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https://www.readbyqxmd.com/read/28928708/neural-patterns-of-reorganization-after-intensive-robot-assisted-virtual-reality-therapy-and-repetitive-task-practice-in-patients-with-chronic-stroke
#1
Soha Saleh, Gerard Fluet, Qinyin Qiu, Alma Merians, Sergei V Adamovich, Eugene Tunik
Several approaches to rehabilitation of the hand following a stroke have emerged over the last two decades. These treatments, including repetitive task practice (RTP), robotically assisted rehabilitation and virtual rehabilitation activities, produce improvements in hand function but have yet to reinstate function to pre-stroke levels-which likely depends on developing the therapies to impact cortical reorganization in a manner that favors or supports recovery. Understanding cortical reorganization that underlies the above interventions is therefore critical to inform how such therapies can be utilized and improved and is the focus of the current investigation...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28917165/cerebellar-induced-differential-polyglot-aphasia-a-neurolinguistic-and-fmri-study
#2
Peter Mariën, Kim van Dun, Johanna Van Dormael, Dorien Vandenborre, Stefanie Keulen, Mario Manto, Jo Verhoeven, Jubin Abutalebi
Research has shown that linguistic functions in the bilingual brain are subserved by similar neural circuits as in monolinguals, but with extra-activity associated with cognitive and attentional control. Although a role for the right cerebellum in multilingual language processing has recently been acknowledged, a potential role of the left cerebellum remains largely unexplored. This paper reports the clinical and fMRI findings in a strongly right-handed (late) multilingual patient who developed differential polyglot aphasia, ataxic dysarthria and a selective decrease in executive function due to an ischemic stroke in the left cerebellum...
September 13, 2017: Brain and Language
https://www.readbyqxmd.com/read/28914232/combined-rtms-and-virtual-reality-brain-computer-interface-training-for-motor-recovery-after-stroke
#3
Nessa N Johnson, James Carey, Bradley Edelman, Alexander Doud, Andrew Grande, Kamakshi Lakshminarayan, Bin He
OBJECTIVE: Combining repetitive transcranial magnetic stimulation (rTMS) with brain-computer interface (BCI) training can address motor impairment after stroke by down-regulating exaggerated inhibition from the contralesional hemisphere and encouraging ipsilesional activation. The objective was to evaluate the efficacy of combined rTMS+BCI, compared to sham rTMS+BCI, on motor recovery after stroke in subjects with lasting motor paresis. APPROACH: Three stroke subjects approximately one year post-stroke participated in three weeks of combined rTMS (real or sham) and BCI, followed by three weeks of BCI alone...
September 15, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28900231/functional-neural-changes-associated-with-acquired-amusia-across-different-stages-of-recovery-after-stroke
#4
Aleksi J Sihvonen, Teppo Särkämö, Pablo Ripollés, Vera Leo, Jani Saunavaara, Riitta Parkkola, Antoni Rodríguez-Fornells, Seppo Soinila
Brain damage causing acquired amusia disrupts the functional music processing system, creating a unique opportunity to investigate the critical neural architectures of musical processing in the brain. In this longitudinal fMRI study of stroke patients (N = 41) with a 6-month follow-up, we used natural vocal music (sung with lyrics) and instrumental music stimuli to uncover brain activation and functional network connectivity changes associated with acquired amusia and its recovery. In the acute stage, amusic patients exhibited decreased activation in right superior temporal areas compared to non-amusic patients during instrumental music listening...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28875598/recovery-of-proprioception-in-the-upper-extremity-by-robotic-mirror-therapy-a-clinical-pilot-study-for-proof-of-concept
#5
Hyung Seok Nam, Sukgyu Koh, Jaewon Beom, Yoon Jae Kim, Jang Woo Park, Eun Sil Koh, Sun Gun Chung, Sungwan Kim
A novel robotic mirror therapy system was recently developed to provide proprioceptive stimulus to the hemiplegic arm during a mirror therapy. Validation of the robotic mirror therapy system was performed to confirm its synchronicity prior to the clinical study. The mean error angle range between the intact arm and the robot was 1.97 to 4.59 degrees. A 56-year-old male who had right middle cerebral artery infarction 11 months ago received the robotic mirror therapy for ten 30-minute sessions during 2 weeks...
October 2017: Journal of Korean Medical Science
https://www.readbyqxmd.com/read/28830824/a-structural-motor-network-correlates-with-motor-function-and-not-impairment-post-stroke
#6
Sue Peters, Katie P Wadden, Kathryn S Hayward, Jason L Neva, Angela M Auriat, Lara A Boyd
Combining structural and functional magnetic resonance imaging may provide insight into how residual motor networks contribute to motor outcomes post-stroke. The purpose of this study was to examine whether a structural motor network (SMN), generated with fMRI guided diffusion-based tractography, relates to motor function post-stroke. Twenty-seven individuals with mild to moderate upper limb impairment post stroke underwent diffusion magnetic resonance imaging. A bilateral motor network mask guided white matter tractography for each participant...
August 19, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28796033/rtms-treatments-combined-with-speech-training-for-a-conduction-aphasia-patient-a-case-report-with-mri-study
#7
Hui Zhang, Ying Chen, Ruiping Hu, Liqing Yang, Mengxing Wang, Jilei Zhang, Haifeng Lu, Yi Wu, Xiaoxia Du
RATIONALE: To date, little is known regarding the neural mechanisms of the functional recovery of language after repetitive transcranial magnetic stimulation (rTMS) in aphasia. Our aim was to investigate the mechanism that underlies rTMS and speech training in a case report. PATIENT CONCERNS AND DIAGNOSES: We report the case of a 39-year-old woman who was initially diagnosed with conduction aphasia following a left hemisphere stroke. INTERVENTIONS: The rTMS location comprised the left Broca area, and a frequency of 5 Hz for 20 min/d for 10 days during a 2-week period was used...
August 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28794972/fractional-amplitude-of-low-frequency-fluctuations-falff-in-post-stroke-depression
#8
Natalia Egorova, Michele Veldsman, Toby Cumming, Amy Brodtmann
Depression is a common outcome following stroke, associated with reduced quality of life and poorer recovery. Despite attempts to associate depression symptoms with specific lesion sites, the neural basis of post-stroke depression remains poorly understood. Resting state fMRI has provided new insights into the neural underpinnings of post-stroke depression, but has been limited to connectivity analyses exploring interregional correlations in the time-course of activity. Other aspects of resting state BOLD signal remain unexamined...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28794427/neuroimaging-biomarkers-to-associate-obesity-and-negative-emotions
#9
Bo-Yong Park, Jisu Hong, Hyunjin Park
Obesity is a serious medical condition highly associated with health problems such as diabetes, hypertension, and stroke. Obesity is highly associated with negative emotional states, but the relationship between obesity and emotional states in terms of neuroimaging has not been fully explored. We obtained 196 emotion task functional magnetic resonance imaging (t-fMRI) from the Human Connectome Project database using a sampling scheme similar to a bootstrapping approach. Brain regions were specified by automated anatomical labeling atlas and the brain activity (z-statistics) of each brain region was correlated with body mass index (BMI) values...
August 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28782545/reshaping-the-brain-after-stroke-the-effect-of-prismatic-adaptation-in-patients-with-right-brain-damage
#10
Sonia Crottaz-Herbette, Eleonora Fornari, Michael P Notter, Claire Bindschaedler, Laura Manzoni, Stephanie Clarke
Prismatic adaptation has been repeatedly reported to alleviate neglect symptoms; in normal subjects, it was shown to enhance the representation of the left visual space within the left inferior parietal cortex. Our study aimed to determine in humans whether similar compensatory mechanisms underlie the beneficial effect of prismatic adaptation in neglect. Fifteen patients with right hemispheric lesions and 11 age-matched controls underwent a prismatic adaptation session which was preceded and followed by fMRI using a visual detection task...
August 4, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28769870/altered-coupling-between-motion-related-activation-and-resting-state-brain-activity-in-the-ipsilesional-sensorimotor-cortex-after-cerebral-stroke
#11
Jianping Hu, Juan Du, Qiang Xu, Fang Yang, Fanyong Zeng, Xi-Jian Dai, Xiaoxue Liu, Guangming Lu, Zhiqiang Zhang
Functional connectivity maps using resting-state functional magnetic resonance imaging (rs-fMRI) can closely resemble task fMRI activation patterns, suggesting that resting-state brain activity may predict task-evoked activation or behavioral performance. However, this conclusion was mostly drawn upon a healthy population. It remains unclear whether the predictive ability of resting-state brain activity for task-evoked activation would change under different pathological conditions. This study investigated dynamic changes of coupling between patterns of resting-state functional connectivity (RSFC) and motion-related activation in different stages of cerebral stroke...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28767670/comparing-tms-perturbations-to-occipital-and-parietal-cortices-in-concurrent-tms-fmri-studies-methodological-considerations
#12
Joana Leitão, Axel Thielscher, Johannes Tuennerhoff, Uta Noppeney
Neglect and hemianopia are two neuropsychological syndromes that are associated with reduced awareness for visual signals in patients' contralesional hemifield. They offer the unique possibility to dissociate the contributions of retino-geniculate and retino-colliculo circuitries in visual perception. Yet, insights from patient fMRI studies are limited by heterogeneity in lesion location and extent, long-term functional reorganization and behavioural compensation after stroke. Transcranial magnetic stimulation (TMS) has therefore been proposed as a complementary method to investigate the effect of transient perturbations on functional brain organization...
2017: PloS One
https://www.readbyqxmd.com/read/28756144/blood-oxygenation-level-dependent-functional-magnetic-resonance-imaging-in-early-days-correlation-between-passive-activation-and-motor-recovery-after-unilateral-striatocapsular-cerebral-infarction
#13
Long-Jiang Zhou, Wei Wang, Yi Zhao, Chun-Feng Liu, Xin-Jiang Zhang, Zhen-Sheng Liu, Hua-Dong Li
OBJECTIVE: This study aimed to investigate the correlation between the functional magnetic resonance imaging (fMRI) pattern and the motor function recovery of an affected limb during the passive movement of the affected limb at an early stage of the striatocapsular infarction (SCI). METHODS: A total of 17 patients with an acute stage of SCI and 3 healthy volunteers as controls were included in this study. fMRI scans of passive movement were performed on the affected limbs of stroke patients within 1 week of onset...
July 26, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28736698/impact-of-automated-ica-based-denoising-of-fmri-data-in-acute-stroke-patients
#14
D Carone, R Licenik, S Suri, L Griffanti, N Filippini, J Kennedy
Different strategies have been developed using Independent Component Analysis (ICA) to automatically de-noise fMRI data, either focusing on removing only certain components (e.g. motion-ICA-AROMA, Pruim et al., 2015a) or using more complex classifiers to remove multiple types of noise components (e.g. FIX, Salimi-Khorshidi et al., 2014 Griffanti et al., 2014). However, denoising data obtained in an acute setting might prove challenging: the presence of multiple noise sources may not allow focused strategies to clean the data enough and the heterogeneity in the data may be so great to critically undermine complex approaches...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28720981/cerebral-reorganization-in-subacute-stroke-survivors-after-virtual-reality-based-training-a-preliminary-study
#15
Xiang Xiao, Qiang Lin, Wai-Leung Lo, Yu-Rong Mao, Xin-Chong Shi, Ryan S Cates, Shu-Feng Zhou, Dong-Feng Huang, Le Li
BACKGROUND: Functional magnetic resonance imaging (fMRI) is a promising method for quantifying brain recovery and investigating the intervention-induced changes in corticomotor excitability after stroke. This study aimed to evaluate cortical reorganization subsequent to virtual reality-enhanced treadmill (VRET) training in subacute stroke survivors. METHODS: Eight participants with ischemic stroke underwent VRET for 5 sections per week and for 3 weeks. fMRI was conducted to quantify the activity of selected brain regions when the subject performed ankle dorsiflexion...
2017: Behavioural Neurology
https://www.readbyqxmd.com/read/28719572/neuroimaging-correlates-of-post-stroke-aphasia-rehabilitation-in-a-pilot-randomized-trial-of-constraint-induced-aphasia-therapy
#16
Rodolphe Nenert, Jane B Allendorfer, Amber M Martin, Christi Banks, Angel Ball, Jennifer Vannest, Aimee R Dietz, Jerzy P Szaflarski
BACKGROUND Recovery from post-stroke aphasia is a long and complex process with an uncertain outcome. Various interventions have been proposed to augment the recovery, including constraint-induced aphasia therapy (CIAT). CIAT has been applied to patients suffering from post-stroke aphasia in several unblinded studies to show mild-to-moderate linguistic gains. The aim of the present study was to evaluate the neuroimaging correlates of CIAT in patients with chronic aphasia related to left middle cerebral artery stroke...
July 18, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28674515/investigating-the-blood-oxygenation-level-dependent-functional-mri-response-to-a-verbal-fluency-task-in-early-stroke-before-and-after-hemodynamic-scaling
#17
Veena A Nair, Ryan V Raut, Vivek Prabhakaran
BACKGROUND AND OBJECTIVE: Blood oxygenation level-dependent (BOLD) functional MRI (fMRI) has been extensively used as a marker of brain dysfunction and subsequent recovery following stroke. However, growing evidence suggests that straightforward interpretation of BOLD fMRI changes with aging and disease is challenging. In this study, we investigated the effect of calibrating task fMRI data by applying a hemodynamic calibration method using the resting-state fluctuation amplitude (RSFA)...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28665373/-functional-neuroimaging-of-the-brain-structures-associated-with-language-in-healthy-individuals-and-patients-with-post-stroke-aphasia
#18
V V Alferova, L A Mayorova, E G Ivanova, A B Guekht, V M Shklovskij
The introduction of non-invasive functional neuroimaging techniques such as functional magnetic resonance imaging (fMRI), in the practice of scientific and clinical research can increase our knowledge about the organization of cognitive processes, including language, in normal and reorganization of these cognitive functions in post-stroke aphasia. The article discusses the results of fMRI studies of functional organization of the cortex of a healthy adult's brain in the processing of various voice information as well as the main types of speech reorganization after post-stroke aphasia in different stroke periods...
2017: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/28652969/interindividual-differences-in-motor-network-connectivity-and-behavioral-response-to-itbs-in-stroke-patients
#19
Svenja Diekhoff-Krebs, Eva-Maria Pool, Anna-Sophia Sarfeld, Anne K Rehme, Simon B Eickhoff, Gereon R Fink, Christian Grefkes
Cerebral plasticity-inducing approaches like repetitive transcranial magnetic stimulation (rTMS) are of high interest in situations where reorganization of neural networks can be observed, e.g., after stroke. However, an increasing number of studies suggest that improvements in motor performance of the stroke-affected hand following modulation of primary motor cortex (M1) excitability by rTMS shows a high interindividual variability. We here tested the hypothesis that in stroke patients the interindividual variability of behavioral response to excitatory rTMS is related to interindividual differences in network connectivity of the stimulated region...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28594850/no-changes-in-functional-connectivity-during-motor-recovery-beyond-5-weeks-after-stroke-a-longitudinal-resting-state-fmri-study
#20
Tanja C W Nijboer, Floor E Buma, Caroline Winters, Mariska J Vansteensel, Gert Kwakkel, Nick F Ramsey, Mathijs Raemaekers
Spontaneous motor recovery after stroke appears to be associated with structural and functional changes in the motor network. The aim of the current study was to explore time-dependent changes in resting-state (rs) functional connectivity in motor-impaired stroke patients, using rs-functional MRI at 5 weeks and 26 weeks post-stroke onset. For this aim, 13 stroke patients from the EXPLICIT-stroke Trial and age and gender-matched healthy control subjects were included. Patients' synergistic motor control of the paretic upper-limb was assessed with the upper extremity section of the Fugl-Meyer Assessment (FMA-UE) within 2 weeks, and at 5 and 26 weeks post-stroke onset...
2017: PloS One
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