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fMRI stroke cognitive impairment

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https://www.readbyqxmd.com/read/27859982/transcranial-direct-current-stimulation-effects-on-neural-processing-in-post-stroke-aphasia
#1
Robert Darkow, Andrew Martin, Anna Würtz, Agnes Flöel, Marcus Meinzer
Non-invasive transcranial direct current stimulation (tDCS) can enhance recovery after stroke. However, fundamental knowledge about how tDCS impacts neural processing in the lesioned human brain is currently lacking. In the present study, it was investigated how tDCS modulates brain function in patients with post-stroke language impairment (aphasia). In a cross-over, randomized trial, patients named pictures of common objects during functional magnetic resonance imaging (fMRI). Concurrently, excitatory (anodal-) or sham-tDCS (1 mA, 20 min, or 30 s, respectively) was administered to the left primary motor cortex, a montage with demonstrated potential to improve aphasic language...
November 11, 2016: Human Brain Mapping
https://www.readbyqxmd.com/read/26286548/the-effect-of-computer-based-cognitive-flexibility-training-on-recovery-of-executive-function-after-stroke-rationale-design-and-methods-of-the-tapass-study
#2
RANDOMIZED CONTROLLED TRIAL
Renate M van de Ven, Ben Schmand, Erny Groet, Dick J Veltman, Jaap M J Murre
BACKGROUND: Stroke survivors frequently suffer from executive impairments even in the chronic phase after stroke, and there is a need for improved rehabilitation of these functions. One way of improving current rehabilitation treatment may be by online cognitive training. Based on a review of the effectiveness of computer-based cognitive training in healthy elderly, we concluded that cognitive flexibility may be a key element for an effective training, which results in improvements not merely on trained tasks but also in untrained tasks (i...
August 20, 2015: BMC Neurology
https://www.readbyqxmd.com/read/26222988/cognitive-state-following-mild-stroke-a-matter-of-hippocampal-mean-diffusivity
#3
Efrat Kliper, Einor Ben Assayag, Amos D Korczyn, Eitan Auriel, Ludmila Shopin, Hen Hallevi, Shani Shenhar-Tsarfaty, Anat Mike, Moran Artzi, Ilana Klovatch, Natan M Bornstein, Dafna Ben Bashat
The hippocampus is known to play a vital role in learning and memory and was demonstrated as an early imaging marker for Alzheimer's disease (AD). However, its role as a predictor for mild cognitive impairment and dementia following stroke is unclear. The main purpose of this study was to examine the associations between hippocampal volume, mean diffusivity (MD) and connectivity and cognitive state following stroke. Eighty three consecutive first ever mild to moderate stroke or transient ischemic attack (TIA) survivors from our ongoing prospective TABASCO (Tel Aviv Brain Acute Stroke Cohort) study underwent magnetic resonance imaging scans within 7 days of stroke onset...
February 2016: Hippocampus
https://www.readbyqxmd.com/read/26194195/a-multimodal-neuroimaging-study-of-a-case-of-crossed-nonfluent-agrammatic-primary-progressive-aphasia
#4
Edoardo G Spinelli, Francesca Caso, Federica Agosta, Giuseppe Gambina, Giuseppe Magnani, Elisa Canu, Valeria Blasi, Daniela Perani, Giancarlo Comi, Andrea Falini, Maria Luisa Gorno-Tempini, Massimo Filippi
Crossed aphasia has been reported mainly as post-stroke aphasia resulting from brain damage ipsilateral to the dominant right hand. Here, we described a case of a crossed nonfluent/agrammatic primary progressive aphasia (nfvPPA), who developed a corticobasal syndrome (CBS). We collected clinical, cognitive, and neuroimaging data for four consecutive years from a 55-year-old right-handed lady (JV) presenting with speech disturbances. 18-fluorodeoxyglucose positron emission tomography ((18)F-FDG PET) and DaT-scan with (123)I-Ioflupane were obtained...
October 2015: Journal of Neurology
https://www.readbyqxmd.com/read/26185182/stroke-and-neurodegeneration-induce-different-connectivity-aberrations-in-the-insula
#5
Indira García-Cordero, Lucas Sedeño, Daniel Fraiman, Damian Craiem, Laura Alethia de la Fuente, Paula Salamone, Cecilia Serrano, Luciano Sposato, Facundo Manes, Agustín Ibañez
BACKGROUND AND PURPOSE: Stroke and neurodegeneration cause significant brain damage and cognitive impairment, especially if the insular cortex is compromised. This study explores for the first time whether these 2 causes differentially alter connectivity patterns in the insular cortex. METHODS: Resting state-functional magnetic resonance imaging data were collected from patients with insular stroke, patients with behavioral variant frontotemporal dementia, and healthy controls...
September 2015: Stroke; a Journal of Cerebral Circulation
https://www.readbyqxmd.com/read/25852976/functional-cortical-and-cerebellar-reorganization-in-a-case-of-moyamoya-disease
#6
Rocco S Calabrò, Placido Bramanti, Annalisa Baglieri, Francesco Corallo, Rosaria De Luca, Simona De Salvo, Silvia Marino
BACKGROUND: Functional studies have been previous reported in stroke patients, but no studies of functional magnetic resonance imaging have been performed in Moyamoya disease. OBJECTIVE: To assess the cortical and cerebellar reorganization in a moyamoya patient. METHODS: We reported a case of a patient suffering from moyamoya disease, undergoing a neuropsychological assessment, a neurocognitive rehabilitative treatment, an electroencephalogram evaluation, and a functional magnetic resonance imaging examination...
January 2015: Innovations in Clinical Neuroscience
https://www.readbyqxmd.com/read/25747530/functional-connectivity-of-parietal-cortex-during-temporal-selective-attention
#7
Sarah C Tyler, Samhita Dasgupta, Sara Agosta, Lorella Battelli, Emily D Grossman
Perception of natural experiences requires allocation of attention towards features, objects, and events that are moving and changing over time. This allocation of attention is controlled by large-scale brain networks that, when damaged, cause widespread cognitive deficits. In particular, damage to ventral parietal cortex (right lateralized TPJ, STS, supramarginal and angular gyri) is associated with failures to selectively attend to and isolate features embedded within rapidly changing visual sequences (Battelli, Pascual-Leone, & Cavanagh, 2007; Husain, Shapiro, Martin, & Kennard, 1997)...
April 2015: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/25518120/-development-of-researches-on-acupuncture-stimulation-induced-regulatory-effect-under-pathological-state-based-on-resting-state-functional-magnetic-resonance-technology
#8
REVIEW
Mai-lan Liu, Xiao-rong Chang, Yi-qin Yuan
Using keywords of "acupuncture, fMRI and resting state", authors of the present paper retrieved papers in both Chinese and English from CNKI and PubMed databases without time limitation. A total of 13 articles (11 for acupuncture and 2 for moxibustion) met the standards were subjected to analysis. Of the 13 papers, 6 involve acupuncture analgesia, 2 moxibustion analgesia, 3 mild cognitive impairment, one involves stroke, and the rest one is for depression. Research results of acupuncture analgesia revealed that the analgesic effect is closely related to its regulation on "pain matrix" brain regions and pain-related default mode network...
October 2014: Zhen Ci Yan Jiu, Acupuncture Research
https://www.readbyqxmd.com/read/25217302/white-matter-tracts-of-speech-and-language
#9
REVIEW
Marion Smits, Lize C Jiskoot, Janne M Papma
Diffusion tensor imaging (DTI) has been used to investigate the white matter (WM) tracts underlying the perisylvian cortical regions known to be associated with language function. The arcuate fasciculus is composed of 3 segments (1 long and 2 short) whose separate functions correlate with traditional models of conductive and transcortical motor or sensory aphasia, respectively. DTI mapping of language fibers is useful in presurgical planning for patients with dominant hemisphere tumors, particularly when combined with functional magnetic resonance imaging...
October 2014: Seminars in Ultrasound, CT, and MR
https://www.readbyqxmd.com/read/24931140/significance-of-longitudinal-changes-in-the-default-mode-network-for-cognitive-recovery-after-stroke
#10
Ji-Young Park, Yun-Hee Kim, Won Hyuk Chang, Chang-hyun Park, Yong-Il Shin, Sung Tae Kim, Alvaro Pascual-Leone
Although a considerable number of patients suffer from cognitive impairments after stroke, the neural mechanism of cognitive recovery has not yet been clarified. Repeated resting-state functional magnetic resonance imaging (fMRI) was used in this study to examine longitudinal changes in the default-mode network (DMN) during the 6 months after stroke, and to investigate the relationship between DMN changes and cognitive recovery. Out of 24 initially recruited right-hemispheric stroke patients, 11 (eight males, mean age 55...
August 2014: European Journal of Neuroscience
https://www.readbyqxmd.com/read/24860452/changes-of-functional-connectivity-in-the-left-frontoparietal-network-following-aphasic-stroke
#11
Dan Zhu, Jingling Chang, Sonya Freeman, Zhongjian Tan, Juan Xiao, Ying Gao, Jian Kong
Language is an essential higher cognitive function supported by large-scale brain networks. In this study, we investigated functional connectivity changes in the left frontoparietal network (LFPN), a language-cognition related brain network in aphasic patients. We enrolled 13 aphasic patients who had undergone a stroke in the left hemisphere and age-, gender-, educational level-matched controls and analyzed the data by integrating independent component analysis (ICA) with a network connectivity analysis method...
2014: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/24722262/analysis-of-central-mechanism-of-cognitive-training-on-cognitive-impairment-after-stroke-resting-state-functional-magnetic-resonance-imaging-study
#12
RANDOMIZED CONTROLLED TRIAL
Zhi-cheng Lin, Jing Tao, Yan-lin Gao, Da-zhi Yin, A-zhen Chen, Li-dian Chen
OBJECTIVE: To investigate the central mechanism of cognitive training in patients with stroke, using resting state (RS) functional magnetic resonance imaging (fMRI). METHODS: Patients with stroke and executive function and memory deficit were randomized to receive computer-assisted cognitive training (treatment group; total 60 h training over 10 weeks) or no training (control group). All participants received neuropsychological assessment and RS fMRI at baseline and 10 weeks...
June 2014: Journal of International Medical Research
https://www.readbyqxmd.com/read/23395830/neuropsychological-evidence-for-the-functional-role-of-the-uncinate-fasciculus-in-semantic-control
#13
Denise Y Harvey, Tao Wei, Timothy M Ellmore, A Cris Hamilton, Tatiana T Schnur
Understanding a word requires mapping sounds to a word-form and then identifying its correct meaning, which in some cases necessitates the recruitment of cognitive control processes to direct the activation of semantic knowledge in a task appropriate manner (i.e., semantic control). Neuroimaging and neuropsychological studies identify a fronto-temporal network important for word comprehension. However, little is known about the connectional architecture subserving controlled retrieval and selection of semantic knowledge during word comprehension...
April 2013: Neuropsychologia
https://www.readbyqxmd.com/read/23322403/neurocognitive-brain-response-to-transient-impairment-of-wernicke-s-area
#14
Robert A Mason, Chantel S Prat, Marcel Adam Just
This study examined how the brain system adapts and reconfigures its information processing capabilities to maintain cognitive performance after a key cortical center [left posterior superior temporal gyrus (LSTGp)] is temporarily impaired during the performance of a language comprehension task. By applying repetitive transcranial magnetic stimulation (rTMS) to LSTGp and concurrently assessing the brain response with functional magnetic resonance imaging, we found that adaptation consisted of 1) increased synchronization between compensating regions coupled with a decrease in synchronization within the primary language network and 2) a decrease in activation at the rTMS site as well as in distal regions, followed by their recovery...
June 2014: Cerebral Cortex
https://www.readbyqxmd.com/read/23260615/the-neural-basis-of-semantic-cognition-converging-evidence-from-neuropsychology-neuroimaging-and-tms
#15
REVIEW
Elizabeth Jefferies
Recent studies suggest that a complex, distributed neural network underpins semantic cognition. This article reviews our contribution to this emerging picture and traces the putative roles of each region within this network. Neuropsychological studies indicate that semantic cognition draws on at least two interacting components: semantic representations [degraded in semantic dementia (SD)] and control processes [deficient in patients with multimodal semantic impairment following stroke aphasia (SA)]. To explore the first component, we employed distortion-corrected functional magnetic resonance imaging (fMRI) and transcranial magnetic stimulation (TMS) in healthy volunteers: these studies convergently indicated that the anterior temporal lobes (ATLs; atrophied in SD) combine information from different modalities within an amodal semantic "hub"...
March 2013: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/23227137/a-fmri-study-of-verbal-working-memory-cardiac-output-and-ejection-fraction-in-elderly-patients-with-cardiovascular-disease
#16
Farzin Irani, Lawrence H Sweet, Andreana P Haley, John J Gunstad, Beth A Jerskey, Richard C Mulligan, Angela L Jefferson, Athena Poppas, Ronald A Cohen
Cardiovascular disease (CVD) is associated with cognitive deficits even in the absence of stroke. We examined the relationship between cardiac performance, as measured by cardiac output (CO) and ejection fraction (EF), and brain activity during a verbal working memory (VWM) task in elderly CVD patients who tend to be at increased risk for vascular cognitive impairments. Seventeen patients were recruited from a cohort participating in an ongoing prospective study examining the effects of CVD on cognitive function in the elderly...
December 2009: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/22995440/longitudinal-evaluation-of-resting-state-fmri-after-acute-stroke-with-hemiparesis
#17
Ali-Mohammad Golestani, Sarah Tymchuk, Andrew Demchuk, Bradley G Goodyear
BACKGROUND: Functional magnetic resonance imaging (fMRI) of motor impairment after stroke strongly depends on patient effort and capacity to make a movement. Hence fMRI has had limited use in clinical management. Alternatively, resting-state fMRI (ie, with no task) can elucidate the brain's functional connections by determining temporal synchrony between brain regions. OBJECTIVE: The authors examined whether resting-state fMRI can elucidate the disruption of functional connections within hours of ischemic stroke as well as during recovery...
February 2013: Neurorehabilitation and Neural Repair
https://www.readbyqxmd.com/read/22829269/functional-magnetic-resonance-imaging-detection-of-vascular-reactivity-in-cerebral-amyloid-angiopathy
#18
Andrew Dumas, Gregory A Dierksen, M Edip Gurol, Amy Halpin, Sergi Martinez-Ramirez, Kristin Schwab, Jonathan Rosand, Anand Viswanathan, David H Salat, Jonathan R Polimeni, Steven M Greenberg
OBJECTIVE: In addition to its role in hemorrhagic stroke, advanced cerebral amyloid angiopathy (CAA) is also associated with ischemic lesions and vascular cognitive impairment. We used functional magnetic resonance imaging (MRI) techniques to identify CAA-associated vascular dysfunction. METHODS: Functional MRI was performed on 25 nondemented subjects with probable CAA (mean ± standard deviation age, 70.2 ± 7.8 years) and 12 healthy elderly controls (age, 75.3 ± 6...
July 2012: Annals of Neurology
https://www.readbyqxmd.com/read/21714757/neural-correlates-of-donepezil-induced-cognitive-improvement-in-patients-with-right-hemisphere-stroke-a-pilot-study
#19
RANDOMIZED CONTROLLED TRIAL
Won Hyuk Chang, Yun H Park, Suk Hoon Ohn, Chang-hyun Park, Peter K W Lee, Yun-Hee Kim
Donepezil has been proven effective in the treatment of Alzheimer's disease and vascular dementia. However, its effects on the cognitive neural network have not been fully investigated. The purpose of this study was to evaluate the effect of donepezil on reorganisation of the cognitive neural network in patients with post-stroke cognitive impairment using functional MRI (fMRI). Fourteen patients with stroke in the right hemisphere were enrolled. Participants were randomly assigned to the experimental or the control group...
August 2011: Neuropsychological Rehabilitation
https://www.readbyqxmd.com/read/21605598/abnormal-functional-connectivity-in-patients-with-vascular-cognitive-impairment-no-dementia-a-resting-state-functional-magnetic-resonance-imaging-study
#20
Ya-wen Sun, Lin-di Qin, Yan Zhou, Qun Xu, Li-jun Qian, Jing Tao, Jian-rong Xu
The functional connectivity (FC) method was used to investigate the changes in the resting state of patients with vascular cognitive impairment, no dementia (VCIND). Resting-state functional magnetic resonance images (fMRIs) were acquired from 16 patients with subcortical ischemic vascular disease (SIVD) who fulfilled the criteria for VCIND, as well as 18 age- and sex-matched subjects with SIVD with no cognitive impairment (control group). Posterior cingulate cortex connectivity was gathered by investigating synchronic low-frequency fMRI signal fluctuations with a temporal correlation method...
October 1, 2011: Behavioural Brain Research
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