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https://www.readbyqxmd.com/read/28549647/pavlovian-influences-on-learning-differ-between-rats-and-mice-in-a-counter-balanced-go-nogo-judgement-bias-task
#1
Samantha Jones, Elizabeth S Paul, Peter Dayan, Emma S J Robinson, Michael Mendl
Judgement bias tests of animal affect and hence welfare assume that the animal's responses to ambiguous stimuli, which may herald positive or negative outcomes, are under instrumental control and reflect 'optimism' or 'pessimism' about what will happen. However, Pavlovian control favours responses (e.g. approach or withdrawal) according to the valence associated with a stimulus, rather than the anticipated response outcomes. Typically, positive contexts promote action and approach whilst negative contexts promote inhibition or withdrawal...
May 23, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28541285/endogenous-opioids-regulate-social-threat-learning-in-humans
#2
Jan Haaker, Jonathan Yi, Predrag Petrovic, Andreas Olsson
Many fearful expectations are shaped by observation of aversive outcomes to others. Yet, the neurochemistry regulating social learning is unknown. Previous research has shown that during direct (Pavlovian) threat learning, information about personally experienced outcomes is regulated by the release of endogenous opioids, and activity within the amygdala and periaqueductal gray (PAG). Here we report that blockade of this opioidergic circuit enhances social threat learning through observation in humans involving activity within the amygdala, midline thalamus and the PAG...
May 25, 2017: Nature Communications
https://www.readbyqxmd.com/read/28523223/transcranial-direct-current-stimulation-may-modulate-extinction-memory-in-posttraumatic-stress-disorder
#3
Mascha Van't Wout, Sharon M Longo, Madhavi K Reddy, Noah S Philip, Marguerite T Bowker, Benjamin D Greenberg
BACKGROUND: Abnormalities in fear extinction and recall are core components of posttraumatic stress disorder (PTSD). Data from animal and human studies point to a role of the ventromedial prefrontal cortex (vmPFC) in extinction learning and subsequent retention of extinction memories. Given the increasing interest in developing noninvasive brain stimulation protocols for psychopathology treatment, we piloted whether transcranial direct current stimulation (tDCS) during extinction learning, vs...
May 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28512009/combining-d-cycloserine-with-appetitive-extinction-learning-modulates-amygdala-activity-during-recall
#4
Claudia Ebrahimi, Stefan P Koch, Eva Friedel, Ilsoray Crespo, Thomas Fydrich, Andreas Ströhle, Andreas Heinz, Florian Schlagenhauf
Appetitive Pavlovian conditioning plays a crucial role in the pathogenesis of drug addiction and conditioned reward cues can trigger craving and relapse even after long phases of abstinence. Promising preclinical work showed that the NMDA-receptor partial agonist D-cycloserine (DCS) facilitates Pavlovian extinction learning of fear and drug cues. Furthermore, DCS-augmented exposure therapy seems to be beneficial in various anxiety disorders, while the supposed working mechanism of DCS during human appetitive or aversive extinction learning is still not confirmed...
May 13, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28511979/water-and-t-maze-protocols-are-equally-efficient-methods-to-assess-spatial-memory-in-3xtg-alzheimer-s-disease-mice
#5
K E Davis, K Burnett, J Gigg
Rodent spatial memory is commonly tested using the water-maze; however, there is a potential confound of stress on learning in this behavioural paradigm. This is particularly relevant when testing spatial memory in models of neurodegeneration, such as the 3xTg mouse model for Alzheimer's disease. Here, we first confirmed that 3xTgAD mice express fear conditioning and then compared the performance of young and middle-aged mice on short-duration versions of the radial arm water-maze (RAWM) and the minimally stressful T-maze spontaneous alternation task...
May 13, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28504638/catecholaminergic-challenge-uncovers-distinct-pavlovian-and-instrumental-mechanisms-of-motivated-in-action
#6
Jennifer C Swart, Monja I Froböse, Jennifer L Cook, Dirk Em Geurts, Michael J Frank, Roshan Cools, Hanneke Em den Ouden
Catecholamines modulate the impact of motivational cues on action. Such motivational biases have been proposed to reflect cue-based, 'Pavlovian' effects. Here, we assess whether motivational biases may also arise from asymmetrical instrumental learning of active and passive responses following reward and punishment outcomes. We present a novel paradigm, allowing us to disentangle the impact of reward and punishment on instrumental learning from Pavlovian response biasing. Computational analyses showed that motivational biases reflect both Pavlovian and instrumental effects: reward and punishment cues promoted generalized (in)action in a Pavlovian manner, whereas outcomes enhanced instrumental (un)learning of chosen actions...
May 15, 2017: ELife
https://www.readbyqxmd.com/read/28499495/distraction-suppression-and-distress-endurance-diminish-the-extent-to-which-generalized-conditioned-fear-is-associated-with-maladaptive-behavioral-avoidance
#7
Christopher Hunt, Samuel E Cooper, Melissa P Hartnell, Shmuel Lissek
A central conditioning correlate of clinical anxiety is the over-generalization of Pavlovian fear to safe stimuli resembling conditioned danger cues (CS+). Though much of the pathogenic influence of such generalization may lie in the unnecessary behavioral avoidance it evokes, few studies have examined maladaptive avoidance associated with Pavlovian generalization. Lab-based assessments of this process, here referred to as instrumental avoidance from Pavlovian generalization (IAP-G), have recently begun. The current study represents a next step in this line of work by examining personality factors that may reduce maladaptive IAP-G...
April 27, 2017: Behaviour Research and Therapy
https://www.readbyqxmd.com/read/28496171/altered-balance-of-excitatory-and-inhibitory-learning-in-a-genetically-modified-mouse-model-of-glutamatergic-dysfunction-relevant-to-schizophrenia
#8
David J Sanderson, Aletheia Lee, Rolf Sprengel, Peter H Seeburg, Paul J Harrison, David M Bannerman
The GluA1 AMPAR subunit (encoded by the Gria1 gene) has been implicated in schizophrenia. Gria1 knockout in mice results in recently experienced stimuli acquiring aberrantly high salience. This suggests that GluA1 may be important for learning that is sensitive to the temporal contiguity between events. To test this, mice were trained on a Pavlovian trace conditioning procedure in which the presentation of an auditory cue and food were separated by a temporal interval. Wild-type mice initially learnt, but with prolonged training came to withhold responding during the trace-conditioned cue, responding less than for another cue that was nonreinforced...
May 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28488160/modulation-of-aversive-memory-by-adult-hippocampal-neurogenesis
#9
REVIEW
Michael R Drew, Kylie A Huckleberry
Adult hippocampal neurogenesis (AHN) occurs in humans and every other mammalian species examined. Evidence that AHN is stimulated by a variety of treatments and behaviors with anxiolytic properties has sparked interest in harnessing AHN to treat anxiety disorders. However, relatively little is known about the mechanisms through which AHN modulates fear and anxiety. In this review, we consider evidence that AHN modulates fear and anxiety by altering the processing of and memory for traumatic experiences. Based on studies of the role of AHN in Pavlovian fear conditioning, we conclude that AHN modulates the consequences of aversive experience by influencing 1) the efficiency of hippocampus-dependent memory acquisition; 2) generalization of hippocampal fear memories; 3) long-term retention of hippocampal aversive memories; and 4) the nonassociative effects of acute aversive experience...
May 9, 2017: Neurotherapeutics: the Journal of the American Society for Experimental NeuroTherapeutics
https://www.readbyqxmd.com/read/28487202/thalamic-mast-cell-activity-is-associated-with-sign-tracking-behavior-in-rats
#10
Christopher J Fitzpatrick, Jonathan D Morrow
Mast cells are resident immune cells in the thalamus that can degranulate and release hundreds of signaling molecules (i.e., monoamines, growth factors, and cytokines) both basally and in response to environmental stimuli. Interestingly, mast cell numbers in the brain show immense individual variation in both rodents and humans. We used a Pavlovian conditioned approach (PCA) procedure to examine whether mast cells are associated with individual variation in the attribution of incentive-motivational value to reward-related cues...
May 6, 2017: Brain, Behavior, and Immunity
https://www.readbyqxmd.com/read/28486716/pavlovian-to-instrumental-transfer-of-nicotine-and-food-cues-in-deprived-cigarette-smokers
#11
Heena R Manglani, Andrea H Lewis, Stephen J Wilson, Mauricio R Delgado
Introduction: Smoking-related cues can promote drug-seeking behavior and curtail attempts to quit. One way to understand the potential impact of such cues is to compare cue-elicited behaviors for smoking and other reinforcers (eg, food) using the Pavlovian-to-instrumental transfer paradigm, which measures how much control cues can exert over reward-seeking responses. Methods: We tested the influence of appetitive cues on smokers' behavior following 12 hours of abstinence from smoking and eating...
June 1, 2017: Nicotine & Tobacco Research: Official Journal of the Society for Research on Nicotine and Tobacco
https://www.readbyqxmd.com/read/28483586/what-can-tiny-mushrooms-in-fruit-flies-tell-us-about-learning-and-memory
#12
REVIEW
Toshihide Hige
Nervous systems have evolved to translate external stimuli into appropriate behavioral responses. In an ever-changing environment, flexible adjustment of behavioral choice by experience-dependent learning is essential for the animal's survival. Associative learning is a simple form of learning that is widely observed from worms to humans. To understand the whole process of learning, we need to know how sensory information is represented and transformed in the brain, how it is changed by experience, and how the changes are reflected on motor output...
May 5, 2017: Neuroscience Research
https://www.readbyqxmd.com/read/28483509/nitric-oxide-in-the-nucleus-of-the-tractus-solitarius-is-involved-in-hypoglycemic-conditioned-response
#13
Beatriz A Alvarado, Mónica Lemus, Sergio Montero, Valery Melnikov, Sonia Luquín, Joaquín García-Estrada, Elena Roces de Álvarez-Buylla
The repeated injection of insulin (unconditioned stimulus, UCS) immediately followed by exposure to sensory stimulation (e.g. sound or odor; conditioned stimulus, CS) results in a learned conditioned reflex in which the exposure to the CS alone lowers blood glucose. The brain regions participating in this hypoglycemic Pavlovian response remain unknown. Here we investigate if nitric oxide (NO) in the nucleus tractus solitarius (NTS), a nucleus known to be involved in glucose homeostasis, participates in this hypoglycemic reflex...
May 5, 2017: Brain Research
https://www.readbyqxmd.com/read/28473252/alcohol-seeking-and-relapse-a-focus-on-incentive-salience-and-contextual-conditioning
#14
REVIEW
Milan D Valyear, Franz R Villaruel, Nadia Chaudhri
Environmental stimuli that reliably accompany alcohol intake can become associated with the pharmacological effects of alcohol through classical (Pavlovian) conditioning. Of growing interest to addiction researchers is whether or not this process results in the attribution of incentive salience to alcohol-predictive cues, which could motivate alcohol-seeking behavior and relapse. To evaluate this question, we present a review of rodent behavioral studies that examined the capacity of alcohol-predictive cues to (i) support sign-tracking behavior, (ii) serve as conditioned reinforcers, and (iii) produce Pavlovian-to-instrumental transfer...
May 1, 2017: Behavioural Processes
https://www.readbyqxmd.com/read/28473250/extinction-of-pavlovian-conditioning-the-influence-of-trial-number-and-reinforcement-history
#15
REVIEW
C K Jonas Chan, Justin A Harris
Pavlovian conditioning is sensitive to the temporal relationship between conditioned stimulus (CS) and unconditioned stimulus (US). This has motivated models that describe learning as a process that continuously updates associative strength during the trial or specifically encodes the CS-US interval. These models predict that extinction of responding is also continuous, such that response loss is proportional to the cumulative duration of exposure to the CS without the US. We review evidence showing that this prediction is incorrect, and that extinction is trial-based rather than time-based...
May 1, 2017: Behavioural Processes
https://www.readbyqxmd.com/read/28471226/extinction-of-specific-stimulus-outcome-s-o-associations-in-pavlovian-learning-with-an-extended-cs-procedure
#16
Andrew R Delamater, Kevin Schneider, Rifka C Derman
Three experiments with male and female rats were conducted to examine the effects of Pavlovian extinction training on Pavlovian-to-instrumental transfer (PIT) in a task in which the unconditioned stimulus (US) was presented at an early time point within an extended conditioned stimulus (CS). Two instrumental responses were trained with different reinforcing outcomes (R1-O1, R2-O2) and then, independently, 2 stimuli were trained with those outcomes (S1-O1, S2-O2). One group then underwent an extinction treatment (S1-, S2-) and a second was merely exposed to the experimental contexts without any stimulus events...
May 4, 2017: Journal of Experimental Psychology. Animal Learning and Cognition
https://www.readbyqxmd.com/read/28469564/pavlovian-conditioning-of-larval-drosophila-an-illustrated-multilingual-hands-on-manual-for-odor-taste-associative-learning-in-maggots
#17
Birgit Michels, Timo Saumweber, Roland Biernacki, Jeanette Thum, Rupert D V Glasgow, Michael Schleyer, Yi-Chun Chen, Claire Eschbach, Reinhard F Stocker, Naoko Toshima, Teiichi Tanimura, Matthieu Louis, Gonzalo Arias-Gil, Manuela Marescotti, Fabio Benfenati, Bertram Gerber
Larval Drosophila offer a study case for behavioral neurogenetics that is simple enough to be experimentally tractable, yet complex enough to be worth the effort. We provide a detailed, hands-on manual for Pavlovian odor-reward learning in these animals. Given the versatility of Drosophila for genetic analyses, combined with the evolutionarily shared genetic heritage with humans, the paradigm has utility not only in behavioral neurogenetics and experimental psychology, but for translational biomedicine as well...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28465027/quantitative-models-of-persistence-and-relapse-from-the-perspective-of-behavioral-momentum-theory-fits-and-misfits
#18
REVIEW
John A Nevin, Andrew R Craig, Paul J Cunningham, Christopher A Podlesnik, Timothy A Shahan, Mary M Sweeney
We review quantitative accounts of behavioral momentum theory (BMT), its application to clinical treatment, and its extension to post-intervention relapse of target behavior. We suggest that its extension can account for relapse using reinstatement and renewal models, but that its application to resurgence is flawed both conceptually and in its failure to account for recent data. We propose that the enhanced persistence of target behavior engendered by alternative reinforcers is limited to their concurrent availability within a distinctive stimulus context...
April 29, 2017: Behavioural Processes
https://www.readbyqxmd.com/read/28461477/opposing-roles-of-primate-areas-25-and-32-and-their-putative-rodent-homologs-in-the-regulation-of-negative-emotion
#19
Chloe U Wallis, Rudolf N Cardinal, Laith Alexander, Angela C Roberts, Hannah F Clarke
Disorders of dysregulated negative emotion such as depression and anxiety also feature increased cardiovascular mortality and decreased heart-rate variability (HRV). These disorders are correlated with dysfunction within areas 25 and 32 of the ventromedial prefrontal cortex (vmPFC), but a causal relationship between dysregulation of these areas and such symptoms has not been demonstrated. Furthermore, cross-species translation is limited by inconsistent findings between rodent fear extinction and human neuroimaging studies of negative emotion...
May 1, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28450844/stimulus-control-over-action-for-food-in-obese-versus-healthy-weight-individuals
#20
Poppy Watson, Reinout W Wiers, Bernhard Hommel, Victor E A Gerdes, Sanne de Wit
In the current study we examined an associative learning mechanism by which food cues (signaling low- versus high-calorie food) can bias instrumental responses directed toward those foods. To investigate the clinical relevance of this mechanism, we used a computerized Pavlovian-to-instrumental transfer task and compared performance of 19 severely obese individuals to that of 19 healthy-weight controls matched for age, education and gender. During the response-priming test we exposed participants to both food pictures and to Pavlovian cues predictive of those food pictures, and examined their biasing effect on instrumental choice...
2017: Frontiers in Psychology
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