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https://www.readbyqxmd.com/read/29716239/reduction-of-sound-evoked-midbrain-responses-observed-by-functional-magnetic-resonance-imaging-following-acute-acoustic-noise-exposure
#1
Bin Yang, Eddie Wong, Wai Hong Ho, Condon Lau, Ying Shing Chan, Ed X Wu
Short duration and high intensity acoustic exposures can lead to temporary hearing loss and auditory nerve degeneration. This study investigates central auditory system function following such acute exposures after hearing loss recedes. Adult rats were exposed to 100 dB sound pressure level noise for 15 min. Auditory brainstem responses (ABRs) were recorded with click sounds to check hearing thresholds. Functional magnetic resonance imaging (fMRI) was performed with tonal stimulation at 12 and 20 kHz to investigate central auditory changes...
April 2018: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/29595683/mapping-the-human-brain-during-a-specific-vojta-s-tactile-input-the-ipsilateral-putamen-s-role
#2
Ismael Sanz-Esteban, Cesar Calvo-Lobo, Marcos Ríos-Lago, Juan Álvarez-Linera, Daniel Muñoz-García, David Rodríguez-Sanz
A century of research in human brain parcellation has demonstrated that different brain areas are associated with functional tasks. New neuroscientist perspectives to achieve the parcellation of the human brain have been developed to know the brain areas activation and its relationship with different stimuli. This descriptive study aimed to compare brain regions activation by specific tactile input (STI) stimuli according to the Vojta protocol (STI-group) to a non-STI stimulation (non-STI-group). An exploratory functional magnetic resonance imaging (fMRI) study was performed...
March 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29563830/different-mechanisms-of-contralateral-or-ipsilateral-acupuncture-to-modulate-the-brain-activity-in-patients-with-unilateral-chronic-shoulder-pain-a-pilot-fmri-study
#3
Shuai Zhang, Xu Wang, Chao-Qun Yan, Shang-Qing Hu, Jian-Wei Huo, Zhong-Yan Wang, Ping Zhou, Chun-Hong Liu, Cun-Zhi Liu
Background: Chronic shoulder pain (CSP) is a common disease causing pain and functional limitation, which is highly prevalent and has substantial negative effects on the quality of life. Acupuncture has gained popularity and has been accepted gradually by many countries because it can successfully treat patients with chronic pain, but the specific brain mechanisms under acupuncture treatment for CSP remain unclear. Therefore, in this study, we aimed to 1) compare the clinical effects between acupuncture at the contralateral and ipsilateral Tiaokou (ST 38) point in patients with unilateral shoulder pain and 2) explore how contralateral- and ipsilateral-acupuncture modulates the regional homogeneity (ReHo) of patients with CSP...
2018: Journal of Pain Research
https://www.readbyqxmd.com/read/29555019/the-periaqueductal-gray-and-bayesian-integration-in-placebo-analgesia
#4
Arvina Grahl, Selim Onat, Christian Büchel
In placebo hypoalgesia research, the strength of treatment expectations and experiences are key components. However, the reliability or precision of expectations had been mostly ignored although being a likely source for interindividual differences. In the present study, we adopted a Bayesian framework, naturally combining expectation magnitudes and precisions. This postulates that expectations (prior) are integrated with incoming nociceptive information (likelihood) and both are weighted by their relative precision to form the pain percept and placebo effect...
March 20, 2018: ELife
https://www.readbyqxmd.com/read/29523503/the-physiological-bases-of-hidden-noise-induced-hearing-loss-protocol-for-a-functional-neuroimaging-study
#5
Rebecca Susan Dewey, Deborah A Hall, Hannah Guest, Garreth Prendergast, Christopher J Plack, Susan T Francis
BACKGROUND: Rodent studies indicate that noise exposure can cause permanent damage to synapses between inner hair cells and high-threshold auditory nerve fibers, without permanently altering threshold sensitivity. These demonstrations of what is commonly known as hidden hearing loss have been confirmed in several rodent species, but the implications for human hearing are unclear. OBJECTIVE: Our Medical Research Council-funded program aims to address this unanswered question, by investigating functional consequences of the damage to the human peripheral and central auditory nervous system that results from cumulative lifetime noise exposure...
March 9, 2018: JMIR Research Protocols
https://www.readbyqxmd.com/read/29507283/altered-brainstem-responses-to-modafinil-in-schizophrenia-implications-for-adjunctive-treatment-of-cognition
#6
Michael J Minzenberg, Jong H Yoon, Steffan K Soosman, Cameron S Carter
Candidate pro-cognitive drugs for schizophrenia targeting several neurochemical systems have consistently failed to demonstrate robust efficacy. It remains untested whether concurrent antipsychotic medications exert pharmacodynamic interactions that mitigate pro-cognitive action in patients. We used functional MRI (fMRI) in a randomized, double-blind, placebo-controlled within-subject crossover test of single-dose modafinil effects in 27 medicated schizophrenia patients, interrogating brainstem regions where catecholamine systems arise to innervate the cortex, to link cellular and systems-level models of cognitive control...
March 6, 2018: Translational Psychiatry
https://www.readbyqxmd.com/read/29486001/comparison-of-nrem-sleep-and-intravenous-sedation-through-local-information-processing-and-whole-brain-network-to-explore-the-mechanism-of-general-anesthesia
#7
COMPARATIVE STUDY
Yun Li, Shengpei Wang, Chuxiong Pan, Fushan Xue, Junfang Xian, Yaqi Huang, Xiaoyi Wang, Tianzuo Li, Huiguang He
BACKGROUND: The mechanism of general anesthesia (GA) has been explored for hundreds of years, but unclear. Previous studies indicated a possible correlation between NREM sleep and GA. The purpose of this study is to compare them by in vivo human brain function to probe the neuromechanism of consciousness, so as to find out a clue to GA mechanism. METHODS: 24 healthy participants were equally assigned to sleep or propofol sedation group by sleeping ability. EEG and Ramsay Sedation Scale were applied to determine sleep stage and sedation depth respectively...
2018: PloS One
https://www.readbyqxmd.com/read/29475059/ventrolateral-motor-thalamus-abnormal-connectivity-in-essential-tremor-before-and-after-thalamotomy-a-resting-state-functional-magnetic-resonance-imaging-study
#8
Constantin Tuleasca, Elena Najdenovska, Jean Régis, Tatiana Witjas, Nadine Girard, Jérôme Champoudry, Mohamed Faouzi, Jean-Philippe Thiran, Meritxell Bach Cuadra, Marc Levivier, Dimitri Van De Ville
OBJECTIVE: To evaluate functional connectivity (FC) of the ventrolateral thalamus, a common target for drug-resistant essential tremor (ET), resting-state data were analyzed before and 1 year after stereotactic radiosurgical thalamotomy and compared against healthy controls (HCs). METHODS: In total, 17 consecutive patients with ET and 10 HCs were enrolled. Tremor network was investigated using the ventrolateral ventral (VLV) thalamic nucleus as the region of interest, extracted with automated segmentation from pretherapeutic diffusion magnetic resonance imaging...
May 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29397089/brain-functional-connectivity-network-studies-of-acupuncture-a-systematic-review-on-resting-state-fmri
#9
REVIEW
Rong-Lin Cai, Guo-Ming Shen, Hao Wang, Yuan-Yuan Guan
BACKGROUND: Functional magnetic resonance imaging (fMRI) is a novel method for studying the changes of brain networks due to acupuncture treatment. In recent years, more and more studies have focused on the brain functional connectivity network of acupuncture stimulation. OBJECTIVE: To offer an overview of the different influences of acupuncture on the brain functional connectivity network from studies using resting-state fMRI. SEARCH STRATEGY: The authors performed a systematic search according to PRISMA guidelines...
January 2018: Journal of Integrative Medicine
https://www.readbyqxmd.com/read/29392456/distinct-manifestation-of-cognitive-deficits-associate-with-different-resting-state-network-disruptions-in-non-demented-patients-with-parkinson-s-disease
#10
Kazuya Kawabata, Hirohisa Watanabe, Kazuhiro Hara, Epifanio Bagarinao, Noritaka Yoneyama, Aya Ogura, Kazunori Imai, Michihito Masuda, Takamasa Yokoi, Reiko Ohdake, Yasuhiro Tanaka, Takashi Tsuboi, Tomohiko Nakamura, Masaaki Hirayama, Mizuki Ito, Naoki Atsuta, Satoshi Maesawa, Shinji Naganawa, Masahisa Katsuno, Gen Sobue
Cognitive deficits in Parkinson's disease (PD) are heterogeneous entities, but a relationship between the heterogeneity of cognitive deficits and resting-state network (RSN) changes remains elusive. In this study, we examined five sub-domain scores according to Addenbrooke's Cognitive Examination-Revised (ACE-R) for the cognitive evaluation and classification of 72 non-demented patients with PD. Twenty-eight patients were classified as PD with normal cognition (PD-NC). The remaining 44 were subdivided into the following 2 groups using a hierarchical cluster analysis: 20 with a predominant decrease in memory (PD with amnestic cognitive deficits: PD-A) and 24 with good memory who exhibited a decrease in other sub-domains (PD with non-amnestic cognitive deficits: PD-NA)...
March 2018: Journal of Neurology
https://www.readbyqxmd.com/read/29361441/neurophysiologic-effects-of-transcutaneous-auricular-vagus-nerve-stimulation-tavns-via-electrical-stimulation-of-the-tragus-a-concurrent-tavns-fmri-study-and-review
#11
Bashar W Badran, Logan T Dowdle, Oliver J Mithoefer, Nicholas T LaBate, James Coatsworth, Joshua C Brown, William H DeVries, Christopher W Austelle, Lisa M McTeague, Mark S George
BACKGROUND: Electrical stimulation of the auricular branch of the vagus nerve (ABVN) via transcutaneous auricular vagus nerve stimulation (taVNS) may influence afferent vagal networks. There have been 5 prior taVNS/fMRI studies, with inconsistent findings due to variability in stimulation targets and parameters. OBJECTIVE: We developed a taVNS/fMRI system to enable concurrent electrical stimulation and fMRI acquisition to compare the effects of taVNS in relation to control stimulation...
December 29, 2017: Brain Stimulation
https://www.readbyqxmd.com/read/29219633/brain-activity-during-phonation-in-healthy-female-singers-with-supraglottic-compression-an-fmri-pilot-study
#12
Maryna Kryshtopava, Kristiane Van Lierde, Charlotte Defrancq, Michiel De Moor, Zoë Thijs, Evelien D'Haeseleer, Iris Meerschman, Pieter Vandemaele, Guy Vingerhoets, Sofie Claeys
This pilot study evaluated the usability of functional magnetic resonance imaging (fMRI) to detect brain activation during phonation in healthy female singers with supraglottic compression. Four healthy female classical singers (mean age: 26 years) participated in the study. All subjects had normal vocal folds and vocal characteristics and showed supraglottic compression. The fMRI experiment was carried out using a block design paradigm. Brain activation during phonation and exhalation was analyzed using Brain Voyager software (Brain Innovation B...
December 8, 2017: Logopedics, Phoniatrics, Vocology
https://www.readbyqxmd.com/read/29218415/timing-of-cortical-activation-during-spontaneous-swallowing
#13
Erin Kamarunas, Rachel Mulheren, Katie Palmore, Christy Ludlow
Saliva accumulation in the oropharynx generates an automatic pattern of swallowing in the brainstem in animals. Previous fMRI studies have found that spontaneous saliva and water swallows in humans evoked activation following swallow onset in both precentral motor and postcentral somatosensory cortical regions. Using event-related averaging of continuous functional near infrared spectroscopy (fNIRS), we examined cortical hemodynamic responses (HDR) from 5 s before to 35 s after spontaneous reflexive saliva swallow onset in the lateral postcentral somatosensory and precentral motor regions in both hemispheres in healthy volunteers...
February 2018: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/29175957/brainstem-pain-control-circuitry-connectivity-in-chronic-neuropathic-pain
#14
Emily P Mills, Flavia Di Pietro, Zeynab Alshelh, Chris C Peck, Greg M Murray, E Russell Vickers, Luke A Henderson
Preclinical investigations have suggested that altered functioning of brainstem pain-modulation circuits may be crucial for the maintenance of some chronic pain conditions. While some human psychophysical studies show that patients with chronic pain display altered pain-modulation efficacy, it remains unknown whether brainstem pain-modulation circuits are altered in individuals with chronic pain. The aim of the present investigation was to determine whether, in humans, chronic pain following nerve injury is associated with altered ongoing functioning of the brainstem descending modulation systems...
January 10, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28986148/brain-activity-unique-to-orgasm-in-women-an-fmri-analysis
#15
Nan J Wise, Eleni Frangos, Barry R Komisaruk
BACKGROUND: Although the literature on imaging of regional brain activity during sexual arousal in women and men is extensive and largely consistent, that on orgasm is relatively limited and variable, owing in part to the methodologic challenges posed by variability in latency to orgasm in participants and head movement. AIM: To compare brain activity at orgasm (self- and partner-induced) with that at the onset of genital stimulation, immediately before the onset of orgasm, and immediately after the cessation of orgasm and to upgrade the methodology for obtaining and analyzing functional magnetic resonance imaging (fMRI) findings...
November 2017: Journal of Sexual Medicine
https://www.readbyqxmd.com/read/28951832/advancing-functional-dysconnectivity-and-atrophy-in-progressive-supranuclear-palsy
#16
Jesse A Brown, Alice Y Hua, Andrew Trujllo, Suneth Attygalle, Richard J Binney, Salvatore Spina, Suzee E Lee, Joel H Kramer, Bruce L Miller, Howard J Rosen, Adam L Boxer, William W Seeley
Progressive supranuclear palsy syndrome (PSP-S) results from neurodegeneration within a network of brainstem, subcortical, frontal and parietal cortical brain regions. It is unclear how network dysfunction progresses and relates to longitudinal atrophy and clinical decline. In this study, we evaluated patients with PSP-S (n = 12) and healthy control subjects (n = 20) at baseline and 6 months later. Subjects underwent structural MRI and task-free functional MRI (tf-fMRI) scans and clinical evaluations at both time points...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28949287/cardiorespiratory-concerns-shape-brain-responses-during-automatic-panic-related-scene-processing-in-patients-with-panic-disorder
#17
Katharina Feldker, Carina Yvonne Heitmann, Paula Neumeister, Leonie Brinkmann, Maximillan Bruchmann, Pienie Zwitserlood, Thomas Straube
BACKGROUND: Increased automatic processing of threat-related stimuli has been proposed as a key element in panic disorder. Little is known about the neural basis of automatic processing, in particular to task-irrelevant, panic-related, ecologically valid stimuli, or about the association between brain activation and symptomatology in patients with panic disorder. METHODS: The present event-related fMRI study compared brain responses to task-irrelevant, panic-related and neutral visual stimuli in medication-free patients with panic disorder and healthy controls...
September 26, 2017: Journal of Psychiatry & Neuroscience: JPN
https://www.readbyqxmd.com/read/28911803/sensory-overload-and-imbalance-resting-state-vestibular-connectivity-in-ptsd-and-its-dissociative-subtype
#18
Sherain Harricharan, Andrew A Nicholson, Maria Densmore, Jean Théberge, Margaret C McKinnon, Richard W J Neufeld, Ruth A Lanius
BACKGROUND: The vestibular system integrates multisensory information to monitor one's bodily orientation in space, and is influenced by interoceptive awareness. Post-traumatic stress disorder (PTSD) involves typically alterations in interoceptive and bodily self-awareness evidenced by symptoms of hyperarousal, as well as of emotional detachment, including emotional numbing, depersonalization, and derealization. These alterations may disrupt vestibular multisensory integration between the brainstem (vestibular nuclei) and key vestibular cortical regions (parieto-insular vestibular cortex, prefrontal cortex)...
September 11, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28819132/treatment-associated-changes-of-functional-connectivity-of-midbrain-brainstem-nuclei-in-major-depressive-disorder
#19
Gerd Wagner, Feliberto de la Cruz, Stefanie Köhler, Karl-Jürgen Bär
Previous functional magnetic resonance imaging (fMRI) studies demonstrated an abnormally coordinated network functioning in Major Depression Disorder (MDD) during rest. The main monoamine-producing nuclei within midbrain/brainstem are functionally integrated within these specific networks. Therefore, we aimed to investigate the resting-state functional connectivity (RSFC) of these nuclei in 45 MDD patients and differences between patients receiving two different classes of antidepressant drugs. Patients showed reduced RSFC from the ventral tegmental area (VTA) to dorsal anterior cingulate cortex (dACC) and stronger RSFC to the left amygdala and dorsolateral prefrontal cortex (DLPFC)...
August 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28729831/investigating-focal-connectivity-deficits-in-alzheimer-s-disease-using-directional-brain-networks-derived-from-resting-state-fmri
#20
Sinan Zhao, D Rangaprakash, Archana Venkataraman, Peipeng Liang, Gopikrishna Deshpande
Connectivity analysis of resting-state fMRI has been widely used to identify biomarkers of Alzheimer's disease (AD) based on brain network aberrations. However, it is not straightforward to interpret such connectivity results since our understanding of brain functioning relies on regional properties (activations and morphometric changes) more than connections. Further, from an interventional standpoint, it is easier to modulate the activity of regions (using brain stimulation, neurofeedback, etc.) rather than connections...
2017: Frontiers in Aging Neuroscience
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