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https://www.readbyqxmd.com/read/28642724/i-don-t-want-to-miss-a-thing-learning-dynamics-and-effects-of-feedback-type-and-monetary-incentive-in-a-paired-associate-deterministic-learning-task
#1
Magda Gawlowska, Ewa Beldzik, Aleksandra Domagalik, Adam Gagol, Tadeusz Marek, Justyna Mojsa-Kaja
Effective functioning in a complex environment requires adjusting of behavior according to changing situational demands. To do so, organisms must learn new, more adaptive behaviors by extracting the necessary information from externally provided feedback. Not surprisingly, feedback-guided learning has been extensively studied using multiple research paradigms. The purpose of the present study was to test the newly designed Paired Associate Deterministic Learning task (PADL), in which participants were presented with either positive or negative deterministic feedback...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28642068/chloramphenicol-decreases-cb1-receptor-expression-in-the-nucleus-accumbens-and-prefrontal-cortex-and-prevents-amphetamine-induced-conditioned-place-preference-in-rats
#2
Octavio Amancio-Belmont, Diego Pérez-Vázquez, Alejandra E Ruiz-Contreras, Miguel Pérez de la Mora, Pavel E Rueda-Orozco, Mónica Méndez-Díaz, Oscar E Prospero-Garcia
Drug dependence seems to involve a learning and memory process. Since learning and memory depend on protein synthesis, drug dependence may depend on protein synthesis, too. Drug-induced reward is a crucial effect for the development of drug-dependence. We used chloramphenicol (CAP, a protein synthesis inhibitor), to evaluate its effects on amphetamine (amph)-seeking behavior, on CB1R expression and on protein synthesis in general, in specific areas of the brain. Two groups of Wistar adult male rats were subjected to amph-induced conditioned place preference (CPP)...
June 19, 2017: Pharmacology, Biochemistry, and Behavior
https://www.readbyqxmd.com/read/28640825/olfactory-learning-without-the-mushroom-bodies-spiking-neural-network-models-of-the-honeybee-lateral-antennal-lobe-tract-reveal-its-capacities-in-odour-memory-tasks-of-varied-complexities
#3
HaDi MaBouDi, Hideaki Shimazaki, Martin Giurfa, Lars Chittka
The honeybee olfactory system is a well-established model for understanding functional mechanisms of learning and memory. Olfactory stimuli are first processed in the antennal lobe, and then transferred to the mushroom body and lateral horn through dual pathways termed medial and lateral antennal lobe tracts (m-ALT and l-ALT). Recent studies reported that honeybees can perform elemental learning by associating an odour with a reward signal even after lesions in m-ALT or blocking the mushroom bodies. To test the hypothesis that the lateral pathway (l-ALT) is sufficient for elemental learning, we modelled local computation within glomeruli in antennal lobes with axons of projection neurons connecting to a decision neuron (LHN) in the lateral horn...
June 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/28640450/network-supervision-of-adult-experience-and-learning-dependent-sensory-cortical-plasticity
#4
David T Blake
The brain is capable of remodeling throughout life. The sensory cortices provide a useful preparation for studying neuroplasticity both during development and thereafter. In adulthood, sensory cortices change in the cortical area activated by behaviorally relevant stimuli, by the strength of response within that activated area, and by the temporal profiles of those responses. Evidence supports forms of unsupervised, reinforcement, and fully supervised network learning rules. Studies on experience-dependent plasticity have mostly not controlled for learning, and they find support for unsupervised learning mechanisms...
June 18, 2017: Comprehensive Physiology
https://www.readbyqxmd.com/read/28638322/neural-signals-related-to-outcome-evaluation-are-stronger-in-ca1-than-ca3
#5
Sung-Hyun Lee, Namjung Huh, Jong Won Lee, Jeong-Wook Ghim, Inah Lee, Min W Jung
We have shown previously that CA1 conveys significant neural signals necessary to update value of the chosen target, namely chosen value and reward signals. To better understand hippocampal neural processes related to valuation, we compared chosen value- and reward-related neural activity between the CA3 and CA1 regions. Single units were recorded with tetrodes from the dorsal CA3 and CA1 regions of rats performing a dynamic foraging task, and chosen value- and reward-related neural activity was estimated using a reinforcement learning model and multiple regression analyses...
2017: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/28637713/a-pilot-study-of-interprofessional-palliative-care-education-of-medical-students-in-the-uk-and-usa
#6
Amy Gadoud, Wei-Hsin Lu, Lisa Strano-Paul, Susan Lane, Jason W Boland
BACKGROUND: Educating medical students to care for patients at the end-of-life is increasingly recognised as an essential component of training. Traditionally, medical student programmes are run by doctors, but patient care is delivered by an interprofessional team. Our programmes in the UK and USA independently developed a teaching experience led by an interprofessional team of palliative care health professionals. OBJECTIVES: This study explores the palliative care health professionals' perceptions, regarding their unique role in medical student palliative care education...
June 21, 2017: BMJ Supportive & Palliative Care
https://www.readbyqxmd.com/read/28632018/exploring-the-learnability-and-usability-of-a-near-field-communication-based-application-for-semantic-enrichment-in-children-with-language-disorders
#7
Maria Luisa Lorusso, Emilia Biffi, Massimo Molteni, Gianluigi Reni
Recently, a few software applications (apps) have been developed to enhance vocabulary and conceptual networks to address the needs of children with language impairments (LI), but there is no evidence about their impact and their usability in therapy contexts. Here, we try to fill this gap presenting a system aimed at improving the semantic competence and the structural knowledge of children with LI. The goal of the study is to evaluate learnability, usability, user satisfaction and quality of the interaction between the system and the children...
February 13, 2017: Assistive Technology: the Official Journal of RESNA
https://www.readbyqxmd.com/read/28631520/striatal-changes-underlie-mpep-mediated-suppression-of-the-acquisition-and-expression-of-pramipexole-induced-place-preference-in-an-alpha-synuclein-rat-model-of-parkinson-s-disease
#8
Simon Loiodice, Portia McGhan, Vitalina Gryshkova, Renaud Fleurance, David Dardou, Aziz Hafidi, Andre Nogueira da Costa, Franck Durif
Impulsive-compulsive disorders in Parkinson's disease patients have been described as behavioural or substance addictions including pathological gambling or compulsive medication use of dopamine replacement therapy. A substantial gap remains in the understanding of these disorders. We previously demonstrated that the rewarding effect of the D2/D3 agonist pramipexole was enhanced after repeated exposure to L-dopa and alpha-synuclein mediated dopaminergic nigral loss with specific transcriptional signatures suggesting a key involvement of the glutamatergic pathway...
June 1, 2017: Journal of Psychopharmacology
https://www.readbyqxmd.com/read/28630257/contrasting-effects-of-medial-and-lateral-orbitofrontal-cortex-lesions-on-credit-assignment-and-decision-making-in-humans
#9
MaryAnn P Noonan, Bolton Chau, Matthew Fs Rushworth, Lesley K Fellows
The orbitofrontal cortex is critical for goal-directed behavior. Recent work in macaques has suggested the lateral orbitofrontal cortex (lOFC) is relatively more concerned with assignment of credit for rewards to particular choices during value-guided learning, while the medial orbitofrontal cortex (often referred to as ventromedial prefrontal cortex in humans; vmPFC/mOFC) is involved in constraining the decision to the relevant options. We examined whether people with damage restricted to sub-regions of prefrontal cortex showed the patterns of impairment observed in prior investigations of the effects of lesions to homologous regions in macaques...
June 19, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28630254/reward-selectively-modulates-the-lingering-neural-representation-of-recently-attended-objects-in-natural-scenes
#10
Clayton Hickey, Marius Peelen
Theories of reinforcement learning and approach behaviour suggest that reward can increase the perceptual salience of environmental stimuli, ensuring that potential predictors of outcome are noticed in the future. But outcome commonly follows visual processing of the environment, occurring even when potential reward cues have long disappeared. How can reward feedback retroactively cause now-absent stimuli to become attention-drawing in the future? One possibility is that reward and attention interact to prime lingering visual representations of attended stimuli that sustain through the interval separating stimulus and outcome...
June 19, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28629382/community-first-responders-and-responder-schemes-in-the-united-kingdom-systematic-scoping-review
#11
Viet-Hai Phung, Ian Trueman, Fiona Togher, Roderick Orner, A Niroshan Siriwardena
BACKGROUND: Community First Responder (CFR) schemes support lay people to respond to medical emergencies, working closely with ambulance services. They operate widely in the UK. There has been no previous review of UK literature on these schemes. This is the first systematic scoping review of UK literature on CFR schemes, which identifies the reasons for becoming a CFR, requirements for training and feedback and confusion between the CFR role and that of ambulance service staff. This study also reveals gaps in the evidence base for CFR schemes...
June 19, 2017: Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine
https://www.readbyqxmd.com/read/28628005/emergence-of-visually-evoked-reward-expectation-signals-in-dopamine-neurons-via-the-superior-colliculus-in-v1-lesioned-monkeys
#12
Norihiro Takakuwa, Rikako Kato, Peter Redgrave, Tadashi Isa
Responses of midbrain dopamine (DA) neurons reflecting expected reward from sensory cues are critical for reward-based associative learning. However, critical pathways by which reward-related visual information is relayed to DA neurons remain unclear. To address this question, we investigated Pavlovian conditioning in macaque monkeys with unilateral primary visual cortex (V1) lesions (an animal model of 'blindsight'). Anticipatory licking responses to obtain juice drops were elicited in response to visual conditioned stimuli (CS) in the affected visual field...
June 19, 2017: ELife
https://www.readbyqxmd.com/read/28627906/evidence-of-a-goal-directed-process-in-human-pavlovian-instrumental-transfer
#13
Tina Seabrooke, Mike E Le Pelley, Lee Hogarth, Chris J Mitchell
Cues that signal rewards can motivate reward-seeking behaviors, even for outcomes that are not currently desired. Three experiments examined this phenomenon, using an outcome-selective Pavlovian-instrumental transfer (PIT) design and an outcome devaluation procedure. In Experiment 1, participants learned to perform one response to earn crisps points and another response to earn popcorn points. One outcome was then devalued by adulterating it to make it taste unpleasant. On test, overall response choice was biased toward the outcome that had not been devalued, indicating goal-directed control...
June 19, 2017: Journal of Experimental Psychology. Animal Learning and Cognition
https://www.readbyqxmd.com/read/28626011/effects-of-ventral-striatum-lesions-on-stimulus-versus-action-based-reinforcement-learning
#14
Kathryn M Rothenhoefer, Vincent D Costa, Ramón Bartolo, Raquel Vicario-Feliciano, Elisabeth A Murray, Bruno B Averbeck
Learning the values of actions versus stimuli may depend on separable neural circuits. In the current study, we evaluated ventral striatum (VS) lesioned macaques' performance on a two-arm bandit task that had randomly interleaved blocks of stimulus based and action based reinforcement learning (RL). Compared to controls, monkeys with VS lesions had deficits in learning to select rewarding images but not rewarding actions. We used a RL model to quantify learning and choice consistency and found that, in stimulus based RL, the VS lesion monkeys were more influenced by negative feedback and had lower choice consistency than controls...
June 16, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28625106/deceptive-pollination-and-insects-learning-a-delicate-balance
#15
Virgilio Vázquez, Ignacio Barradas
In this paper we propose and discuss a simple two-dimensional model describing the interaction between two species: a plant population that gets pollinated by an insect population. The plants attract the insects deceiving them and not delivering any reward. We are interested in analysing the effect of learning by the insect population due to unsuccessfully visiting the deceiving plants. We are especially interested in three elements: conditions for the simultaneous coexistence of both species, their extinction as a function of the biological cost of the deceptiveness for the pollinator, and the appearance of oscillations in the dynamics...
December 2017: Journal of Biological Dynamics
https://www.readbyqxmd.com/read/28624517/intra-accumbal-blockade-of-endocannabinoid-cb1-receptors-impairs-learning-but-not-retention-of-conditioned-relief
#16
Jorge R Bergado Acosta, Miriam Schneider, Markus Fendt
Humans and animals are able to associate an environmental cue with the feeling of relief from an aversive event, a phenomenon called relief learning. Relief from an aversive event is rewarding and a relief-associated cue later induces an attenuation of the startle magnitude or approach behavior. Previous studies demonstrated that the nucleus accumbens is essential for relief learning. Here, we asked whether accumbal cannabinoid type 1 (CB1) receptors are involved in relief learning. In rats, we injected the CB1 receptor antagonist/inverse agonist SR141716A (rimonabant) directly into the nucleus accumbens at different time points during a relief learning experiment...
June 15, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28620314/orexin-system-the-key-for-a-healthy-life
#17
REVIEW
Sergio Chieffi, Marco Carotenuto, Vincenzo Monda, Anna Valenzano, Ines Villano, Francesco Precenzano, Domenico Tafuri, Monica Salerno, Nicola Filippi, Francesco Nuccio, Maria Ruberto, Vincenzo De Luca, Luigi Cipolloni, Giuseppe Cibelli, Maria P Mollica, Diego Iacono, Ersilia Nigro, Marcellino Monda, Giovanni Messina, Antonietta Messina
The orexin-A/hypocretin-1 and orexin-B/hypocretin-2 are neuropeptides synthesized by a cluster of neurons in the lateral hypothalamus and perifornical area. Orexin neurons receive a variety of signals related to environmental, physiological and emotional stimuli, and project broadly to the entire CNS. Orexin neurons are "multi-tasking" neurons regulating a set of vital body functions, including sleep/wake states, feeding behavior, energy homeostasis, reward systems, cognition and mood. Furthermore, a dysfunction of orexinergic system may underlie different pathological conditions...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28619654/representational-precision-in-visual-cortex-reveals-outcome-encoding-and-reward-modulation-during-action-preparation
#18
Henk van Steenbergen, Christopher M Warren, Simone Kühn, Sanne de Wit, Reinout W Wiers, Bernhard Hommel
According to ideomotor theory, goal-directed action involves the active perceptual anticipation of actions and their associated effects. We used multivariate analysis of fMRI data to test if preparation of an action promotes precision in the perceptual representation of the action. In addition, we tested how reward magnitude modulates this effect. Finally, we examined how expectation and uncertainty impact neural precision in the motor cortex. In line with our predictions, preparation of a hand or face action increased the precision of neural activation patterns in the extrastriate body area (EBA) and fusiform face area (FFA), respectively...
June 12, 2017: NeuroImage
https://www.readbyqxmd.com/read/28611691/morphine-reward-promotes-cue-sensitive-learning-implication-of-dorsal-striatal-creb-activity
#19
Mathieu Baudonnat, Jean-Louis Guillou, Marianne Husson, Veronique D Bohbot, Lars Schwabe, Vincent David
Different parallel neural circuits interact and may even compete to process and store information: whereas stimulus-response (S-R) learning critically depends on the dorsal striatum (DS), spatial memory relies on the hippocampus (HPC). Strikingly, despite its potential importance for our understanding of addictive behaviors, the impact of drug rewards on memory systems dynamics has not been extensively studied. Here, we assessed long-term effects of drug- vs food reinforcement on the subsequent use of S-R vs spatial learning strategies and their neural substrates...
2017: Frontiers in Psychiatry
https://www.readbyqxmd.com/read/28609483/histone-posttranslational-modifications-predict-specific-alternative-exon-subtypes-in-mammalian-brain
#20
Qiwen Hu, Eun Ji Kim, Jian Feng, Gregory R Grant, Elizabeth A Heller
A compelling body of literature, based on next generation chromatin immunoprecipitation and RNA sequencing of reward brain regions indicates that the regulation of the epigenetic landscape likely underlies chronic drug abuse and addition. It is now critical to develop highly innovative computational strategies to reveal the relevant regulatory transcriptional mechanisms that may underlie neuropsychiatric disease. We have analyzed chromatin regulation of alternative splicing, which is implicated in cocaine exposure in mice...
June 13, 2017: PLoS Computational Biology
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