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Brain asymmetry

Daniel Voyer, Daniel Myles
The present report concerns two experiments extending to unimodal priming the cross-modal priming effects observed with auditory emotions by Harding and Voyer [(2016). Laterality effects in cross-modal affective priming. Laterality: Asymmetries of Body, Brain and Cognition, 21, 585-605]. Experiment 1 used binaural targets to establish the presence of the priming effect and Experiment 2 used dichotically presented targets to examine auditory asymmetries. In Experiment 1, 82 university students completed a task in which binaural targets consisting of one of 4 English words inflected in one of 4 emotional tones were preceded by binaural primes consisting of one of 4 Mandarin words pronounced in the same (congruent) or different (incongruent) emotional tones...
November 15, 2017: Laterality
Sheng-Che Yen, Laura C Olsavsky, Caitlin M Cloonan, Amelia R Llanos, Kara J Dwyer, Mohsen Nabian, Amir Bahador Farjadian
While asymmetries have been observed between the dominant and non-dominant legs, it is unclear whether they have different abilities in isometric force control (IFC). The purpose of this study was to compare ankle IFC between the legs. IFC is important for stabilization rather than object manipulation, and people typically use their non-dominant leg for stabilization tasks. Additionally, studies suggested that a limb can better acquire a motor task when the control mechanism of the task is related to what the limb is specialized for...
November 11, 2017: Human Movement Science
Adam Q Bauer, Andrew W Kraft, Grant A Baxter, Patrick W Wright, Matthew D Reisman, Annie R Bice, Jasmine J Park, Michael R Bruchas, Abraham Z Snyder, Jin-Moo Lee, Joseph P Culver
Brain connectomics has expanded from histological assessment of axonal projection connectivity (APC) to encompass resting state functional connectivity (RS-FC). RS-FC analyses are efficient for whole-brain mapping, but attempts to explain aspects of RS-FC (e.g., interhemispheric RS-FC) based on APC have been only partially successful. Neuroimaging with hemoglobin alone lacks specificity for determining how activity in a population of cells contributes to RS-FC. Wide-field mapping of optogenetically defined connectivity could provide insights into the brain's structure-function relationship...
November 9, 2017: Cerebral Cortex
Nicole Reams, Julie Anderson, Reid Perlman, Wei Li, Shaun Walters, Samuel Tideman, Chi Wang, Kelly Simon, Roberta Frigerio, Demetrius M Maraganore
OBJECTIVE: To determine whether there were differences in clinical outcomes for ioflupane I(123) injection (DaTscan) and single photon emission tomography consistent with early Parkinson's disease (PD) among individuals with a history of mild traumatic brain injury (mTBI). METHODS: We performed a case-control study among patients presenting to the Emergency Room (ER) during 2006-2013 with mTBI (cases, n = 34) or without mTBI (controls, n = 33). We performed clinical and imaging measurements in cases and controls at least 1-year post-presentation to the ER (average three years four months)...
November 13, 2017: Brain Injury: [BI]
Frédéric Laberge, Allison Smith
The habenular complex and its associated axonal pathways are often thought of as phylogenetically conserved features of the brain among vertebrates despite the fact that detailed studies of this brain region are limited to a few species. Here, the gross morphology and axonal projection pattern of the habenular complex of an anuran amphibian, the fire-bellied toad Bombina orientalis, was studied to allow comparison with the situation in other vertebrates. Axonal pathways were traced using biocytin applications in dissected brain preparations...
November 2, 2017: Brain, Behavior and Evolution
Alva Tang, Vladimir Miskovic, Ayelet Lahat, Masako Tanaka, Harriet MacMillan, Ryan J Van Lieshout, Louis A Schmidt
Resting frontal electroencephalogram (EEG) alpha asymmetry patterns reflecting different affective and motivational tendencies have been proposed as a putative mechanism underlying resilience among maltreated youth. This 2-year prospective study examined whether developmental stability of resting frontal alpha asymmetry moderated the relation between child maltreatment severity and psychopathology in female adolescents (n = 43; ages 12-16) recruited from child protection agencies. Results identified two trajectories of resting frontal asymmetry: 60...
November 12, 2017: Developmental Psychobiology
Cristina Daniela Possenti, Marco Parolini, Andrea Romano, Manuela Caprioli, Diego Rubolini, Nicola Saino
Behavioral lateralization is widespread across vertebrates. The development of lateralization is affected by both genetic and environmental factors. In birds, maternal substances in the egg can affect offspring lateralization via activational and/or organizational effects. Corticosterone affects the development of brain asymmetry, suggesting that variation in yolk corticosterone concentration may also influence post-natal behavioral lateralization, a hypothesis that has never been tested so far. In the yellow-legged gull (Larus michahellis), we increased yolk corticosterone concentration within physiological limits and analyzed the direction of lateralization of hatchlings in reverting from supine to prone position ('RTP' response) and in pecking at dummy parental bills to solicit food provisioning ('begging' response)...
November 7, 2017: Hormones and Behavior
David Córdova Bulens, Frédéric Crevecoeur, Jean-Louis Thonnard, Philippe Lefèvre
Bimanual tasks involve the coordination of both arms, which often offers redundancy in the ways a task can be completed. The distribution of control across limbs is often considered from the perspective of handedness. In this context, although there are differences across dominant and non-dominant arms during reaching control (Sainburg 2002), previous studies have shown that the brain tends to favor the dominant arm when performing bimanual tasks (Salimpour and Shadmehr 2014). However, biomechanical factors known to influence planning and control in unimanual tasks may also generate limb asymmetries in force generation, but their influence on bimanual control has remained unexplored...
November 8, 2017: Journal of Neurophysiology
Philip R Szeszko, Ek Tsoon Tan, Aziz M Uluğ, Peter B Kingsley, Juan A Gallego, Kathryn Rhindress, Anil K Malhotra, Delbert G Robinson, Luca Marinelli
BACKGROUND: Standard diffusion tensor imaging measures (e.g., fractional anisotropy; FA) are difficult to interpret in brain regions with crossing white-matter (WM) fibers. Diffusion spectrum imaging (DSI) can be used to resolve fiber crossing, but has been difficult to implement in studies of patients with psychosis given long scan times. METHODS: We used four fold accelerated compressed sensing to accelerate DSI acquisition to investigate the superior longitudinal fasciculus (SLF) in 27 (20M/7F) patients with recent onset psychosis and 23 (11M/12F) healthy volunteers...
October 28, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
Yulius Hermanto, Tadashi Sunohara, Ahmad Faried, Yasushi Takagi, Jun Takahashi, Takakuni Maki, Susumu Miyamoto
The use of human induced pluripotent stem cells (hiPSCs) eliminates the ethical issues associated with fetal or embryonic materials, thus allowing progress in cell therapy research for ischemic stroke. Strict regulation of cell therapy development requires the xeno-free condition to eliminate clinical complications. Maintenance of hiPSCs with feeder-free condition presents a higher degree of spontaneous differentiation in comparison with conventional cultures. Therefore, feeder-free derivation might be not ideal for developing transplantable hiPSC derivatives...
November 7, 2017: Journal of Neuroscience Research
Sara Roberson, Marnie E Halpern
Accumulating evidence has reinforced that the habenular region of the vertebrate dorsal forebrain is an essential integrating center, and a region strongly implicated in neurological disorders and addiction. Despite the important and diverse neuromodulatory roles the habenular nuclei play, their development has been understudied. The emphasis of this review is on the dorsal habenular nuclei of zebrafish, homologous to the medial nuclei of mammals, as recent work has revealed new information about the signaling pathways that regulate their formation...
October 26, 2017: Seminars in Cell & Developmental Biology
Robert A Hicks, Peter A Hall, William R Staines, William E McIlroy
The left and right prefrontal cortices are linked to networks that control approach and withdrawal motivation, respectively. The relationship between activity in the left and right prefrontal activity is used to assess brain states and specifically their link to motivational behaviours and tendencies. The most common measure used in this context is called the frontal alpha asymmetry (FAA), which compares alpha (8-13Hz) power at each region. Interestingly, research shows that FAA is influenced by aerobic exercise by increasing relative left prefrontal cortex activity...
November 2, 2017: Biological Psychology
Nathalie Tzourio-Mazoyer, Fabrice Crivello, Bernard Mazoyer
We investigated the association between the left planum temporale (PT) surface area or asymmetry and the hemispheric or regional functional asymmetries during language production and perception tasks in 287 healthy adults (BIL&GIN) who were matched for sex and handedness. The measurements of the PT surface area were performed after manually delineating the region using brain magnetic resonance images (MRI) and considering the Heschl's gyrus (HG) duplication pattern; the measurements either included (PTtot) or did not include (PTpost) the second gyrus...
November 3, 2017: Brain Structure & Function
Figen Govsa, Asli Beril Karakas, Mehmet Asim Ozer, Cenk Eraslan
BACKGROUND: Despite significant improvement in clinical care, operative strategies, and technology, neurosurgery is still risky, and optimal preoperative planning and anatomical assessment are necessary to minimize risks of serious complications. Our purpose is to document of dural venous sinuses (DVS) and its variations were identified during routine 3D venography created through three dimensional (3D) models for teaching and learning of complex cerebral anatomy. METHODS: 3D models of the DVS networks were printed...
October 31, 2017: World Neurosurgery
Judith Schmitz, Gerlinde A S Metz, Onur Güntürkün, Sebastian Ocklenburg
Hemispheric asymmetries represent one of the major organizational principles in vertebrate neurobiology, but their molecular determinants are not well understood. For handedness, the most widely investigated form of hemispheric asymmetries in humans, single gene explanations have been the most popular ontogenetic model in the past. However, molecular genetic studies revealed only few specific genes that explain a small fraction of the phenotypic variance. In contrast, family studies indicated heritability of up to 0...
October 31, 2017: Progress in Neurobiology
Jae Hyun Park, Chun Soo Kim, Kyoung Sook Won, Jungsu S Oh, Jae Seung Kim, Hae Won Kim
METHODS: Thirty-six VLBW infants who underwent F-18 fluorodeoxyglucose (F-18 FDG) brain PET and MRI were prospectively enrolled, while infants with evidence of parenchymal brain injury on MRI were excluded. The regional glucose metabolic ratio and asymmetry index were calculated. The asymmetry index more than 10% (right > left asymmetry) or less than -10% (left > right asymmetry) were defined as abnormal. Regional cerebral glucose metabolism were compared between right and left cerebral hemispheres, and between the following subgroups: multiple gestations, premature rupture of membrane, bronchopulmonary dysplasia, and low-grade intraventricular hemorrhage...
2017: PloS One
Marlieke Scholten, Johannes Klemt, Melanie Heilbronn, Christian Plewnia, Bastiaan R Bloem, Friedemann Bunjes, Rejko Krüger, Alireza Gharabaghi, Daniel Weiss
Conventional subthalamic deep brain stimulation for Parkinson's disease (PD) presumably modulates the spatial component of gait. However, temporal dysregulation of gait is one of the factors that is tightly associated with freezing of gait (FOG). Temporal locomotor integration may be modulated differentially at distinct levels of the basal ganglia. Owing to its specific descending brainstem projections, stimulation of the substantia nigra pars reticulata (SNr) area might modulate spatial and temporal parameters of gait differentially compared to standard subthalamic nucleus (STN) stimulation...
2017: Frontiers in Neurology
Hyuk Je Lee, Ralf F Schneider, Tereza Manousaki, Ji Hyoun Kang, Etienne Lein, Paolo Franchini, Axel Meyer
Lateralized behavior ('handedness') is unusual, but consistently found across diverse animal lineages, including humans. It is thought to reflect brain anatomical and/or functional asymmetries, but its neuro-molecular mechanisms remain largely unknown. Lake Tanganyika scale-eating cichlid fish, Perissodus microlepis show pronounced asymmetry in their jaw morphology as well as handedness in feeding behavior - feeding scales preferentially only from one or the other side of their victims. This makes them an ideal model in which to investigate potential laterality in neuroanatomy and transcription in the brain in relation to behavioral handedness...
October 24, 2017: Genome Biology and Evolution
I V Karpova, E R Bychkov, V V Marysheva, V V Mikheev, P D Shabanov
The effects of intranasal administration of oxytocin on the levels and metabolism of monoamines in symmetrical structures of the brain of white outbred mice kept under conditions of long-term social isolation were studied by HPLC. Disappearance of initial right-sided asymmetry in the content of dopamine metabolites in the striatum, increased 5-hydroxyacetic acid content in the right striatum, and disappearance of the initial left-sided asymmetry in serotonin level in the cortex were noted; we also found a decrease in norepinephrine content in the left hippocampus with appearance of asymmetry and higher content in the right olfactory tubercle...
October 2017: Bulletin of Experimental Biology and Medicine
Xiaoli Guo, Wenqing Wu, Shanbao Tong
Disturbance of interhemispheric interactions after stroke has been widely reported. However, the dynamic change in the hyperacute stage of stroke remains to be elucidated. In this study, interhemispheric interactions and brain asymmetry in the early hours after infarction were investigated in animals from the aspect of nonlinear interdependences using bilateral EEG recordings. Both the right-to-left and the left-to-right hemispheric interdependences were impaired after unilateral stroke, with a significant decrease in the first two hours and a low level in the following twenty-two hours...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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