLET, Arnau SANS-DUBLANC, Karl FARROW, Théo LAMBERT, Émilie MACÉ, Gabriel MONTALDO, Alan URBAN
2020 bioRxiv   pre-print
Moreover, we revealed the sequential activation of sensory-motor regions during a grasping water droplet task. vfUSI will become a key neuroimaging technology because it combines ease of use, reliability  ...  Here we describe vfUSI, a platform for brain-wide volumetric functional ultrasound imaging of hemodynamic activity in awake head-fixed mice.  ...  Figure 5. vfUSI during a sensory-motor task. (A) Schematic representation of the experimental design for vfUSI in head-fixed mice performing a reach to grasp droplet task.  ... 
doi:10.1101/2020.04.10.035436 fatcat:efjwtxhdevbs3j24qlkmrz7inq

Modeling & Analysis

2003 NeuroImage  
Preliminary results from a analogous study of an event-related motor paradigm suggest that 1/n does not fit the empirical data as well as the block data.  ...  as a function of the number of motor blocks included in the analysis.  ...  The number of activated pixels in the whole brain and in predefined ROI (M1 and SMA), as well as the associated percentage of signal change, increased as a function of force.  ... 
doi:10.1016/s1053-8119(05)70006-9 fatcat:zff2suxcofbxvetfrwfwcxi3zm

Transcranial Magnetic Stimulation and Neuroimaging Coregistration [chapter]

Elias P., Vincenza Tarantino, Demis Basso, Patrizia S.
2013 Novel Frontiers of Advanced Neuroimaging  
The correlational nature of neuroimaging techniques does not allow any conclusion about the causal role of an activated brain region in task performance.  ...  Alternatively, if the experimental design does not allow the use of earplugs, some authors have created a control condition to isolate and exclude the auditory artefacts (e.g., [64] ).  ... 
doi:10.5772/50076 fatcat:fzqi63x4zffftabgctg52637g4

In vivo widefield calcium imaging of the mouse cortex for analysis of network connectivity in health and brain disease [article]

Julia Verena Cramer, Benno Gesierich, Stefan Roth, Martin Dichgans, Marco Duering, Arthur Liesz
2018 bioRxiv   pre-print
To explore this novel approach in a model of focal brain injury, we induced photothrombotic lesions of the motor cortex, determined changes in inter- and intrahemispheric connectivity at multiple time  ...  We observed a severe loss in interhemispheric connectivity after stroke, which was partially restored in the chronic phase and associated with corresponding behavioral motor deficits.  ...  This work was supported by the Excellence cluster of the German research foundation "Munich Cluster for Systems Neurology (SyNergy)" and the German Research foundation (DFG, LI-2534/2-1 to A.L. & DU 1626  ... 
doi:10.1101/459941 fatcat:lfrhulfigzcyfmhzzej4zvjgfu

Neural Circuits Underlying Imitation Learning of Hand Actions

Giovanni Buccino, Stefan Vogt, Afra Ritzl, Gereon R Fink, Karl Zilles, Hans-Joachim Freund, Giacomo Rizzolatti
2004 Neuron  
In a further block of six imitation ment.  ...  Insight, however, into the possible of IFG, one of the key regions of the mirror neuron system, is activated more strongly in the case of an imitative motor act (finger lifting) than when the same motor  ...  The use of an event-related fMRI design allowed us to analyze the found an activation of the supramarginal gyrus, particularly strong when a meaningless hand posture was con-temporal progression of activations  ... 
doi:10.1016/s0896-6273(04)00181-3 pmid:15091346 fatcat:ftcgfqpl6vdwvoftd3ad2hps2m

In contrast to BOLD: signal enhancement by extravascular water protons as an alternative mechanism of endogenous fMRI signal change

Chase R. Figley, Jordan K. Leitch, Patrick W. Stroman
2010 Magnetic Resonance Imaging  
Based on these findings, we concluded that cord motion is likely to be a significant source of error in spinal fMRI throughout superior, but not inferior, cord regions.  ...  General Abstract Functional magnetic resonance imaging (fMRI) has become a widely used technique for non-invasive brain mapping, and methods have now evolved to allow fMRI of the spinal cord (spinal fMRI  ...  To date, T 2 * -weighted BOLD fMRI responses have been characterized in the cervical spinal cord during blocks of a bulb-squeezing motor task (Giulietti et al., 2008) .  ... 
doi:10.1016/j.mri.2010.01.005 pmid:20299173 fatcat:tnwldgkgc5dfxdadzmhsmjuqgu
« Previous Showing results 1 — 15 out of 260 results