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https://www.readbyqxmd.com/read/28345642/dynamic-changes-in-amygdala-psychophysiological-connectivity-reveal-distinct-neural-networks-for-facial-expressions-of-basic-emotions
#1
Matteo Diano, Marco Tamietto, Alessia Celeghin, Lawrence Weiskrantz, Mona-Karina Tatu, Arianna Bagnis, Sergio Duca, Giuliano Geminiani, Franco Cauda, Tommaso Costa
The quest to characterize the neural signature distinctive of different basic emotions has recently come under renewed scrutiny. Here we investigated whether facial expressions of different basic emotions modulate the functional connectivity of the amygdala with the rest of the brain. To this end, we presented seventeen healthy participants (8 females) with facial expressions of anger, disgust, fear, happiness, sadness and emotional neutrality and analyzed amygdala's psychophysiological interaction (PPI). In fact, PPI can reveal how inter-regional amygdala communications change dynamically depending on perception of various emotional expressions to recruit different brain networks, compared to the functional interactions it entertains during perception of neutral expressions...
March 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28339164/are-schizophrenia-autistic-and-obsessive-spectrum-disorders-dissociable-on-the-basis-of-neuroimaging-morphological-findings-a-voxel-based-meta-analysis
#2
Franco Cauda, Tommaso Costa, Andrea Nani, Luciano Fava, Sara Palermo, Francesca Bianco, Sergio Duca, Karina Tatu, Roberto Keller
Schizophrenia spectrum disorder (SCZD), autism spectrum disorder (ASD), and obsessive-compulsive spectrum disorder (OCSD) are considered as three separate psychiatric conditions with, supposedly, different brain alterations patterns. From a neuroimaging perspective, this meta-analytic study aimed to address whether this nosographical differentiation is actually supported by different brain patterns of gray matter (GM) or white matter (WM) morphological alterations. We explored two possibilities: (a) to find out whether GM alterations are specific for SCZD, ASD, and OCSD; and (b) to associate the identified brain alteration patterns with cognitive dysfunctions by means of an analysis of lesion decoding...
March 24, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/28338793/sensitivity-to-perception-level-differentiates-two-subnetworks-within-the-mirror-neuron-system
#3
Shiri Simon, Roy Mukamel
Mirror neurons are a subset of brain cells that discharge during action execution and passive observation of similar actions. An open question concerns the functional role of their ability to match observed and executed actions. Since understanding of goals requires conscious perception of actions, we expect that mirror neurons potentially involved in action goal coding, will be modulated by changes in action perception level. Here, we manipulated perception level of action videos depicting short hand movements and measured the corresponding fMRI BOLD responses in mirror regions...
February 17, 2017: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/28336572/the-computational-and-neural-basis-of-rhythmic-timing-in-medial-premotor-cortex
#4
Hugo Merchant, Bruno B Averbeck
The neural underpinnings of rhythmic behavior, including music and dance, have been studied using the synchronization-continuation task (SCT), where subjects initially tap in synchrony with an isochronous metronome and then keep tapping at a similar rate via an internal beat mechanism. Here, we provide behavioral and neural evidence that supports a resetting drift-diffusion model (DDM) during SCT. Behaviorally, we show the model replicates the linear relation between the mean and standard-deviation of the intervals produced by monkeys in SCT...
March 23, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28336296/serotonin-and-dopamine-transporter-pet-changes-in-the-premotor-phase-of-lrrk2-parkinsonism-cross-sectional-studies
#5
Daryl J Wile, Pankaj A Agarwal, Michael Schulzer, Edwin Mak, Katherine Dinelle, Elham Shahinfard, Nasim Vafai, Kazuko Hasegawa, Jing Zhang, Jessamyn McKenzie, Nicole Neilson, Audrey Strongosky, Ryan J Uitti, Mark Guttman, Cyrus P Zabetian, Yu-Shin Ding, Mike Adam, Jan Aasly, Zbigniew K Wszolek, Matthew Farrer, Vesna Sossi, A Jon Stoessl
BACKGROUND: People with Parkinson's disease can show premotor neurochemical changes in the dopaminergic and non-dopaminergic systems. Using PET, we assessed whether dopaminergic and serotonin transporter changes are similar in LRRK2 mutation carriers with Parkinson's disease and individuals with sporadic Parkinson's disease, and whether LRRK2 mutation carriers without motor symptoms show PET changes. METHODS: We did two cross-sectional PET studies at the Pacific Parkinson's Research Centre in Vancouver, BC, Canada...
March 20, 2017: Lancet Neurology
https://www.readbyqxmd.com/read/28334314/a-template-and-probabilistic-atlas-of-the-human-sensorimotor-tracts-using-diffusion-mri
#6
Derek B Archer, David E Vaillancourt, Stephen A Coombes
The purpose of this study was to develop a high-resolution sensorimotor area tract template (SMATT) which segments corticofugal tracts based on 6 cortical regions in primary motor cortex, dorsal premotor cortex, ventral premotor cortex, supplementary motor area (SMA), pre-supplementary motor area (preSMA), and primary somatosensory cortex using diffusion tensor imaging. Individual probabilistic tractography analyses were conducted in 100 subjects using the highest resolution data currently available. Tractography results were refined using a novel algorithm to objectively determine slice level thresholds that best minimized overlap between tracts while preserving tract volume...
March 14, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28334082/decoding-grasping-movements-from-the-parieto-frontal-reaching-circuit-in-the-nonhuman-primate
#7
Koen Nelissen, Prosper Agbesi Fiave, Wim Vanduffel
Prehension movements typically include a reaching phase, guiding the hand toward the object, and a grip phase, shaping the hand around it. The dominant view posits that these components rely upon largely independent parieto-frontal circuits: a dorso-medial circuit involved in reaching and a dorso-lateral circuit involved in grasping. However, mounting evidence suggests a more complex arrangement, with dorso-medial areas contributing to both reaching and grasping. To investigate the role of the dorso-medial reaching circuit in grasping, we trained monkeys to reach-and-grasp different objects in the dark and determined if hand configurations could be decoded from functional magnetic resonance imaging (MRI) responses obtained from the reaching and grasping circuits...
February 18, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28333379/motor-neurons
#8
Jorn Hounsgaard
Motor neurons translate synaptic input from widely distributed premotor networks into patterns of action potentials that orchestrate motor unit force and motor behavior. Intercalated between the CNS and muscles, motor neurons add to and adjust the final motor command. The identity and functional properties of this facility in the path from synaptic sites to the motor axon is reviewed with emphasis on voltage sensitive ion channels and regulatory metabotropic transmitter pathways. The catalog of the intrinsic response properties, their underlying mechanisms, and regulation obtained from motoneurons in in vitro preparations is far from complete...
March 16, 2017: Comprehensive Physiology
https://www.readbyqxmd.com/read/28331352/skin-disorders-in-parkinson-s-disease-potential-biomarkers-and-risk-factors
#9
REVIEW
Astrid-Helene Ravn, Jacob P Thyssen, Alexander Egeberg
Parkinson's disease (PD) is one of the most common neurodegenerative disorders, characterized by a symptom triad comprising resting tremor, rigidity, and akinesia. In addition, non-motor symptoms of PD are well recognized and often precede the overt motor manifestations. Cutaneous manifestations as markers of PD have long been discussed, and cumulative evidence shows an increased prevalence of certain dermatological disorders in PD. Seborrheic dermatitis is considered to occur as a premotor feature of PD referable to dysregulation of the autonomic nervous system...
2017: Clinical, Cosmetic and Investigational Dermatology
https://www.readbyqxmd.com/read/28323166/neural-foundations-of-overt-and-covert-actions
#10
Panagiotis G Simos, Eleftherios Kavroulakis, Thomas Maris, Efrosini Papadaki, Themistoklis Boursianis, Giorgos Kalaitzakis, Helen E Savaki
We used fMRI to assess the human brain areas activated for execution, observation and 1st person motor imagery of a visually guided tracing task with the index finger. Voxel-level conjunction analysis revealed several cortical areas activated in common across all three motor conditions, namely, the upper limb representation of the primary motor and somatosensory cortices, the dorsal and ventral premotor, the superior and inferior parietal cortices as well as the posterior part of the superior and middle temporal gyrus including the temporo-parietal junction (TPj) and the extrastriate body area (EBA)...
March 18, 2017: NeuroImage
https://www.readbyqxmd.com/read/28321973/cortical-and-subcortical-mechanisms-of-brain-machine-interfaces
#11
Silvia Marchesotti, Roberto Martuzzi, Aaron Schurger, Maria Laura Blefari, José R Del Millán, Hannes Bleuler, Olaf Blanke
Technical advances in the field of Brain-Machine Interfaces (BMIs) enable users to control a variety of external devices such as robotic arms, wheelchairs, virtual entities and communication systems through the decoding of brain signals in real time. Most BMI systems sample activity from restricted brain regions, typically the motor and premotor cortex, with limited spatial resolution. Despite the growing number of applications, the cortical and subcortical systems involved in BMI control are currently unknown at the whole-brain level...
March 21, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28321186/brain-activity-during-mental-imagery-of-gait-versus-gait-like-plantar-stimulation-a-novel-combined-functional-mri-paradigm-to-better-understand-cerebral-gait-control
#12
Matthieu Labriffe, Cédric Annweiler, Liubov E Amirova, Guillemette Gauquelin-Koch, Aram Ter Minassian, Louis-Marie Leiber, Olivier Beauchet, Marc-Antoine Custaud, Mickaël Dinomais
Human locomotion is a complex sensorimotor behavior whose central control remains difficult to explore using neuroimaging method due to technical constraints, notably the impossibility to walk with a scanner on the head and/or to walk for real inside current scanners. The aim of this functional Magnetic Resonance Imaging (fMRI) study was to analyze interactions between two paradigms to investigate the brain gait control network: (1) mental imagery of gait, and (2) passive mechanical stimulation of the plantar surface of the foot with the Korvit boots...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28317947/parietal-operculum-and-motor-cortex-activities-predict-motor-recovery-in-moderate-to-severe-stroke
#13
Firdaus Fabrice Hannanu, Thomas A Zeffiro, Laurent Lamalle, Olivier Heck, Félix Renard, Antoine Thuriot, Alexandre Krainik, Marc Hommel, Olivier Detante, Assia Jaillard
While motor recovery following mild stroke has been extensively studied with neuroimaging, mechanisms of recovery after moderate to severe strokes of the types that are often the focus for novel restorative therapies remain obscure. We used fMRI to: 1) characterize reorganization occurring after moderate to severe subacute stroke, 2) identify brain regions associated with motor recovery and 3) to test whether brain activity associated with passive movement measured in the subacute period could predict motor outcome six months later...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28317880/antidromic-rectifying-gap-junctions-amplify-chemical-transmission-at-functionally-mixed-electrical-chemical-synapses
#14
Ping Liu, Bojun Chen, Roger Mailler, Zhao-Wen Wang
Neurons communicate through chemical synapses and electrical synapses (gap junctions). Although these two types of synapses often coexist between neurons, little is known about whether they interact, and whether any interactions between them are important to controlling synaptic strength and circuit functions. By studying chemical and electrical synapses between premotor interneurons (AVA) and downstream motor neurons (A-MNs) in the Caenorhabditis elegans escape circuit, we found that disrupting either the chemical or electrical synapses causes defective escape response...
March 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28316564/functional-circuitry-effect-of-ventral-tegmental-area-deep-brain-stimulation-imaging-and-neurochemical-evidence-of-mesocortical-and-mesolimbic-pathway-modulation
#15
Megan L Settell, Paola Testini, Shinho Cho, Jannifer H Lee, Charles D Blaha, Hang J Jo, Kendall H Lee, Hoon-Ki Min
Background: The ventral tegmental area (VTA), containing mesolimbic and mesocortical dopaminergic neurons, is implicated in processes involving reward, addiction, reinforcement, and learning, which are associated with a variety of neuropsychiatric disorders. Electrical stimulation of the VTA or the medial forebrain bundle and its projection target the nucleus accumbens (NAc) is reported to improve depressive symptoms in patients affected by severe, treatment-resistant major depressive disorder (MDD) and depressive-like symptoms in animal models of depression...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28303959/altered-microstructure-rather-than-morphology-in-the-corpus-callosum-after-lower-limb-amputation
#16
Zhichao Li, Chuanming Li, Lingzhong Fan, Guangyao Jiang, Jixiang Wu, Tianzi Jiang, Xuntao Yin, Jian Wang
The corpus callosum (CC) has been implicated in the reorganization of the brain following amputation. However, it is unclear which regions of the CC are involved in this process. In this study, we explored the morphometric and microstructural changes in CC subregions in patients with unilateral lower limb amputation. Thirty-eight patients and 38 age- and gender-matched normal controls were included. The CC was divided into five regions, and the area, thickness and diffusion parameters of each region were investigated...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28298886/mapping-and-analysis-of-the-connectome-of-sympathetic-premotor-neurons-in-the-rostral-ventrolateral-medulla-of-the-rat-using-a-volumetric-brain-atlas
#17
Bowen Dempsey, Sheng Le, Anita Turner, Phil Bokiniec, Radhika Ramadas, Jan G Bjaalie, Clement Menuet, Rachael Neve, Andrew M Allen, Ann K Goodchild, Simon McMullan
Spinally projecting neurons in the rostral ventrolateral medulla (RVLM) play a critical role in the generation of vasomotor sympathetic tone and are thought to receive convergent input from neurons at every level of the neuraxis; the factors that determine their ongoing activity remain unresolved. In this study we use a genetically restricted viral tracing strategy to definitively map their spatially diffuse connectome. We infected bulbospinal RVLM neurons with a recombinant rabies variant that drives reporter expression in monosynaptically connected input neurons and mapped their distribution using an MRI-based volumetric atlas and a novel image alignment and visualization tool that efficiently translates the positions of neurons captured in conventional photomicrographs to Cartesian coordinates...
2017: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/28298302/visual-and-presaccadic-activity-in-area-8ar-of-the-macaque-monkey-lateral-prefrontal-cortex
#18
Kelly R Bullock, Florian Pieper, Adam J Sachs, Julio C Martinez-Trujillo
Common trends observed in many visual and oculomotor-related cortical areas include retinotopically organized receptive and movement fields exhibiting a Gaussian shape and increasing size with eccentricity. These trends are demonstrated in the frontal eye fields (FEF), many visual areas, and the superior colliculus (SC), but have not been thoroughly characterized in prearcuate area 8Ar of the prefrontal cortex. This is important since area 8Ar, located anterior to the FEF, is more cytoarchitectonically similar to prefrontal areas than premotor areas...
March 15, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28298033/diffusion-tractography-imaging-guided-frameless-linear-accelerator-stereotactic-radiosurgical-thalamotomy-for-tremor-case-report
#19
Won Kim, Justin Sharim, Stephen Tenn, Tania Kaprealian, Yvette Bordelon, Nzhde Agazaryan, Nader Pouratian
Essential tremor and Parkinson's disease-associated tremor are extremely prevalent within the field of movement disorders. The ventral intermediate (VIM) nucleus of the thalamus has been commonly used as both a neuromodulatory and neuroablative target for the treatment of these forms of tremor. With both deep brain stimulation and Gamma Knife radiosurgery, there is an abundance of literature regarding the surgical planning, targeting, and outcomes of these methodologies. To date, there have been no reports of frameless, linear accelerator (LINAC)-based thalomotomies for tremor...
February 24, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28293484/structural-and-functional-hyperconnectivity-within-the-sensorimotor-system-in-xenomelia
#20
Jürgen Hänggi, Deborah A Vitacco, Leonie M Hilti, Roger Luechinger, Bernd Kraemer, Peter Brugger
INTRODUCTION: Xenomelia is a rare condition characterized by the persistent and compulsive desire for the amputation of one or more physically healthy limbs. We highlight the neurological underpinnings of xenomelia by assessing structural and functional connectivity by means of whole-brain connectome and network analyses of regions previously implicated in empirical research in this condition. METHODS: We compared structural and functional connectivity between 13 xenomelic men with matched controls using diffusion tensor imaging combined with fiber tractography and resting state functional magnetic resonance imaging...
March 2017: Brain and Behavior
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