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Motivation and brain

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https://www.readbyqxmd.com/read/29780197/trafic-fiber-tract-classification-using-deep-learning
#1
Prince D Ngattai Lam, Gaetan Belhomme, Jessica Ferrall, Billie Patterson, Martin Styner, Juan C Prieto
We present TRAFIC, a fully automated tool for the labeling and classification of brain fiber tracts. TRAFIC classifies new fibers using a neural network trained using shape features computed from previously traced and manually corrected fiber tracts. It is independent from a DTI Atlas as it is applied to already traced fibers. This work is motivated by medical applications where the process of extracting fibers from a DTI atlas, or classifying fibers manually is time consuming and requires knowledge about brain anatomy...
February 2018: Proceedings of SPIE
https://www.readbyqxmd.com/read/29779747/art-energy-and-the-brain
#2
Robert Pepperell
Recent years have seen a growing interest among neuroscientists and vision scientists in art and aesthetics, exemplifying a more general trend toward interdisciplinary integration in the arts, humanities, and sciences. However, true art-science integration remains a distant prospect due to fundamental differences in outlook and approach between disciplines. I consider two great challenges for any project designed to explain the role of the brain in art appreciation. First, scientists and artists need to identify common ground, common questions, and a shared motivation for inquiry...
2018: Progress in Brain Research
https://www.readbyqxmd.com/read/29775144/the-economic-consequences-of-neurosurgical-disease-in-low-and-middle-income-countries
#3
Niclas Rudolfson, Michael C Dewan, Kee B Park, Mark G Shrime, John G Meara, Blake C Alkire
OBJECTIVE The objective of this study was to estimate the economic consequences of neurosurgical disease in low- and middle-income countries (LMICs). METHODS The authors estimated gross domestic product (GDP) losses and the broader welfare losses attributable to 5 neurosurgical disease categories in LMICs using two distinct economic models. The value of lost output (VLO) model projects annual GDP losses due to neurosurgical disease during 2015-2030, and is based on the WHO's "Projecting the Economic Cost of Ill-health" tool...
May 18, 2018: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29769511/an-elderly-lady-with-neurobrucellosis-and-multiple-co-morbid-conditions
#4
M N Islam
Neurobrucellosis is a rare (1.7-7.0% of prevalence) neurological complication of brucellosis which has neither a typical clinical picture nor specific cerebrospinal fluid (CSF) findings and mimics other neurological disorders leading to clinical diagnostic dilemmas. This study describes one elderly patient of neurobrucellosis with fever, irrelevant behavior, sweating, fatigue, drowsiness, neck stiffness inability to speak and reduced activity for about 10 days hailing from Beanibazar, Sylhet, Bangladesh admitted in Mount Adora Hospital, Sylhet, Bangladesh on 16th October 2016...
April 2018: Mymensingh Medical Journal: MMJ
https://www.readbyqxmd.com/read/29763744/characterization-of-electroencephalography-signals-for-estimating-saliency-features-in-videos
#5
Zhen Liang, Yasuyuki Hamada, Shigeyuki Oba, Shin Ishii
Understanding the functions of the visual system has been one of the major targets in neuroscience formany years. However, the relation between spontaneous brain activities and visual saliency in natural stimuli has yet to be elucidated. In this study, we developed an optimized machine learning-based decoding model to explore the possible relationships between the electroencephalography (EEG) characteristics and visual saliency. The optimal features were extracted from the EEG signals and saliency map which was computed according to an unsupervised saliency model ( Tavakoli and Laaksonen, 2017)...
May 12, 2018: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/29761060/loss-anticipation-and-outcome-during-the-monetary-incentive-delay-task-a-neuroimaging-systematic-review-and-meta-analysis
#6
Jules R Dugré, Alexandre Dumais, Nathalie Bitar, Stéphane Potvin
Background: Reward seeking and avoidance of punishment are key motivational processes. Brain-imaging studies often use the Monetary Incentive Delay Task (MIDT) to evaluate motivational processes involved in maladaptive behavior. Although the bulk of research has been done on the MIDT reward events, little is known about the neural basis of avoidance of punishment. Therefore, we conducted a meta-analysis of brain activations during anticipation and receipt of monetary losses in healthy controls...
2018: PeerJ
https://www.readbyqxmd.com/read/29760527/prefrontal-cortex-as-a-meta-reinforcement-learning-system
#7
Jane X Wang, Zeb Kurth-Nelson, Dharshan Kumaran, Dhruva Tirumala, Hubert Soyer, Joel Z Leibo, Demis Hassabis, Matthew Botvinick
Over the past 20 years, neuroscience research on reward-based learning has converged on a canonical model, under which the neurotransmitter dopamine 'stamps in' associations between situations, actions and rewards by modulating the strength of synaptic connections between neurons. However, a growing number of recent findings have placed this standard model under strain. We now draw on recent advances in artificial intelligence to introduce a new theory of reward-based learning. Here, the dopamine system trains another part of the brain, the prefrontal cortex, to operate as its own free-standing learning system...
May 14, 2018: Nature Neuroscience
https://www.readbyqxmd.com/read/29760183/neural-mechanisms-underlying-individual-differences-in-control-averse-behavior
#8
Sarah Rudorf, Katrin Schmelz, Thomas Baumgartner, Roland Wiest, Urs Fischbacher, Daria Knoch
When another person tries to control one's decisions, some people might comply, but many will feel the urge to act against that control. This control aversion can lead to suboptimal decisions and it affects social interactions in many societal domains. To date, however, it has been unclear what drives individual differences in control-averse behavior. Here, we address this issue by measuring brain activity with fMRI while healthy female and male human participants make choices that are either free or controlled by another person, with real consequences to both interaction partners...
May 14, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29757478/varying-the-rate-of-intravenous-cocaine-infusion-influences-the-temporal-dynamics-of-both-drug-and-dopamine-concentrations-in-the-striatum
#9
Ellie-Anna Minogianis, Waqqas M Shams, Omar S Mabrouk, Jenny-Marie T Wong, Wayne G Brake, Robert T Kennedy, Patrick du Souich, Anne-Noël Samaha
The faster drugs of abuse reach the brain, the greater is the risk of addiction. Even small differences in the rate of drug delivery can influence outcome. Infusing cocaine intravenously over 5 versus 90-100 seconds promotes sensitization to the psychomotor and incentive motivational effects of the drug and preferentially recruits mesocorticolimbic regions. It remains unclear whether these effects are due to differences in how fast and/or how much drug reaches the brain. Here, we predicted that varying the rate of intravenous cocaine infusion between 5-90 seconds produces different rates of rise of brain drug concentrations, while producing similar peak concentrations...
May 14, 2018: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29757269/combining-quantitative-food-intake-assays-and-forcibly-activating-neurons-to-study-appetite-in-drosophila
#10
Lifen Jiang, Yinpeng Zhan, Yan Zhu
Food consumption is under the tight control of the brain, which integrates the physiological status, palatability, and nutritional contents of the food, and issues commands to start or stop feeding. Deciphering the processes underlying the decision-making of timely and moderate feeding carries major implications in our understanding of physiological and psychological disorders related to feeding control. Simple, quantitative, and robust methods are required to measure the food ingestion of animals after experimental manipulation, such as forcibly increasing the activities of certain target neurons...
April 24, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29754307/effects-of-cocaine-self-administration-and-its-extinction-on-the-rat-brain-cannabinoid-cb1-and-cb2-receptors
#11
Beata Bystrowska, Małgorzata Frankowska, Irena Smaga, Lucyna Pomierny-Chamioło, Małgorzata Filip
The aim of this study was to evaluate changes in the expression of cannabinoid type 1 (CB1) and 2 (CB2) receptor proteins in several brain regions in rats undergoing cocaine self-administration and extinction training. We used a triad-yoked procedure to distinguish between the motivational and pharmacological effects of cocaine. Using immunohistochemistry, we observed a significant decrease in CB1 receptor expression in the prefrontal cortex, dorsal striatum, and the basolateral and basomedial amygdala following cocaine (0...
May 12, 2018: Neurotoxicity Research
https://www.readbyqxmd.com/read/29753942/magnetic-resonance-imaging-technology-bridging-the-gap-between-noninvasive-human-imaging-and-optical-microscopy
#12
REVIEW
Jonathan R Polimeni, Lawrence L Wald
Technological advances in Magnetic Resonance Imaging (MRI) have provided substantial gains in the sensitivity and specificity of functional neuroimaging. Mounting evidence demonstrates that the hemodynamic changes utilized in functional MRI can be far more spatially and thus neuronally specific than previously believed. This has motivated a push toward novel, high-resolution MR imaging strategies that can match this biological resolution limit while recording from the entire human brain. Although sensitivity increases are a necessary component, new MR encoding technologies are required to convert improved sensitivity into higher resolution...
May 10, 2018: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/29753886/cocaine-impairs-serial-feature-negative-learning-and-blood-brain-barrier-integrity
#13
Terry Davidson, Sara Hargrave, David Kearns, Matthew Clasen, Sabrina Jones, Alison Wakeford, Camille Sample, Anthony Riley
Previous research has shown that diets high in fat and sugar [a.k.a., Western diets (WD)] can impair performance of rats on hippocampal-dependent learning and memory problems, an effect that is accompanied by selective increases in hippocampal blood brain barrier (BBB) permeability. Based on these types of findings, it has been proposed that overeating of a WD (and its resulting obesity) may be, in part, a consequence of impairments in these anatomical substrates and cognitive processes. Given that drug use (and addiction) represents another behavioral excess, the present experiments assessed if similar outcomes might occur with drug exposure by evaluating the effects of cocaine administration on hippocampal-dependent memory and on the integrity of the BBB...
May 10, 2018: Pharmacology, Biochemistry, and Behavior
https://www.readbyqxmd.com/read/29752691/analytical-modelling-of-temperature-effects-on-an-ampa-type-synapse
#14
Dominik S Kufel, Grzegorz M Wojcik
It was previously reported, that temperature may significantly influence neural dynamics on the different levels of brain function. Thus, in computational neuroscience, it would be useful to make models scalable for a wide range of various brain temperatures. However, lack of experimental data and an absence of temperature-dependent analytical models of synaptic conductance does not allow to include temperature effects at the multi-neuron modeling level. In this paper, we propose a first step to deal with this problem: A new analytical model of AMPA-type synaptic conductance, which is able to incorporate temperature effects in low-frequency stimulations...
May 11, 2018: Journal of Computational Neuroscience
https://www.readbyqxmd.com/read/29751228/prenatal-nicotine-exposure-alters-postsynaptic-ampa-receptors-and-glutamate-neurotransmission-within-the-laterodorsal-tegmentum-ldt-of-juvenile-mice
#15
Filip S Polli, Kristi A Kohlmeier
Despite dissemination of information regarding the harm on fetal development of smoking while pregnant, the number of pregnancies associated with nicotine exposure appears to have stagnated. Presence of nicotine during neural formulation is associated with a higher susceptibility of drug dependence, suggesting an altered development of neurons in circuits involved in saliency and motivation. The laterodorsal tegmental nucleus (LDT) plays a role in coding stimuli valence via afferents to mesolimbic nuclei. Accordingly, alterations in development of neural mechanisms in the LDT could be involved in vulnerability to drug dependency...
April 25, 2018: Neuropharmacology
https://www.readbyqxmd.com/read/29751094/the-interest-of-women-with-mayer-rokitansky-k%C3%A3-ster-hauser-syndrome-and-laparoscopic-vecchietti-neovagina-in-uterus-transplantation
#16
Roman Chmel, Marta Novackova, Zlatko Pastor, Jiri Fronek
STUDY OBJECTIVE: The goal of this study was to assess a group of Mayer-Rokitansky-Küster-Hauser syndrome (MRKH) women with surgically created neovaginas in the interest of uterus transplantation (UTx) and to recruit the first group of applicants for a uterus transplant trial. DESIGN: and Setting: This is an original prospective study using semistructured interviews. PARTICIPANTS: A study group of 50 MRKH syndrome women with Vecchietti neovaginas was recruited by letter of invitation...
May 8, 2018: Journal of Pediatric and Adolescent Gynecology
https://www.readbyqxmd.com/read/29751058/imaging-brain-tumour-microstructure
#17
Markus Nilsson, Elisabet Englund, Filip Szczepankiewicz, Danielle van Westen, Pia C Sundgren
Imaging is an indispensable tool for brain tumour diagnosis, surgical planning, and follow-up. Definite diagnosis, however, often demands histopathological analysis of microscopic features of tissue samples, which have to be obtained by invasive means. A non-invasive alternative may be to probe corresponding microscopic tissue characteristics by MRI, or so called 'microstructure imaging'. The promise of microstructure imaging is one of 'virtual biopsy' with the goal to offset the need for invasive procedures in favour of imaging that can guide pre-surgical planning and can be repeated longitudinally to monitor and predict treatment response...
May 8, 2018: NeuroImage
https://www.readbyqxmd.com/read/29751057/using-expectancy-theory-to-quantitatively-dissociate-the-neural-representation-of-motivation-from-its-influential-factors-in-the-human-brain-an-fmri-study
#18
Akshay Kohli, David N Blitzer, Ray W Lefco, Joseph W Barter, M Ryan Haynes, Sam A Colalillo, Martina Ly, Caroline F Zink
Researchers have yet to apply a formal operationalized theory of motivation to neurobiology that would more accurately and precisely define neural activity underlying motivation. We overcome this challenge with the novel application of the Expectancy Theory of Motivation to human fMRI to identify brain activity that explicitly reflects motivation. Expectancy Theory quantitatively describes how individual constructs determine motivation by defining motivation force as the product of three variables: expectancy - belief that effort will better performance; instrumentality - belief that successful performance leads to particular outcome, and valence - outcome desirability...
May 8, 2018: NeuroImage
https://www.readbyqxmd.com/read/29750195/utilizing-sensory-prediction-errors-for-movement-intention-decoding-a-new-methodology
#19
Gowrishankar Ganesh, Keigo Nakamura, Supat Saetia, Alejandra Mejia Tobar, Eiichi Yoshida, Hideyuki Ando, Natsue Yoshimura, Yasuharu Koike
We propose a new methodology for decoding movement intentions of humans. This methodology is motivated by the well-documented ability of the brain to predict sensory outcomes of self-generated and imagined actions using so-called forward models. We propose to subliminally stimulate the sensory modality corresponding to a user's intended movement, and decode a user's movement intention from his electroencephalography (EEG), by decoding for prediction errors-whether the sensory prediction corresponding to a user's intended movement matches the subliminal sensory stimulation we induce...
May 2018: Science Advances
https://www.readbyqxmd.com/read/29745289/the-experience-of-return-to-work-in-individuals-with-traumatic-brain-injury-tbi-a-qualitative-study
#20
Lauren Libeson, Marina Downing, Pamela Ross, Jennie Ponsford
Traumatic Brain Injury (TBI) is a leading cause of disability in young people, with return to work (RTW) a major goal of recovery. This qualitative study aimed to understand the RTW experience of individuals with TBI who received comprehensive vocational rehabilitation, and to identify facilitating and limiting factors in the RTW process. Semi-structured interviews were conducted with 15 individuals (mean age = 47.33 years) approximately 4.5 years post-injury, of whom 14 had moderate to severe TBI. Twelve individuals had successfully returned to work...
May 10, 2018: Neuropsychological Rehabilitation
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