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https://www.readbyqxmd.com/read/28334960/neural-mechanisms-of-reinforcement-learning-in-unmedicated-patients-with-major-depressive-disorder
#1
Marcus Rothkirch, Jonas Tonn, Stephan Köhler, Philipp Sterzer
According to current concepts, major depressive disorder is strongly related to dysfunctional neural processing of motivational information, entailing impairments in reinforcement learning. While computational modelling can reveal the precise nature of neural learning signals, it has not been used to study learning-related neural dysfunctions in unmedicated patients with major depressive disorder so far. We thus aimed at comparing the neural coding of reward and punishment prediction errors, representing indicators of neural learning-related processes, between unmedicated patients with major depressive disorder and healthy participants...
February 20, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28333586/modulation-of-context-dependent-spatiotemporal-patterns-within-packets-of-spiking-activity
#2
Miho Itoh, Timothée Leleu
Recent experiments have shown that stereotypical spatiotemporal patterns occur during brief packets of spiking activity in the cortex, and it has been suggested that top-down inputs can modulate these patterns according to the context. We propose a simple model that may explain important features of these experimental observations and is analytically tractable. The key mechanism underlying this model is that context-dependent top-down inputs can modulate the effective connection strengths between neurons because of short-term synaptic depression...
March 23, 2017: Neural Computation
https://www.readbyqxmd.com/read/28328738/inhibition-of-hippocampal-long-term-potentiation-by-high-fat-diets-is-it-related-to-an-effect-of-palmitic-acid-involving-glycogen-synthase-kinase-3
#3
Ana Contreras, Danila Del Rio, Ana Martínez, Carmen Gil, Lidia Morales, Mariano Ruiz-Gayo, Nuria Del Olmo
High-fat diets (HFD) impair hippocampal-dependent learning and memory and produce important changes in synaptic transmission by enhancing glutamate uptake, decreasing synaptic efficacy, and inhibiting plasticity mechanisms such as N-methyl-D-aspartate-mediated long-term depression (LTD) within the hippocampus. Adolescent animals seem to be particularly susceptible to the detrimental effect of HFD as dietary treatments carried out between weaning and early adulthood are much more efficient in terms of hippocampal damage that those carried out during the adult period...
March 21, 2017: Neuroreport
https://www.readbyqxmd.com/read/28324119/the-impact-of-cognitive-training-in-substance-use-disorder-the-effect-of-working-memory-training-on-impulse-control-in-methamphetamine-users
#4
Samantha J Brooks, L Wiemerslage, K H Burch, S A Maiorana, E Cocolas, H B Schiöth, K Kamaloodien, D J Stein
OBJECTIVES: Impulsivity is a vulnerability trait for poor self-regulation in substance use disorder (SUD). Working memory (WM) training improves impulsivity and self-regulation in psychiatric disorders. Here we test WM training in methamphetamine use disorder (MUD). METHODS: There are 15 MUD patients receiving inpatient treatment as usual (TAU) and 20 who additionally completed WM cognitive training (CT) and 25 healthy controls (HC). MANCOVA repeated measures analyses examined changes in impulsivity and self-regulation at baseline and after 4 weeks...
March 21, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28322777/preeclampsia-and-cognitive-impairment-later-in-life
#5
Julie A Fields, Vesna D Garovic, Michelle M Mielke, Kejal Kantarci, Muthuvel Jayachandran, Wendy M White, Alissa M Butts, Jonathan Graff-Radford, Brian D Lahr, Kent R Bailey, Virginia M Miller
BACKGROUND: Hypertension is a risk factor for cerebrovascular disease and cognitive impairment. Women who suffer hypertensive episodes during pregnancy report variable neurocognitive changes within the first decade following the affected pregnancy. However, long-term follow-up of these women into their post-menopausal years has not been conducted. OBJECTIVE: The aim of this study was to examine whether women with a history of preeclampsia were at increased risk of cognitive decline 35-40 years after the affected pregnancy...
March 17, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28322276/identifying-fast-onset-antidepressants-using-rodent-models
#6
M J Ramaker, S C Dulawa
Depression is a leading cause of disability worldwide and a major contributor to the burden of suicide. A major limitation of classical antidepressants is that 2-4 weeks of continuous treatment is required to elicit therapeutic effects, prolonging the period of depression, disability and suicide risk. Therefore, the development of fast-onset antidepressants is crucial. Preclinical identification of fast-onset antidepressants requires animal models that can accurately predict the delay to therapeutic onset. Although several well-validated assay models exist that predict antidepressant potential, few thoroughly tested animal models exist that can detect therapeutic onset...
March 21, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28321191/palmitoylethanolamide-reduces-neuropsychiatric-behaviors-by-restoring-cortical-electrophysiological-activity-in-a-mouse-model-of-mild-traumatic-brain-injury
#7
Francesca Guida, Serena Boccella, Monica Iannotta, Danilo De Gregorio, Catia Giordano, Carmela Belardo, Rosaria Romano, Enza Palazzo, Maria A Scafuro, Nicola Serra, Vito de Novellis, Francesco Rossi, Sabatino Maione, Livio Luongo
Traumatic brain injury (TBI) represents a major public health problem, which is associated with neurological dysfunction. In severe or moderate cases of TBI, in addition to its high mortality rate, subjects may encounter diverse behavioral dysfunctions. Previous reports suggest that an association between TBI and chronic pain syndromes tends to be more common in patients with mild forms of brain injury. Despite causing minimal brain damage, mild TBI (mTBI) often leads to persistent psychologically debilitating symptoms, which can include anxiety, various forms of memory and learning deficits, and depression...
2017: Frontiers in Pharmacology
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
#8
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/28315756/interleukin-4-is-a-participant-in-the-regulation-of-depressive-like-behavior
#9
Simone Wachholz, Alexandra Knorr, Leonie Mengert, Jennifer Plümper, Rainer Sommer, Georg Juckel, Astrid Friebe
Inflammatory immune activation has been frequently associated with the development of major depression. Microglia might serve as an important interface in this immune system-to-brain communication. Interleukin-4, the major Th2 type cytokine, might be protective against depression due to its ability to counter-regulate inflammation and to inhibit serotonin transporter activity. By using an Interferon-α mouse model, we show that a decreased IL-4 responsiveness of microglia was specifically related to the development of depressive-like behavior...
March 15, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28315459/dynamic-reorganization-of-intrinsic-functional-networks-in-the-mouse-brain
#10
Joanes Grandjean, Maria Giulia Preti, Thomas Aw Bolton, Michaela Buerge, Erich Seifritz, Christopher R Pryce, Dimitri Van De Ville, Markus Rudin
Functional connectivity (FC) derived from resting-state functional magnetic resonance imaging (rs-fMRI) allows for the integrative study of neuronal processes at a macroscopic level. The majority of studies to date have assumed stationary interactions between brain regions, without considering the dynamic aspects of network organization. Only recently has the latter received increased attention, predominantly in human studies. Applying dynamic FC (dFC) analysis to mice is attractive given the relative simplicity of the mouse brain and the possibility to explore mechanisms underlying network dynamics using pharmacological, environmental or genetic interventions...
March 14, 2017: NeuroImage
https://www.readbyqxmd.com/read/28315260/introduction-to-sigma-receptors-their-role-in-disease-and-as-therapeutic-targets
#11
Sylvia B Smith
This book highlights contributions from leaders in the field of sigma receptor research. Sigma receptors represent a promising, novel target for the treatment of neurodegenerative diseases, retinal degenerations, pain and substance abuse. Information is presented about tracers for molecular imaging these receptors, the newly determined crystal structure of human sigma 1 receptor and information about sigma 2 receptor. New discoveries about the role of sigma 1 receptors in cancer, pain, neuropsychiatric disorders, learning and memory, neuronal networks and depression are described...
2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28303740/neurotrophins-and-proneurotrophins
#12
Julien Gibon, Philip A Barker
Neurotrophins have been intensively studied and have multiple roles in the brain. Neurotrophins are first synthetized as proneurotrophins and then cleaved intracellularly and extracellularly. Increasing evidences demonstrate that proneurotrophins and mature neurotrophins exerts opposing role in the central nervous system. In the present review, we explore the role of nerve growth factor (NGF), brain-derived neurotrophic factor (BDNF), neurotrophin 3 (NT3), and neurotrophin 4 (NT4) and their respective proform in cellular processes related to learning and memory...
March 1, 2017: Neuroscientist: a Review Journal Bringing Neurobiology, Neurology and Psychiatry
https://www.readbyqxmd.com/read/28301775/the-microbiome-and-host-behavior
#13
Helen E Vuong, Jessica M Yano, Thomas C Fung, Elaine Y Hsiao
The microbiota is increasingly recognized for its ability to influence the development and function of the nervous system and several complex host behaviors. In this review, we discuss emerging roles for the gut microbiota in modulating host social and communicative behavior, stressor-induced behavior, and performance in learning and memory tasks. We summarize effects of the microbiota on host neurophysiology, including brain microstructure, gene expression, and neurochemical metabolism across regions of the amygdala, hippocampus, frontal cortex, and hypothalamus...
March 8, 2017: Annual Review of Neuroscience
https://www.readbyqxmd.com/read/28299411/astrocytes-and-synaptic-plasticity-in-health-and-disease
#14
REVIEW
A Singh, Wickliffe C Abraham
Activity-dependent synaptic plasticity phenomena such as long-term potentiation and long-term depression are candidate mechanisms for storing information in the brain. Regulation of synaptic plasticity is critical for healthy cognition and learning and this is provided in part by metaplasticity, which can act to maintain synaptic transmission within a dynamic range and potentially prevent excitotoxicity. Metaplasticity mechanisms also allow neurons to integrate plasticity-associated signals over time. Interestingly, astrocytes appear to be critical for certain forms of synaptic plasticity and metaplasticity mechanisms...
March 15, 2017: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/28293473/separating-generalized-anxiety-disorder-from-major-depression-using-clinical-hormonal-and-structural-mri-data-a-multimodal-machine-learning-study
#15
Kevin Hilbert, Ulrike Lueken, Markus Muehlhan, Katja Beesdo-Baum
BACKGROUND: Generalized anxiety disorder (GAD) is difficult to recognize and hard to separate from major depression (MD) in clinical settings. Biomarkers might support diagnostic decisions. This study used machine learning on multimodal biobehavioral data from a sample of GAD, MD and healthy subjects to differentiate subjects with a disorder from healthy subjects (case-classification) and to differentiate GAD from MD (disorder-classification). METHODS: Subjects with GAD (n = 19), MD without GAD (n = 14), and healthy comparison subjects (n = 24) were included...
March 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28288856/environmental-enrichment-ameliorates-chronic-immobilisation-stress-induced-spatial-learning-deficits-and-restores-the-expression-of-bdnf-vegf-gfap-and-glucocorticoid-receptors
#16
B M Shilpa, V Bhagya, G Harish, M M Srinivas Bharath, B S Shankaranarayana Rao
Severe and prolonged stress is the main environmental factor that precipitates depression, anxiety and cognitive dysfunctions. On the other hand, exposure to environmental enrichment (EE) has been shown to induce progressive plasticity in the brain and improve learning and memory in various neurological and psychiatric disorders. It is not known whether exposure to enriched environment could ameliorate chronic immobilisation stress-induced cognitive deficits and altered molecular markers. Hence, in the present study we aimed to evaluate the effect of enriched environment on chronic immobilisation stress (CIS) associated changes in spatial learning and memory, behavioural measures of anxiety, depression and molecular markers as well as structural alterations...
March 10, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28287586/introducing-clicker-training-as-a-cognitive-enrichment-for-laboratory-mice
#17
Charlotte Leidinger, Felix Herrmann, Christa Thöne-Reineke, Nadine Baumgart, Jan Baumgart
Establishing new refinement strategies in laboratory animal science is a central goal in fulfilling the requirements of Directive 2010/63/EU. Previous research determined a profound impact of gentle handling protocols on the well-being of laboratory mice. By introducing clicker training to the keeping of mice, not only do we promote the amicable treatment of mice, but we also enable them to experience cognitive enrichment. Clicker training is a form of positive reinforcement training using a conditioned secondary reinforcer, the "click" sound of a clicker, which serves as a time bridge between the strengthened behavior and an upcoming reward...
March 6, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28285823/input-specific-plasticity-and-homeostasis-at-the-drosophila-larval-neuromuscular-junction
#18
Zachary L Newman, Adam Hoagland, Krishan Aghi, Kurtresha Worden, Sabrina L Levy, Jun Ho Son, Luke P Lee, Ehud Y Isacoff
Synaptic connections undergo activity-dependent plasticity during development and learning, as well as homeostatic re-adjustment to ensure stability. Little is known about the relationship between these processes, particularly in vivo. We addressed this with novel quantal resolution imaging of transmission during locomotive behavior at glutamatergic synapses of the Drosophila larval neuromuscular junction. We find that two motor input types, Ib and Is, provide distinct forms of excitatory drive during crawling and differ in key transmission properties...
March 22, 2017: Neuron
https://www.readbyqxmd.com/read/28285165/effect-of-a-pbl-teaching-method-on-learning-about-nursing-care-for-patients-with-depression
#19
Marta Arrue, Begoña Ruiz de Alegría, Jagoba Zarandona, Itziar Hoyos Cillero
BACKGROUND: Depression is a worldwide public health problem that requires the attention of qualified health professionals. The training of skilled nurses is a challenge for nursing instructors due to the complexity of this pathology. OBJECTIVES: The aim was to analyse the declarative and argumentative knowledge acquired about depression by students receiving traditional expository instruction versus students receiving problem-based learning instruction. METHODS: Quasi-experimental study with pre-test and post-test design in experimental and control group to measure differences in the improvement of declarative and argumentative knowledge...
February 27, 2017: Nurse Education Today
https://www.readbyqxmd.com/read/28281665/valuation-in-major-depression-is-intact-and-stable-in-a-non-learning-environment
#20
Dongil Chung, Kelly Kadlec, Jason A Aimone, Katherine McCurry, Brooks King-Casas, Pearl H Chiu
The clinical diagnosis and symptoms of major depressive disorder (MDD) have been closely associated with impairments in reward processing. In particular, various studies have shown blunted neural and behavioral responses to the experience of reward in depression. However, little is known about whether depression affects individuals' valuation of potential rewards during decision-making, independent from reward experience. To address this question, we used a gambling task and a model-based analytic approach to measure two types of individual sensitivity to reward values in participants with MDD: 'risk preference,' indicating how objective values are subjectively perceived, and 'inverse temperature,' determining the degree to which subjective value differences between options influence participants' choices...
March 10, 2017: Scientific Reports
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