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https://www.readbyqxmd.com/read/28446645/hypothalamus-as-a-mediator-of-chronic-migraine-evidence-from-high-resolution-fmri
#1
Laura H Schulte, Angie Allers, Arne May
OBJECTIVE: To identify pathophysiologic mechanisms of migraine chronification using a recently standardized protocol for high-resolution brainstem imaging of trigeminal nociceptive stimulation. METHODS: Eighteen episodic migraineurs (EMs), 17 chronic migraineurs (CMs), and 19 healthy controls (HCs) underwent painful ammonia stimulation of the left nostril in a 3T MRI scanner. Functional images were acquired with a brainstem-optimized protocol for high-resolution echo-planar imaging...
April 26, 2017: Neurology
https://www.readbyqxmd.com/read/28410773/brain-activity-during-phonation-in-women-with-muscle-tension-dysphonia-an-fmri-study
#2
Maryna Kryshtopava, Kristiane Van Lierde, Iris Meerschman, Evelien D'Haeseleer, Pieter Vandemaele, Guy Vingerhoets, Sofie Claeys
OBJECTIVES: The main objectives of this functional magnetic resonance imaging (fMRI) study are (1) to investigate brain activity during phonation in women with muscle tension dysphonia (MTD) in comparison with healthy controls; and (2) to explain the neurophysiological mechanism of laryngeal hyperfunction/tension during phonation in patients with MTD. METHODS: Ten women with MTD and fifteen healthy women participated in this study. The fMRI experiment was carried out using a block design paradigm...
April 11, 2017: Journal of Voice: Official Journal of the Voice Foundation
https://www.readbyqxmd.com/read/28383284/dynamic-modulation-of-decision-biases-by-brainstem-arousal-systems
#3
Jan Willem de Gee, Olympia Colizoli, Niels A Kloosterman, Tomas Knapen, Sander Nieuwenhuis, Tobias H Donner
Decision-makers often arrive at different choices when faced with repeated presentations of the same evidence. Variability of behavior is commonly attributed to noise in the brain's decision-making machinery. We hypothesized that phasic responses of brainstem arousal systems are a significant source of this variability. We tracked pupil responses (a proxy of phasic arousal) during sensory-motor decisions in humans, across different sensory modalities and task protocols. Large pupil responses generally predicted a reduction in decision bias...
April 6, 2017: ELife
https://www.readbyqxmd.com/read/28325028/tracking-intrinsic-connectivity-brain-network-features-during-successive-pseudo-resting-states-and-interoceptive-task-fmri
#4
Behnaz Jarrahi, Dante Mantini
Advanced multivariate analyses of functional magnetic resonance imaging (fMRI) data based on blood oxygen level-dependent (BOLD) contras have revealed that the human brain organizes its activities into multiple intrinsic connectivity networks (ICNs). Several fMRI studies have evaluated the modulations of these networks during different cognitive or emotional tasks using blind source separation techniques particularly the independent component analysis (ICA). In this exploratory study, we applied ICA methodology to examine ICN modulations under different interoceptive conditions...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28264983/frontal-brainstem-pathways-mediating-placebo-effects-on-social-rejection
#5
Leonie Koban, Ethan Kross, Choong-Wan Woo, Luka Ruzic, Tor D Wager
Placebo treatments can strongly affect clinical outcomes, but research on how they shape other life experiences and emotional well-being is in its infancy. We used fMRI in humans to examine placebo effects on a particularly impactful life experience, social pain elicited by a recent romantic rejection. We compared these effects with placebo effects on physical (heat) pain, which are thought to depend on pathways connecting prefrontal cortex and periaqueductal gray (PAG). Placebo treatment, compared with control, reduced both social and physical pain, and increased activity in the dorsolateral prefrontal cortex (dlPFC) in both modalities...
March 29, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28248867/structural-and-functional-brain-changes-in-early-and-mid-stage-primary-open-angle-glaucoma-using-voxel-based-morphometry-and-functional-magnetic-resonance-imaging
#6
Ming-Ming Jiang, Qing Zhou, Xiao-Yong Liu, Chang-Zheng Shi, Jian Chen, Xiang-He Huang
To investigate structural and functional brain changes in patients with primary open-angle glaucoma (POAG) by using voxel-based morphometry based on diffeomorphic anatomical registration through exponentiated Lie algebra (VBM-DARTEL) and blood oxygenation level dependent functional magnetic resonance imaging (BOLD-fMRI), respectively.Thirteen patients diagnosed with POAG and 13 age- and sex-matched healthy controls were enrolled in the study. For each participant, high-resolution structural brain imaging and blood flow imaging were acquired on a 3...
March 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28229931/modulation-of-the-sensorimotor-system-by-sustained-manual-pressure-stimulation
#7
Pavel Hok, Jaroslav Opavský, Miroslav Kutín, Zbyněk Tüdös, Petr Kaňovský, Petr Hluštík
In Vojta physiotherapy, also known as reflex locomotion therapy, prolonged peripheral pressure stimulation induces complex generalized involuntary motor responses and modifies subsequent behavior, but its neurobiological basis remains unknown. We hypothesized that the stimulation would induce sensorimotor activation changes in functional magnetic resonance imaging (fMRI) during sequential finger opposition. Thirty healthy volunteers (mean age 24.2) underwent two randomized fMRI sessions involving manual pressure stimulation applied either at the right lateral heel according to Vojta, or at the right lateral ankle (control site)...
February 14, 2017: Neuroscience
https://www.readbyqxmd.com/read/28227771/tracking-intrinsic-connectivity-brain-network-features-during-successive-pseudo-resting-states-and-interoceptive-task-fmri
#8
Behnaz Jarrahi, Dante Mantini, Behnaz Jarrahi, Dante Mantini, Behnaz Jarrahi, Dante Mantini
Advanced multivariate analyses of functional magnetic resonance imaging (fMRI) data based on blood oxygen level-dependent (BOLD) contras have revealed that the human brain organizes its activities into multiple intrinsic connectivity networks (ICNs). Several fMRI studies have evaluated the modulations of these networks during different cognitive or emotional tasks using blind source separation techniques particularly the independent component analysis (ICA). In this exploratory study, we applied ICA methodology to examine ICN modulations under different interoceptive conditions...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28181091/neuro-emotional-technique-effects-on-brain-physiology-in-cancer-patients-with-traumatic-stress-symptoms-preliminary-findings
#9
Daniel A Monti, Anna Tobia, Marie Stoner, Nancy Wintering, Michael Matthews, Xiao-Song He, Gaelle Doucet, Inna Chervoneva, Joseph I Tracy, Andrew B Newberg
PURPOSE: The purpose of this study was to characterize the neurophysiological and clinical effects that may result from the neuro emotional technique (NET) in patients with traumatic stress symptoms associated with a cancer-related event. We hypothesized that self-regulatory processing of traumatic memories would be observable as physiological changes in key brain areas after undergoing the NET intervention and that these changes would be associated with improvement of traumatic stress symptoms...
February 8, 2017: Journal of Cancer Survivorship: Research and Practice
https://www.readbyqxmd.com/read/28174516/anocva-in-r-a-software-to-compare-clusters-between-groups-and-its-application-to-the-study-of-autism-spectrum-disorder
#10
Maciel C Vidal, João R Sato, Joana B Balardin, Daniel Y Takahashi, André Fujita
Understanding how brain activities cluster can help in the diagnosis of neuropsychological disorders. Thus, it is important to be able to identify alterations in the clustering structure of functional brain networks. Here, we provide an R implementation of Analysis of Cluster Variability (ANOCVA), which statistically tests (1) whether a set of brain regions of interest (ROI) are equally clustered between two or more populations and (2) whether the contribution of each ROI to the differences in clustering is significant...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28162639/-395-brainstem-activity-and-connectivity-is-modulated-by-respiratory-gated-auricular-vagus-afferent-nerve-stimulation-ravans-in-migraine-patients-an-fmri-study
#11
R Garcia, R Lin, J Lee, M Loggia, J Kim, H Kim, A Wasan, R Edwards, N Hadjikhani, V Napadow
No abstract text is available yet for this article.
April 2016: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/28158166/abnormal-local-brain-activity-beyond-the-pain-matrix-in-postherpetic-neuralgia-patients-a-resting-state-functional-mri-study
#12
Song Cao, Ganjun Song, Yi Zhang, Peng Xie, Ye Tu, Ying Li, Tian Yu, Buwei Yu
BACKGROUND: Postherpetic neuralgia (PHN) patients suffer debilitating chronic pain, hyperalgesia, and allodynia, as well as emotional disorders such as insomnia, anxiety, and depression. The brain structure and functional basis of PHN are still not fully understood. OBJECTIVES: To identify the changes of regional brain activity in resting-state PHN patients using regional homogeneity (ReHo) and fractional aptitude of low-frequency fluctuation (fALFF) methods. Correlations between spontaneous pain intensity and ReHo or fALFF were analyzed...
February 2017: Pain Physician
https://www.readbyqxmd.com/read/28131178/cortical-control-of-vertical-and-horizontal-saccades-in-progressive-supranuclear-palsy-an-exploratory-fmri-study
#13
J Lemos, D Pereira, L Almendra, D Rebelo, M Patrício, J Castelhano, G Cunha, C Januário, L Cunha, A Freire, M Castelo-Branco
Progressive supranuclear palsy (PSP) is a neurodegenerative disorder showing predominant brainstem involvement, characterized by marked slowing of rapid eye movements (saccades), particularly along the vertical plane. While the contribution of the brainstem damage for the saccadic disturbance in PSP has been extensively studied, much less is known about its cortical and subcortical pathomechanisms. We measured reflexive (prosaccades) and voluntary (antisaccades) saccades in the vertical and horizontal plane in PSP patients (n=8) and controls (n=10) in an eye tracking study, followed by the measurement of blood oxygenation-level dependent (BOLD) activation (PSP, n=6; controls, n=10) during similar saccade paradigms...
February 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28123019/cortical-correlates-of-the-auditory-frequency-following-and-onset-responses-eeg-and-fmri-evidence
#14
Emily B J Coffey, Gabriella Musacchia, Robert J Zatorre
The frequency-following response (FFR) is a measure of the brain's periodic sound encoding. It is of increasing importance for studying the human auditory nervous system due to numerous associations with auditory cognition and dysfunction. Although the FFR is widely interpreted as originating from brainstem nuclei, a recent study using MEG suggested that there is also a right-lateralized contribution from the auditory cortex at the fundamental frequency (Coffey et al., 2016b). Our objectives in the present work were to validate and better localize this result using a completely different neuroimaging modality and to document the relationships between the FFR, the onset response, and cortical activity...
January 25, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28104084/access-to-vagal-projections-via-cutaneous-electrical-stimulation-of-the-neck-fmri-evidence-in-healthy-humans
#15
Eleni Frangos, Barry R Komisaruk
BACKGROUND: Stimulation of the vagus nerve via implanted electrodes is currently used to treat refractory epilepsy and depression. Recently, a non-invasive approach to vagal stimulation has demonstrated similar beneficial effects, but it remains unclear whether these effects are mediated via activation of afferent vagal fibers. OBJECTIVE: The present study was designed to ascertain whether afferent vagal projections can be accessed non-invasively by transcutaneous electrical stimulation of the antero-lateral surface of the neck, which overlies the course of the vagus nerve...
January 2017: Brain Stimulation
https://www.readbyqxmd.com/read/28074492/confirmation-of-resting-state-bold-fluctuations-in-the-human-brainstem-and-spinal-cord-after-identification-and-removal-of-physiological-noise
#16
Shreyas Harita, Patrick W Stroman
PURPOSE: Resting-state functional MRI (rs-fMRI) has been used to investigate networks within the cortex, but its use in the brainstem (BS) and spinal cord (SC) has been limited. This region presents challenges for fMRI, partly because of sources of physiological noise. This study aims to quantify noise contributions to rs-fMRI, and to obtain evidence of resting-state blood oxygenation level-dependent (BOLD) fluctuations. METHODS: Resting-state-fMRI data were obtained from the BS/SC in 16 participants, at 3 Tesla, with T2 -weighted single-shot fast spin-echo imaging...
January 11, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28048305/su-f-j-139-amplitude-of-low-frequency-fluctuation-alff-and-regional-homogeneity-reho-study-of-the-respiration-motion-control-byhypnosis
#17
Y Liu, R Li, Y Xie
PURPOSE: Respiration control by hypnosis is a method in reducing the detriment to the healthy organs or organizations for patients during radiotherapy, especially for lung and abdomen cancer (Fig.1). It's hypothesized that there exists alterations neurological brain activity during the hypnosis state of respiratory motion control in comparison with resting state. METHODS: Thirteen healthy volunteers were organized to participate in a hypnosis experiment that consisted of two sectional scans of functional magnetic resonance imaging (fMRI), rest state condition (RSC) scanning and hypnosis state condition (HSC) scanning...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/27980112/cortical-correlates-of-the-auditory-frequency-following-and-onset-responses-eeg-and-fmri-evidence
#18
Emily B J Coffey, Gabriella Musacchia, Robert J Zatorre
The frequency following response (FFR) is a measure of the brain's periodic sound encoding. It is of increasing importance for studying the human auditory nervous system due to numerous associations with auditory cognition and dysfunction. Although the FFR is widely interpreted as originating from brainstem nuclei, a recent study using magnetoencephalography (MEG) suggested that there is also a right-lateralized contribution from the auditory cortex at the fundamental frequency (Coffey et al., 2016c). Our objectives in the present work were to validate and better localize this result using a completely different neuroimaging modality, and document the relationships between the FFR and the onset response, and cortical activity...
December 15, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27978801/visual-sexual-stimulation-and-erection-a-brief-review-with-new-fmri-data
#19
Sharon L Wu, Maggie Sm Chow, Y L Jiang, Jingjin Yang, Hao Zhou, David T Yew
This review examines brain sites involved in sexual stimulation. New data on brain activation sites in individuals having erections concomitant with visual erotic stimulation was documented. The activation was chiefly at the midbrain around the cerebral peduncle, and in the pons centering on the tegmentum, they are indicated by blood oxygenation level dependent (BOLD) images captured by functional magnetic resonance imaging (fMRI). The cerebellum and inferior temporal lobe were activated more extensively in individuals viewing pornographic movie with a concomitant erection than those without...
December 12, 2016: Current Medicinal Chemistry
https://www.readbyqxmd.com/read/27932883/functional-cortical-changes-in-relapsing-remitting-multiple-sclerosis-at-amplitude-configuration-a-resting-state-fmri-study
#20
Heng Liu, Hua Chen, Bo Wu, Tijiang Zhang, Jinhui Wang, Kexin Huang, Ganjun Song, Jian Zhan
OBJECTIVE: The aim of this study was to explore the amplitude of spontaneous brain activity fluctuations in patients with relapsing-remitting multiple sclerosis (RRMS) using the amplitude of low-frequency fluctuation (ALFF) method. METHODS: ALFF and SPM8 were utilized to assess alterations in regional spontaneous brain activities in patients with RRMS in comparison with healthy controls (HCs). The beta values of altered brain regions between patients with RRMS and HCs were extracted, and a receiver operating characteristic (ROC) curve was generated to calculate the sensitivities and specificities of these different brain areas for distinguishing patients with RRMS from HCs...
2016: Neuropsychiatric Disease and Treatment
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