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BOLD fMRI

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https://www.readbyqxmd.com/read/29778509/longitudinal-observations-using-simultaneous-fmri-multiple-channel-electrophysiology-recording-and-chemical-microiontophoresis-in-the-rat-brain
#1
Saul Jaime, Jose E Cavazos, Yihong Yang, Hanbing Lu
BACKGROUND: fMRI blood oxygenation level-dependent (BOLD) signal has been widely used as a surrogate for neural activity. However, interpreting differences in BOLD fMRI based on underlying neuronal activity remains a challenge. Concurrent rsMRI data collection and electrophysiological recording in combination with microiontophoretically injected modulatory chemicals allows for improved understanding of the relationship between resting state BOLD and neuronal activity. NEW METHODS: Simultaneous fMRI, multi-channel intracortical electrophysiology and focal pharmacological manipulation data to be acquired longitudinally in rats for up to 2 months...
May 17, 2018: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/29777890/cortical-activation-changes-in-hirayama-disease-following-anterior-cervical-decompression-and-fusion
#2
Hongli Wang, Yiwei Wu, Jian Song, Jianyuan Jiang, Feizhou Lu, Xiaosheng Ma, Xinlei Xia
BACKGROUND: Spinal cord injury may cause cortical reconstruction. We, therefore, explored thechanges in cortical activation before and after anterior cervical decompression and fusion surgery in patients with Hirayama disease (HD). METHODS: 17 HD cases were performed anterior cervical decompression and fusion surgery. BOLD-fMRI scan was performed preoperatively, 3 months, 6 months and 1 year after surgery. Activated voxels were compared between both hands after adjusting for head motion, slice timing, spatial normalization and image smoothing...
May 16, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29777827/is-reward-prediction-error-encoding-reliable-during-development
#3
Hanna Keren, Gang Chen, Brenda Benson, Monique Ernst, Ellen Leibenluft, Nathan A Fox, Daniel S Pine, Argyris Stringaris
Reward Prediction Errors (RPEs), defined as the difference between the expected and received outcomes, are integral to reinforcement learning models and play an important role in development and psychopathology. In humans, RPE encoding can be estimated using fMRI recordings, however, a basic measurement property of RPE signals, their test-retest reliability across different time scales, remains an open question. In this paper, we examine the 3-month and 3-year reliability of RPE encoding in youth (mean age at baseline = 10...
May 16, 2018: NeuroImage
https://www.readbyqxmd.com/read/29761531/fluctuations-of-the-eeg-fmri-correlation-reflect-intrinsic-strength-of-functional-connectivity-in-default-mode-network
#4
Tuija Keinänen, Seppo Rytky, Vesa Korhonen, Niko Huotari, Juha Nikkinen, Osmo Tervonen, J Matias Palva, Vesa Kiviniemi
Both functional magnetic resonance imaging (fMRI) and electrophysiological recordings have revealed that resting-state functional connectivity is temporally variable in human brain. Combined full-band electroencephalography-fMRI (fbEEG-fMRI) studies have shown that infraslow (<.1 Hz) fluctuations in EEG scalp potential are correlated with the blood-oxygen-level-dependent (BOLD) fMRI signals and that also this correlation appears variable over time. Here, we used simultaneous fbEEG-fMRI to test the hypothesis that correlation dynamics between BOLD and fbEEG signals could be explained by fluctuations in the activation properties of resting-state networks (RSNs) such as the extent or strength of their activation...
May 14, 2018: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/29760180/the-affective-and-neural-correlates-of-heroin-vs-cocaine-use-in-addiction-are-influenced-by-environmental-setting-but-in-opposite-directions
#5
Silvana De Pirro, Gaspare Galati, Luigi Pizzamiglio, Aldo Badiani
Previous studies have shown that individuals with heroin and cocaine addiction prefer to use these drugs in distinct settings: mostly at home in the case of heroin and mostly outside the home in the case of cocaine. Here we investigated whether the context would modulate the affective and neural responses to these drugs in a similar way. First, we used a novel emotional task to assess the affective state produced by heroin or cocaine in different settings, based on the recollections of male and female drug users...
May 14, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29758234/a-validation-of-dynamic-causal-modelling-for-7t-fmri
#6
S Tak, J Noh, C Cheong, P Zeidman, A Razi, W D Penny, K J Friston
BACKGROUND: There is growing interest in ultra-high field magnetic resonance imaging (MRI) in cognitive and clinical neuroscience studies. However, the benefits offered by higher field strength have not been evaluated in terms of effective connectivity and dynamic causal modelling (DCM). NEW METHOD: In this study, we address the validity of DCM for 7T functional MRI data at two levels. First, we evaluate the predictive validity of DCM estimates based upon 3T and 7T in terms of reproducibility...
May 11, 2018: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/29755315/does-post-task-declarative-learning-have-an-influence-on-early-motor-memory-consolidation-over-day-an-fmri-study
#7
Inken Rothkirch, Stephan Wolff, Nils G Margraf, Anya Pedersen, Karsten Witt
Previous studies demonstrated the influence of the post-learning period on procedural motor memory consolidation. In an early period after the acquisition, motor skills are vulnerable to modifications during wakefulness. Indeed, specific interventions such as world-list learning within this early phase of motor memory consolidation seem to enhance motor performance as an indicator for successful consolidation. This finding highlights the idea that manipulations of procedural and declarative memory systems during the early phase of memory consolidation over wakefulness may influence off-line consolidation...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29755312/integrated-fmri-preprocessing-framework-using-extended-kalman-filter-for-estimation-of-slice-wise-motion
#8
Basile Pinsard, Arnaud Boutin, Julien Doyon, Habib Benali
Functional MRI acquisition is sensitive to subjects' motion that cannot be fully constrained. Therefore, signal corrections have to be applied a posteriori in order to mitigate the complex interactions between changing tissue localization and magnetic fields, gradients and readouts. To circumvent current preprocessing strategies limitations, we developed an integrated method that correct motion and spatial low-frequency intensity fluctuations at the level of each slice in order to better fit the acquisition processes...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29754837/effects-of-exercise-on-gait-and-motor-imagery-in-people-with-parkinson-disease-and-freezing-of-gait
#9
Peter S Myers, Marie E McNeely, Kristen A Pickett, Ryan P Duncan, Gammon M Earhart
INTRODUCTION: Exercise improves gait in Parkinson disease (PD), but whether exercise differentially affects people with PD with (freezers) and without freezing of gait (non-freezers) remains unclear. This study examines exercise's effects on gait performance, neural correlates related to these effects, and potential neural activation differences between freezers and non-freezers during motor imagery (MI) of gait. METHODS: Thirty-seven participants from a larger exercise intervention completed behavioral assessments and functional magnetic resonance imaging (fMRI) scans before and after a 12-week exercise intervention...
May 8, 2018: Parkinsonism & related Disorders
https://www.readbyqxmd.com/read/29754022/resilience-and-amygdala-function-in-older-healthy-and-depressed-adults
#10
Amber M Leaver, Hongyu Yang, Prabha Siddarth, Roza M Vlasova, Beatrix Krause, Natalie St Cyr, Katherine L Narr, Helen Lavretsky
BACKGROUND: Previous studies suggest that low emotional resilience may correspond with increased or over-active amygdala function. Complementary studies suggest that emotional resilience increases with age; older adults tend to have decreased attentional bias to negative stimuli compared to younger adults. Amygdala nuclei and related brain circuits have been linked to negative affect, and depressed patients have been demonstrated to have abnormal amygdala function. METHODS: In the current study, we correlated psychological resilience measures with amygdala function measured with resting-state arterial spin-labelled (ASL) and blood-oxygenation-level-dependent (BOLD) functional magnetic resonance imaging (fMRI) in older adults with and without depression...
April 25, 2018: Journal of Affective Disorders
https://www.readbyqxmd.com/read/29753993/reliability-of-neural-activation-and-connectivity-during-implicit-face-emotion-processing-in-youth
#11
Simone P Haller, Katharina Kircanski, Joel Stoddard, Lauren K White, Gang Chen, Banafsheh Sharif-Askary, Susan Zhang, Kenneth E Towbin, Daniel S Pine, Ellen Leibenluft, Melissa A Brotman
Face emotion imaging paradigms are widely used in both healthy and psychiatric populations. Here, in children and adolescents, we evaluate the test-retest reliability of blood oxygenation-level dependent (BOLD) activation and task-based functional connectivity on a widely used implicit face emotion processing task (i.e., gender labeling). Twenty-five healthy youth (M age = 13.97 year s; 60% female) completed two functional magnetic resonance imaging (fMRI) scan sessions approximately two months apart...
March 27, 2018: Developmental Cognitive Neuroscience
https://www.readbyqxmd.com/read/29752872/functional-neuroimaging-of-nociceptive-and-pain-related-activity-in-the-spinal-cord-and-brain-insights-from-neurovascular-coupling-studies
#12
Thierry Paquette, Renaud Jeffrey-Gauthier, Hugues Leblond, Mathieu Piché
Spinal cord and brain processes underlie pain perception, which produces systemic cardiovascular changes. In turn, the autonomic nervous system regulates vascular function in the spinal cord and brain in order to adapt to these systemic changes, while neuronal activity induces local vascular changes. Thus, autonomic regulation and pain processes in the brain and spinal cord are tightly linked and interrelated. The objective of this topical review is to discuss work on neurovascular coupling during nociceptive processing in order to highlight supporting evidence and limitations for the use of cerebral and spinal fMRI to investigate pain mechanisms and spinal nociceptive processes...
May 12, 2018: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29744797/the-role-of-medial-prefrontal-cortex-in-processing-emotional-self-referential-information-a-combined-tms-fmri-study
#13
Nicola De Pisapia, Guido Barchiesi, Jorge Jovicich, Luigi Cattaneo
In this study we investigate the neural basis of emotional content in self-referential processing by using a combination of off-line repetitive Transcranial Magnetic Stimulation (rTMS) applied to the medial prefrontal cortex (mPFC) and whole-brain functional Magnetic Resonance Imaging (fMRI).We applied effective or ineffective (sham) 1-Hz rTMS to the mPFC of 14 healthy participants who immediately thereafter underwent fMRI while performing a personality attribution task to self or to others. rTMS produced an increase in the participants' reaction time (≈ 60 msec) when processing negative attributes...
May 9, 2018: Brain Imaging and Behavior
https://www.readbyqxmd.com/read/29740294/converging-evidence-from-electrocorticography-and-bold-fmri-for-a-sharp-functional-boundary-in-superior-temporal-gyrus-related-to-multisensory-speech-processing
#14
Muge Ozker, Daniel Yoshor, Michael S Beauchamp
Although humans can understand speech using the auditory modality alone, in noisy environments visual speech information from the talker's mouth can rescue otherwise unintelligible auditory speech. To investigate the neural substrates of multisensory speech perception, we compared neural activity from the human superior temporal gyrus (STG) in two datasets. One dataset consisted of direct neural recordings (electrocorticography, ECoG) from surface electrodes implanted in epilepsy patients (this dataset has been previously published)...
2018: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29738857/the-effect-of-tumour-neovasculature-on-fmri-bold-activation
#15
Layla Gould, Chelsea Ekstrand, Daryl R Fourney, Marla J S Mickleborough, Tasha Ellchuk, Ron Borowsky
We report a 40-year-old patient with a large, WHO grade III oligodendroglioma in the left parietal lobe. Presurgical planning included fMRI localization of language, motor, and somatosensory processing. The fMRI results for the motor and somatosensory tasks revealed activation in peri-lesional regions near the surgical resection, as well as deactivation in the tumour for the sensory task, suggesting that there is decreased autoregulation in the region due to the glioma. The fMRI results showed left hemisphere dominance for language, as well as activation in peri-lesional regions for all three speech tasks (i...
May 5, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29737415/spatial-temporal-dynamics-of-gesture-speech-integration-a-simultaneous-eeg-fmri-study
#16
Yifei He, Miriam Steines, Jens Sommer, Helge Gebhardt, Arne Nagels, Gebhard Sammer, Tilo Kircher, Benjamin Straube
The semantic integration between gesture and speech (GSI) is mediated by the left posterior temporal sulcus/middle temporal gyrus (pSTS/MTG) and the left inferior frontal gyrus (IFG). Evidence from electroencephalography (EEG) suggests that oscillations in the alpha and beta bands may support processes at different stages of GSI. In the present study, we investigated the relationship between electrophysiological oscillations and blood-oxygen-level-dependent (BOLD) activity during GSI. In a simultaneous EEG-fMRI study, German participants (n = 19) were presented with videos of an actor either performing meaningful gestures in the context of a comprehensible German (GG) or incomprehensible Russian sentence (GR), or just speaking a German sentence (SG)...
May 8, 2018: Brain Structure & Function
https://www.readbyqxmd.com/read/29730495/mouse-fmri-under-ketamine-and-xylazine-anesthesia-robust-contralateral-somatosensory-cortex-activation-in-response-to-forepaw-stimulation
#17
Hyun-Ji Shim, Won Beom Jung, Felix Schlegel, Joonsung Lee, Sangwoo Kim, Jungryun Lee, Seong-Gi Kim
Mouse fMRI is critically useful to investigate functions of transgenic mouse models. Until now, the somatosensory-evoked responses in anesthetized mice are often widespread and inconsistent across reports. Here, we adopted a ketamine and xylazine mixture for mouse fMRI, which is relatively new anesthetics in fMRI experiments. Forepaw stimulation frequency was optimized using cerebral blood volume (CBV)-weighted optical imaging (n = 11) and blood-oxygenation-level dependent (BOLD) fMRI with a gradient-echo time of 16 ms at 9...
May 3, 2018: NeuroImage
https://www.readbyqxmd.com/read/29723641/contributions-of-dopaminergic-and-non-dopaminergic-neurons-to-vta-stimulation-induced-neurovascular-responses-in-brain-reward-circuits
#18
Marta Brocka, Cornelia Helbing, Daniel Vincenz, Thomas Scherf, Dirk Montag, Jürgen Goldschmidt, Frank Angenstein, Michael Lippert
Mapping the activity of the human mesolimbic dopamine system by BOLD-fMRI is a tempting approach to non-invasively study the action of the brain reward system during different experimental conditions. However, the contribution of dopamine release to the BOLD signal is disputed. To assign the actual contribution of dopaminergic and non-dopaminergic VTA neurons to the formation of BOLD responses in target regions of the mesolimbic system, we used two optogenetic approaches in rats. We either activated VTA dopaminergic neurons selectively, or dopaminergic and mainly glutamatergic projecting neurons together...
April 30, 2018: NeuroImage
https://www.readbyqxmd.com/read/29723554/decreased-resting-state-bold-regional-homogeneity-and-the-intrinsic-functional-connectivity-within-dorsal-striatum-is-associated-with-greater-impulsivity-in-food-related-decision-making-and-bmi-change-at-6-month-follow-up
#19
Xiao Gao, Qianlin Liang, Guorong Wu, Ying She, Nan Sui, Hong Chen
Increasing animal models as well as brain imaging studies among human suggest an association between substance-related impulsivity in decision-making and decreased function of dorsal striatum. However, the resting-state intrinsic functional organization of dorsal striatum underlying food-choice impulsivity remains unknown. To address this issue, we used resting-state functional MRI (rs-fMRI) to measure brain activity among adult females. Subjects underwent the food rating task, during which they rated each food item according to their subjective perception of its taste (from Dislike it very much to Like it very much), its long term effect on health (from very unhealthy to very healthy) and decision strength to eat it (from Strong no to Strong yes)...
April 30, 2018: Appetite
https://www.readbyqxmd.com/read/29723244/the-social-brain-is-highly-sensitive-to-the-mere-presence-of-social-information-an-automated-meta-analysis-and-an-independent-study
#20
Ivy F Tso, Saige Rutherford, Yu Fang, Mike Angstadt, Stephan F Taylor
How the human brain processes social information is an increasingly researched topic in psychology and neuroscience, advancing our understanding of basic human cognition and psychopathologies. Neuroimaging studies typically seek to isolate one specific aspect of social cognition when trying to map its neural substrates. It is unclear if brain activation elicited by different social cognitive processes and task instructions are also spontaneously elicited by general social information. In this study, we investigated whether these brain regions are evoked by the mere presence of social information using an automated meta-analysis and confirmatory data from an independent study of simple appraisal of social vs...
2018: PloS One
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