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https://www.readbyqxmd.com/read/28803592/brain-alterations-potentially-associated-with-aggression-and-terrorism
#1
Bernhard Bogerts, Maria Schöne, Stephanie Breitschuh
A large proportion of the persons who join terrorist groups as well as lone-acting terrorists have a history of violent behavior or mental disorder that predated their becoming terrorists. This suggests that brain alterations found to occur in violent perpetrators may also be present in a significant percentage of terrorists. After a short delineation of phylogenetically old neuronal networks that are important for the generation of aggressive behavior in inconspicuous brains, this review summarizes structural and functional brain-imaging studies in violent offenders published over the last 10 years...
August 14, 2017: CNS Spectrums
https://www.readbyqxmd.com/read/28797600/the-rat-retrosplenial-cortex-as-a-link-for-frontal-functions-a-lesion-analysis
#2
Anna L Powell, Andrew J D Nelson, Emma Hindley, Moira Davies, John P Aggleton, Seralynne D Vann
Cohorts of rats with excitotoxic retrosplenial cortex lesions were tested on four behavioural tasks sensitive to dysfunctions in prelimbic cortex, anterior cingulate cortex, or both. In this way the study tested whether retrosplenial cortex has nonspatial functions that reflect its anatomical interactions with these frontal cortical areas. In Experiment 1, retrosplenial cortex lesions had no apparent effect on a set-shifting digging task that taxed intradimensional and extradimensional attention, as well as reversal learning...
August 8, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28790900/maladaptive-decision-making-in-adults-with-a-history-of-adolescent-alcohol-use-in-a-preclinical-model-is-attributable-to-the-compromised-assignment-of-incentive-value-during-stimulus-reward-learning
#3
Lauren C Kruse, Abigail G Schindler, Rapheal G Williams, Sophia J Weber, Jeremy J Clark
According to recent WHO reports, alcohol remains the number one substance used and abused by adolescents, despite public health efforts to curb its use. Adolescence is a critical period of biological maturation where brain development, particularly the mesocorticolimbic dopamine system, undergoes substantial remodeling. These circuits are implicated in complex decision making, incentive learning and reinforcement during substance use and abuse. An appealing theoretical approach has been to suggest that alcohol alters the normal development of these processes to promote deficits in reinforcement learning and decision making, which together make individuals vulnerable to developing substance use disorders in adulthood...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28756212/an-analysis-of-dentate-gyrus-function-an-update
#4
REVIEW
Raymond P Kesner
In this review there will be a description of the dentate gyrus (DG) neural circuitry that mediates the operation of a variety of mnemonic processes associated with dorsal and ventral DG function in rats. Dysfunction of the dorsal DG can be shown to mediate mnemonic processing of spatially based information including a) the operation of conjunctive encoding of multiple sensory inputs to determine spatial representations, b) pattern separation based on reducing interference between similar spatial locations and spatial contexts for horizontal distance between objects, vertical distance for height of objects, slope or angle of motor movements, c) importance of spatial context in object recognition and processing of shades of grey associated with the walls of the box d) temporal integration in the creation of remote memory based in part on DG neurogenesis and function of the CA3 subregion of the hippocampus...
July 26, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28740816/probability-and-magnitude-evaluation-in-schizophrenia
#5
REVIEW
Matthew A Albrecht, James A Waltz, Michael J Frank, James M Gold
Alterations in reinforcement learning and decision making in schizophrenia have been linked with orbitofrontal cortex (OFC) dysfunction, a region critical for weighing reward magnitude in the calculation of expected value (EV). However, much of this work has used complex tasks that require combined learning and EV calculation. Here we used a simple "Roulette" task that examined the calculation of EV directly through a combination of text and/or pictorial representation of reward probability and magnitude. Forty-four people with schizophrenia and 30 controls were recruited...
September 2016: Schizophrenia Research. Cognition
https://www.readbyqxmd.com/read/28737419/behavioral-activation-as-a-common-mechanism-of-change-across-different-orientations-and-disorders
#6
Giancarlo Dimaggio, Golan Shahar
Behavioral activation is an effective treatment for depression, based on targeting deprivation of positive rewards. It becomes more and more evident that many forms of mental disorders and psychological suffering involve reduction of goal-driven and pleasant activities. This reduction leaves negative mental states free to take the center of consciousness, without being counterbalanced by positive feelings, memories, and experiences of agency, self-efficacy, competence, relaxation, energy, and satisfaction. Reduced activity can be found in disorders ranging from chronic pain to personality disorders and schizophrenia...
July 24, 2017: Psychotherapy
https://www.readbyqxmd.com/read/28735969/temporal-dynamics-of-reward-anticipation-in-the-human-brain
#7
Yuanyuan Zhang, Qi Li, Zhao Wang, Xun Liu, Ya Zheng
Reward anticipation is a complex process including cue evaluation, motor preparation, and feedback anticipation. The present study investigated whether these psychological processes were dissociable on neural dynamics in terms of incentive valence and approach motivation. We recorded EEG when participants were performing a monetary incentive delay task, and found a cue-P3 during the cue-evaluation stage, a contingent negative variation (CNV) during the motor-preparation stage, and a stimulus-preceding negativity (SPN) during the feedback-anticipation stage...
July 21, 2017: Biological Psychology
https://www.readbyqxmd.com/read/28729439/striatal-gpr88-modulates-foraging-efficiency
#8
Aundrea Rainwater, Elisenda Sanz, Richard D Palmiter, Albert Quintana
The striatum is anatomically and behaviorally implicated in behaviors that promote efficient foraging. To investigate this function, we studied instrumental choice behavior in mice lacking GPR88, a striatum-enriched orphan G-protein-coupled receptor that modulates striatal medium spiny neuron (MSN) excitability. Our results reveal that hungry mice lacking GPR88 (KO mice) were slow to acquire food-reinforced lever-press, but could lever press similar to controls on a progressive-ratio schedule. Both WT and KO mice discriminated between reward and no-reward levers; however, KO mice failed to discriminate based on relative quantity- reward (1 versus 3 food pellets) or effort (3 versus 9 lever presses)...
July 20, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28723943/stress-enhances-model-free-reinforcement-learning-only-after-negative-outcome
#9
Heyeon Park, Daeyeol Lee, Jeanyung Chey
Previous studies found that stress shifts behavioral control by promoting habits while decreasing goal-directed behaviors during reward-based decision-making. It is, however, unclear how stress disrupts the relative contribution of the two systems controlling reward-seeking behavior, i.e. model-free (or habit) and model-based (or goal-directed). Here, we investigated whether stress biases the contribution of model-free and model-based reinforcement learning processes differently depending on the valence of outcome, and whether stress alters the learning rate, i...
2017: PloS One
https://www.readbyqxmd.com/read/28720903/pharmacological-modulation-of-5-ht2c-receptor-activity-produces-bidirectional-changes-in-locomotor-activity-responding-for-a-conditioned-reinforcer-and-mesolimbic-da-release-in-c57bl-6-mice
#10
Caleb J Browne, Xiaodong Ji, Guy A Higgins, Paul J Fletcher, Colin Harvey-Lewis
Converging lines of behavioral, electrophysiological, and biochemical evidence suggest that 5-HT2C receptor signaling may bidirectionally influence reward-related behavior through an interaction with the mesolimbic dopamine (DA) system. Here we directly test this hypothesis by examining how modulating 5-HT2C receptor activity affects DA-dependent behaviors and relate these effects to changes in nucleus accumbens (NAc) DA release. In C57BL/6 mice, locomotor activity and responding for a conditioned reinforcer (CRf), a measure of incentive motivation, were examined following treatment with three 5-HT2C receptor ligands: the agonist CP809101 (0...
June 13, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28716608/opioidergic-and-dopaminergic-modulation-of-cost-benefit-decision-making-in-long-evans-rats
#11
Ileana Morales, Paul J Currie, Timothy D Hackenberg, Raúl Pastor
Eating disorders are associated with impaired decision-making and dysfunctional reward-related neurochemistry. The present study examined the potential contributions of dopamine and opioid signaling to these processes using two different decision-making tasks. In one task, Long Evans Rats chose between working for a preferred food (high-carbohydrate banana-flavored sucrose pellets) by lever pressing on a progressive-ratio schedule of reinforcement vs. obtaining less preferred laboratory chow that was concurrently available...
July 14, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28710498/gene-network-dysregulation-in-dorsolateral-prefrontal-cortex-neurons-of-humans-with-cocaine-use-disorder
#12
Efrain A Ribeiro, Joseph R Scarpa, Susanna P Garamszegi, Andrew Kasarskis, Deborah C Mash, Eric J Nestler
Metabolic and functional alterations of neurons in the dorsolateral prefrontal cortex (dlPFC) are thought to contribute to impulsivity, which is a hallmark of addictive behaviors that underlie compulsive drug seeking and taking in humans. To determine if there is a transcriptional signature in dlPFC neurons of humans with cocaine use disorder, we performed total RNA-sequencing on neuronal nuclei isolated from post-mortem dlPFC of cocaine addicts and healthy controls. Our results point toward a transcriptional mechanism whereby cocaine alters specific gene networks in dlPFC neurons...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28708901/sex-specific-enhancement-of-palatability-driven-feeding-in-adolescent-rats
#13
Andrew T Marshall, Angela T Liu, Niall P Murphy, Nigel T Maidment, Sean B Ostlund
It has been hypothesized that brain development during adolescence perturbs reward processing in a way that may ultimately contribute to the risky decision making associated with this stage of life, particularly in young males. To investigate potential reward dysfunction during adolescence, Experiment 1 examined palatable fluid intake in rats as a function of age and sex. During a series of twice-weekly test sessions, non-food-deprived rats were given the opportunity to voluntarily consume a highly palatable sweetened condensed milk (SCM) solution...
2017: PloS One
https://www.readbyqxmd.com/read/28704978/evidences-from-rewarding-system-frn-and-p300-effect-in-internet-addiction-in-young-people-short-title-rewarding-system-and-eeg-in-internet-addiction
#14
Michela Balconi, Irene Venturella, Roberta Finocchiaro
The present research explored rewarding bias and attentional deficits in Internet addiction (IA) based on the IAT (Internet Addiction Test) construct, during an attentional inhibitory task (Go/NoGo task). Event-related Potentials (ERPs) effects (Feedback Related Negativity (FRN) and P300) were monitored in concomitance with Behavioral Activation System (BAS) modulation. High-IAT young participants showed specific responses to IA-related cues (videos representing online gambling and videogames) in terms of cognitive performance (decreased Response Times, RTs; and Error Rates, ERs) and ERPs modulation (decreased FRN and increased P300)...
July 12, 2017: Brain Sciences
https://www.readbyqxmd.com/read/28701918/striatal-transcriptome-and-interactome-analysis-of-shank3-overexpressing-mice-reveals-the-connectivity-between-shank3-and-mtorc1-signaling
#15
Yeunkum Lee, Sun Gyun Kim, Bokyoung Lee, Yinhua Zhang, Yoonhee Kim, Shinhyun Kim, Eunjoon Kim, Hyojin Kang, Kihoon Han
Mania causes symptoms of hyperactivity, impulsivity, elevated mood, reduced anxiety and decreased need for sleep, which suggests that the dysfunction of the striatum, a critical component of the brain motor and reward system, can be causally associated with mania. However, detailed molecular pathophysiology underlying the striatal dysfunction in mania remains largely unknown. In this study, we aimed to identify the molecular pathways showing alterations in the striatum of SH3 and multiple ankyrin repeat domains 3 (Shank3)-overexpressing transgenic (TG) mice that display manic-like behaviors...
2017: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/28701749/calcium-activated-sk-channels-control-firing-regularity-by-modulating-sodium-channel-availability-in-midbrain-dopamine-neurons
#16
Rajeshwari Iyer, Mark A Ungless, Aldo A Faisal
Dopamine neurons in the substantia nigra pars compacta and ventral tegmental area regulate behaviours such as reward-related learning, and motor control. Dysfunction of these neurons is implicated in Schizophrenia, addiction to drugs, and Parkinson's disease. While some dopamine neurons fire single spikes at regular intervals, others fire irregular single spikes interspersed with bursts. Pharmacological inhibition of calcium-activated potassium (SK) channels increases the variability in their firing pattern, sometimes also increasing the number of spikes fired in bursts, indicating that SK channels play an important role in maintaining dopamine neuron firing regularity and burst firing...
July 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28701540/a-novel-paraplegia-model-in-awake-behaving-macaques
#17
Max Ostrinsky Krucoff, Katie Zhuang, David B Macleod, Allen Yin, Yoon Woo Byun, Roberto Jose Manson, Dennis A Turner, Laura Oliveira, Mikhail A Lebedev
Lower limb paralysis from spinal cord injury (SCI) or neurological disease carries a poor prognosis for recovery and remains a large societal burden. Neurophysiological and neuroprosthetic research have the potential to improve quality of life for these patients; however, the lack of an ethical and sustainable non-human primate model for paraplegia hinders their advancement. Therefore, our multi-disciplinary team developed a way to induce temporary paralysis in awake behaving macaques by creating a fully implantable lumbar epidural catheter-subcutaneous port system that enables easy and reliable targeted drug delivery for sensorimotor blockade...
July 12, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28696429/glud1-linked-to-schizophrenia-controls-the-burst-firing-of-dopamine-neurons
#18
N Benamer, F Marti, R Lujan, R Hepp, T G Aubier, A A M Dupin, G Frébourg, S Pons, U Maskos, P Faure, Y A Hay, B Lambolez, L Tricoire
Human mutations of the GRID1 gene encoding the orphan delta1 glutamate receptor-channel (GluD1) are associated with schizophrenia but the explicit role of GluD1 in brain circuits is unknown. Based on the known function of its paralog GluD2 in cerebellum, we searched for a role of GluD1 in slow glutamatergic transmission mediated by metabotropic receptor mGlu1 in midbrain dopamine neurons, whose dysfunction is a hallmark of schizophrenia. We found that an mGlu1 agonist elicits a slow depolarizing current in HEK cells co-expressing mGlu1 and GluD1, but not in cells expressing mGlu1 or GluD1 alone...
July 11, 2017: Molecular Psychiatry
https://www.readbyqxmd.com/read/28686107/critical-exploration-of-co-occurring-attention-deficit-hyperactivity-disorder-mood-disorder-and-substance-use-disorder
#19
REVIEW
Judith Regnart, Ilse Truter, Anneke Meyer
Co-occurring disorders (CODs) describe a Substance Use Disorder (SUD) accompanied by a comorbid psychiatric disorder. Attention-Deficit/Hyperactivity Disorder (ADHD) and mood disorders are common CODs with high prevalence rates in SUD populations. It is proposed that literature on a tri-condition presentation of ADHD, mood disorder and SUD is limited. Areas covered: A literature search was conducted using a keyword search on EBSCOhost. Initially 2 799 records were identified, however, only two articles included all three conditions occurring concurrently in individuals...
June 2017: Expert Review of Pharmacoeconomics & Outcomes Research
https://www.readbyqxmd.com/read/28683266/disrupted-prefrontal-regulation-of-striatal-subjective-value-signals-in-psychopathy
#20
Jay G Hosking, Erik K Kastman, Hayley M Dorfman, Gregory R Samanez-Larkin, Arielle Baskin-Sommers, Kent A Kiehl, Joseph P Newman, Joshua W Buckholtz
Psychopathy is a personality disorder with strong links to criminal behavior. While research on psychopathy has focused largely on socio-affective dysfunction, recent data suggest that aberrant decision making may also play an important role. Yet, the circuit-level mechanisms underlying maladaptive decision making in psychopathy remain unclear. Here, we used a multi-modality functional imaging approach to identify these mechanisms in a population of adult male incarcerated offenders. Psychopathy was associated with stronger subjective value-related activity within the nucleus accumbens (NAcc) during inter-temporal choice and with weaker intrinsic functional connectivity between NAcc and ventromedial prefrontal cortex (vmPFC)...
July 5, 2017: Neuron
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