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Reward dysfunction

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https://www.readbyqxmd.com/read/28324169/roles-of-centromedian-parafascicular-nuclei-of-thalamus-and-cholinergic-interneurons-in-the-dorsal-striatum-in-associative-learning-of-environmental-events
#1
REVIEW
Ko Yamanaka, Yukiko Hori, Takafumi Minamimoto, Hiroshi Yamada, Naoyuki Matsumoto, Kazuki Enomoto, Toshihiko Aosaki, Ann M Graybiel, Minoru Kimura
The thalamus provides a massive input to the striatum, but despite accumulating evidence, the functions of this system remain unclear. It is known, however, that the centromedian (CM) and parafascicular (Pf) nuclei of the thalamus can strongly influence particular striatal neuron subtypes, notably including the cholinergic interneurons of the striatum (CINs), key regulators of striatal function. Here, we highlight the thalamostriatal system through the CM-Pf to striatal CINs. We consider how, by virtue of the direct synaptic connections of the CM and PF, their neural activity contributes to the activity of CINs and striatal projection neurons (SPNs)...
March 21, 2017: Journal of Neural Transmission
https://www.readbyqxmd.com/read/28315981/the-development-of-severe-and-chronic-violence-among-youth-the-role-of-psychopathic-traits-and-reward-processing
#2
Dennis E Reidy, Elizabeth Krusemark, David S Kosson, Megan C Kearns, Joanne Smith-Darden, Kent A Kiehl
Psychopathic traits are a manifestation of a personality pathology that comprises a core affective-interpersonal dysfunction (callous-unemotional traits) and an impulsive-antisocial behavioral component. Of particular importance, psychopathic traits are associated with the perpetration of some of the most severe acts of violence, and they appear to indicate a subset of youth at risk for earlier onset, greater frequency, and persistence of violent offending. Although these youth represent a minority of the population, they commit a significant proportion of the violence in the general community...
March 18, 2017: Child Psychiatry and Human Development
https://www.readbyqxmd.com/read/28301764/reward-processing-neuroeconomics-and-psychopathology
#3
David H Zald, Michael T Treadway
Abnormal reward processing is a prominent transdiagnostic feature of psychopathology. The present review provides a framework for considering the different aspects of reward processing and their assessment, and highlights recent insights from the field of neuroeconomics that may aid in understanding these processes. Although altered reward processing in psychopathology has often been treated as a general hypo- or hyperresponsivity to reward, increasing data indicate that a comprehensive understanding of reward dysfunction requires characterization within more specific reward-processing domains, including subjective valuation, discounting, hedonics, reward anticipation and facilitation, and reinforcement learning...
March 15, 2017: Annual Review of Clinical Psychology
https://www.readbyqxmd.com/read/28285734/behavioral-predictors-of-alcohol-drinking-in-a-neurodevelopmental-rat-model-of-schizophrenia-and-co-occurring-alcohol-use-disorder
#4
Jibran Y Khokhar, Travis P Todd
Alcohol use disorder commonly occurs in patients with schizophrenia and contributes greatly to its morbidity. Unfortunately, the neural and behavioral underpinnings of alcohol drinking in these patients are not well understood. In order to begin to understand the cognitive and reward-related changes that may contribute to alcohol drinking, this study was designed to address: 1) latent inhibition; 2) conditioning; and 3) extinction of autoshaping in a neurodevelopmental rat model with relevance to co-occurring schizophrenia and alcohol use disorders, the neonatal ventral hippocampal lesioned (NVHL) rat...
March 9, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28283562/effort-based-reinforcement-processing-and-functional-connectivity-underlying-amotivation-in-medicated-patients-with-depression-and-schizophrenia
#5
Ho Il Park, Boung Chul Lee, Jae-Jin Kim, Joong Il Kim, Min-Seung Koo
Amotivation is a common phenotype of major depressive disorder and schizophrenia which are clinically distinct disorders. Effective treatment targets and strategies can be discovered by examining the dopaminergic reward network function underlying amotivation between these disorders. We conducted a functional MRI study in healthy human participants and medicated patients with depression and schizophrenia using an effort-based reinforcement task. We examined regional activations related to reward type (positive and negative reinforcement), effort level, and their composite value as well as resting-state functional connectivities within the meso-striatal-prefrontal pathway...
March 10, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28277342/functional-neuroimaging-in-obesity
#6
Laura Patriarca, Greta Magerowski, Miguel Alonso-Alonso
PURPOSE OF REVIEW: This review examines recent advances in the use of functional neuroimaging to study human obesity, a field that is rapidly expanding and continues to be of paramount importance for a better understanding of the pathogenesis of this condition. With rising levels of obesity worldwide and limited therapeutic options, there is a great need for the development of new solutions that can benefit patients. RECENT FINDINGS: Studies that utilize functional neuroimaging are beginning to shed light on the nature of behavioral and neurocognitive dysfunctions previously identified in individuals with obesity...
March 8, 2017: Current Opinion in Endocrinology, Diabetes, and Obesity
https://www.readbyqxmd.com/read/28274677/pediatric-irritability-a-systems-neuroscience-approach
#7
REVIEW
Ellen Leibenluft
Irritability, defined as an increased propensity to exhibit increased anger relative to one's peers, is a common clinical problem in youth. Irritability can be conceptualized as aberrant responses to frustration (where frustration is the emotional response to blocked goal attainment) and/or aberrant 'approach' responses to threat. Irritable youth show hyper-reactivity to threat mediated by dysfunction in amygdala, medial prefrontal cortex (mPFC), anterior cingulate cortex (ACC), insula, striatum, and association cortex...
March 5, 2017: Trends in Cognitive Sciences
https://www.readbyqxmd.com/read/28273126/struggling-toward-reward-recent-experience-of-anhedonia-interacts-with-motivation-to-predict-reward-pursuit-in-the-face-of-a-stressful-manipulation
#8
Jessica Bryant, E Samuel Winer, Taban Salem, Michael R Nadorff
Anhedonia, or the loss of interest and/or pleasure, is a core symptom of depression. Individuals experiencing anhedonia have difficulty motivating themselves to pursue rewarding stimuli, which can result in dysfunction. Action orientation is a motivational factor that might interact with anhedonia to potentially buffer against this dysfunction, as action-oriented individuals upregulate positive affect to quickly motivate themselves to complete goals in the face of stress. The Effort-Expenditure for Rewards Task (EEfRT) is a promising new method for examining differences in motivation in individuals experiencing anhedonia...
2017: PloS One
https://www.readbyqxmd.com/read/28271452/testing-the-dual-pathway-model-of-adhd-in-obesity-a-pilot-study
#9
Saskia Van der Oord, Caroline Braet, Samuele Cortese, Laurence Claes
INTRODUCTION: There may be shared neuropsychological dysfunctions in ADHD and obesity. This study tested a neuropsychological model of ADHD (reward/executive dysfunctioning) in individuals with obesity. Furthermore, the association between co-morbid binge eating and reward/executive dysfunction was explored. METHODS: Reward/executive dysfunctioning was assessed using both neuropsychological measures and questionnaires in individuals (aged 17-68) with obesity (N = 39; mean BMI = 39...
March 7, 2017: Eating and Weight Disorders: EWD
https://www.readbyqxmd.com/read/28270751/understanding-the-role-of-gpcr-heteroreceptor-complexes-in-modulating-the-brain-networks-in-health-and-disease
#10
REVIEW
Dasiel O Borroto-Escuela, Jens Carlsson, Patricia Ambrogini, Manuel Narváez, Karolina Wydra, Alexander O Tarakanov, Xiang Li, Carmelo Millón, Luca Ferraro, Riccardo Cuppini, Sergio Tanganelli, Fang Liu, Malgorzata Filip, Zaida Diaz-Cabiale, Kjell Fuxe
The introduction of allosteric receptor-receptor interactions in G protein-coupled receptor (GPCR) heteroreceptor complexes of the central nervous system (CNS) gave a new dimension to brain integration and neuropsychopharmacology. The molecular basis of learning and memory was proposed to be based on the reorganization of the homo- and heteroreceptor complexes in the postjunctional membrane of synapses. Long-term memory may be created by the transformation of parts of the heteroreceptor complexes into unique transcription factors which can lead to the formation of specific adapter proteins...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28270566/orbitofrontal-neuroadaptations-and-cross-species-synaptic-biomarkers-in-heavy-drinking-macaques
#11
Sudarat Nimitvilai, Joachim D Uys, John J Woodward, Patrick K Randall, Lauren E Ball, Robert W Williams, Byron C Jones, Lu Lu, Kathleen A Grant, Patrick J Mulholland
Cognitive impairments, uncontrolled drinking, and neuropathological cortical changes characterize alcohol use disorder. Dysfunction of the orbitofrontal cortex (OFC), a critical cortical sub-region that controls learning, decision-making, and prediction of reward outcomes, contributes to executive cognitive function deficits in alcoholics. Electrophysiological and quantitative synaptomics techniques were used to test the hypothesis that heavy drinking produces neuroadaptations in the macaque OFC. Integrative bioinformatics and reverse genetic approaches were used to identify and validate synaptic proteins with novel links to heavy drinking in BXD mice...
March 7, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28259721/neuroendocrinology-and-brain-imaging-of-reward-in-eating-disorders-a-possible-key-to-the-treatment-of-anorexia-nervosa-and-bulimia-nervosa
#12
REVIEW
Alessio Maria Monteleone, Giovanni Castellini, Umberto Volpe, Valdo Ricca, Lorenzo Lelli, Palmiero Monteleone, Mario Maj
Anorexia nervosa and bulimia nervosa are severe eating disorders whose etiopathogenesis is still unknown. Clinical features suggest that eating disorders may develop as reward-dependent syndromes, since eating less food is perceived as rewarding in anorexia nervosa while consumption of large amounts of food during binge episodes in bulimia nervosa aims at reducing the patient's negative emotional states. Therefore, brain reward mechanisms have been a major focus of research in the attempt to contribute to the comprehension of the pathophysiology of these disorders...
March 1, 2017: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/28257849/viral-vector-strategies-for-investigating-midbrain-dopamine-circuits-underlying-motivated-behaviors
#13
REVIEW
Daniel F Cardozo Pinto, Stephan Lammel
Midbrain dopamine (DA) neurons have received significant attention in brain research because of their central role in reward processing and their dysfunction in neuropsychiatric disorders such as Parkinson's disease, drug addiction, depression and schizophrenia. Until recently, it has been thought that DA neurons form a homogeneous population whose primary function is the computation of reward prediction errors. However, through the implementation of viral vector strategies, an unexpected complexity and diversity has been revealed at the anatomical, molecular and functional level...
February 28, 2017: Pharmacology, Biochemistry, and Behavior
https://www.readbyqxmd.com/read/28245177/%C3%AE-9-tetrahydrocannabinol-decreases-willingness-to-exert-cognitive-effort-in-male-rats
#14
Mason M Silveira, Wendy K Adams, Maria Morena, Matthew N Hill, Catharine A Winstanley
BACKGROUND: Acceptance of cannabis use is growing. However, prolonged use is associated with diminished psychosocial outcomes, potentially mediated by drug-induced cognitive impairments. Δ(9)-Tetrahydrocannabinol (THC) is the main psychoactive ingredient in cannabis, yet other phytocannabinoids in the plant, such as cannabidiol (CBD), have unique properties. Given that CBD can modulate the undesirable effects of THC, therapeutic agents, such as nabiximols, contain higher CBD:THC ratios than illicit marijuana...
March 2017: Journal of Psychiatry & Neuroscience: JPN
https://www.readbyqxmd.com/read/28228742/sleep-dependent-consolidation-of-rewarded-behavior-is-diminished-in-children-with-attention-deficit-hyperactivity-disorder-and-a-comorbid-disorder-of-social-behavior
#15
Christian D Wiesner, Ina Molzow, Alexander Prehn-Kristensen, Lioba Baving
Children suffering from attention-deficit hyperactivity disorder (ADHD) often also display impaired learning and memory. Previous research has documented aberrant reward processing in ADHD as well as impaired sleep-dependent consolidation of declarative memory. We investigated whether sleep also fosters the consolidation of behavior learned by probabilistic reward and whether ADHD patients with a comorbid disorder of social behavior show deficits in this memory domain, too. A group of 17 ADHD patients with comorbid disorders of social behavior aged 8-12 years and healthy controls matched for age, IQ, and handedness took part in the experiment...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28228718/current-concepts-on-the-physiopathological-relevance-of-dopaminergic-receptors
#16
REVIEW
Ada Ledonne, Nicola B Mercuri
Dopamine (DA) is a key neurotransmitter modulating essential functions of the central nervous system (CNS), like voluntary movement, reward, several cognitive functions and goal-oriented behaviors. The factual relevance of DAergic transmission can be well appreciated by considering that its dysfunction is recognized as a core alteration in several devastating neurological and psychiatric disorders, including Parkinson's disease (PD) and associated movement disorders, as well as, schizophrenia, bipolar disorder, attention deficit hyperactivity disorder (ADHD) and addiction...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28217446/the-dangers-of-sexual-enhancement-supplements-and-counterfeit-drugs-to-treat-erectile-dysfunction
#17
REVIEW
Jason Chiang, Faysal A Yafi, Philip J Dorsey, Wayne J G Hellstrom
Counterfeit phosphodiesterase-5 inhibitors (PDE-5i) are an increasing problem. Already in widespread use, the market for PDE-5i is steadily growing as the population ages. Counterfeiters are taking advantage of this growing market by developing illicit and counterfeit PDE-5i products. Many factors are contributing to the rapid growth of the illicit market, such as the low risk of prosecution, potentially high financial reward, and ease of distribution via Internet pharmacies. Consumers of illicit PDE-5i often do not realize they are using counterfeit products and placing themselves at an unnecessary health risk...
February 2017: Translational Andrology and Urology
https://www.readbyqxmd.com/read/28216068/stages-of-dysfunctional-decision-making-in-addiction
#18
REVIEW
Antonio Verdejo-Garcia, Trevor T-J Chong, Julie C Stout, Murat Yücel, Edythe D London
Drug use is a choice with immediate positive outcomes, but long-term negative consequences. Thus, the repeated use of drugs in the face of negative consequences suggests dysfunction in the cognitive mechanisms underpinning decision-making. This cognitive dysfunction can be mapped into three stages: the formation of preferences involving valuation of decision options; choice implementation including motivation, self-regulation and inhibitory processes; and feedback processing implicating reinforcement learning...
February 16, 2017: Pharmacology, Biochemistry, and Behavior
https://www.readbyqxmd.com/read/28209215/the-relevance-of-goal-orientation-for-motivation-in-high-versus-low-proneness-to-negative-symptoms
#19
Björn Schlier, Maike Engel, Anne-Katharina Fladung, Anja Fritzsche, Tania M Lincoln
BACKGROUND: The psychological mechanisms of why individuals with negative symptoms fail to initiate and perform goal-directed behavior are not well understood. Drawing on the reward-sensitivity and expectancy-value theories, we investigate whether negative symptom-like experiences (NSLE) are associated with generating less approach goals (aimed at reaching a positive outcome) and more avoidance goals (aimed at avoiding a negative outcome) and whether this type of goal-orientation explains motivational deficits (i...
June 2017: Journal of Behavior Therapy and Experimental Psychiatry
https://www.readbyqxmd.com/read/28202786/dopamine-modulates-adaptive-prediction-error-coding-in-the-human-midbrain-and-striatum
#20
Kelly M J Diederen, Hisham Ziauddeen, Martin D Vestergaard, Tom Spencer, Wolfram Schultz, Paul C Fletcher
Learning to optimally predict rewards requires agents to account for fluctuations in reward value. Recent work suggests that individuals can efficiently learn about variable rewards through adaptation of the learning rate, and coding of prediction errors relative to reward variability. Such adaptive coding has been linked to midbrain dopamine neurons in nonhuman primates, and evidence in support for a similar role of the dopaminergic system in humans is emerging from fMRI data. Here, we sought to investigate the effect of dopaminergic perturbations on adaptive prediction error coding in humans, using a between-subject, placebo-controlled pharmacological fMRI study with a dopaminergic agonist (bromocriptine) and antagonist (sulpiride)...
February 15, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
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