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Fear conditioning

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https://www.readbyqxmd.com/read/28345433/the-contextual-malleability-of-approach-avoidance-training-effects-approaching-or-avoiding-fear-conditioned-stimuli-modulates-effects-of-approach-avoidance-training
#1
Gaëtan Mertens, Pieter Van Dessel, Jan De Houwer
Previous research showed that the repeated approaching of one stimulus and avoiding of another stimulus typically leads to more positive evaluations of the former stimuli. In the current study, we examined whether approach and avoidance training (AAT) effects on evaluations of neutral stimuli can be modulated by introducing a regularity between the approach-avoidance actions and a positive or negative (feared) stimulus. In an AAT task, participants repeatedly approached one neutral non-word and avoided another neutral non-word...
March 27, 2017: Cognition & Emotion
https://www.readbyqxmd.com/read/28344069/selective-post-training-time-window-for-memory-consolidation-interference-of-cannabidiol-into-the-prefrontal-cortex-reduced-dopaminergic-modulation-and-immediate-gene-expression-in-limbic-circuits
#2
Matheus Teixeira Rossignoli, Cleiton Lopes-Aguiar, Rafael Naime Ruggiero, Raquel Araujo Do Val da Silva, Lezio Soares Bueno-Junior, Ludmyla Kandratavicius, José Eduardo Peixoto-Santos, José Alexandre Crippa, Jaime Eduardo Cecilio Hallak, Antonio Waldo Zuardi, Raphael Escorsim Szawka, Janete Anselmo-Franci, João Pereira Leite, Rodrigo Neves Romcy-Pereira
The prefrontal cortex (PFC), amygdala and hippocampus display a coordinated activity during acquisition of associative fear memories. Evidence indicates that PFC engagement in aversive memory formation does not progress linearly as previously thought. Instead, it seems to be recruited at specific time windows after memory acquisition, which has implications for the treatment of post-traumatic stress disorders. Cannabidiol (CBD), the major non-psychotomimetic phytocannabinoid of the Cannabis sativa plant, is known to modulate contextual fear memory acquisition in rodents...
March 23, 2017: Neuroscience
https://www.readbyqxmd.com/read/28341611/extinction-memory-is-facilitated-by-methylphenidate-and-regulated-by-dopamine-and-noradrenaline-receptors
#3
Cristiane R G Furini, Jonny A K Behling, Carolina G Zinn, Mara Lize Zanini, Eduardo S Assis Brasil, Luiza Doro Pereira, Ivan Izquierdo, Jociane de C Myskiw
Extinction is defined as the learned inhibition of retrieval and is the mainstay of exposure therapy, which is widely used to treat drug addiction, phobias and fear disorders. The psychostimulant, methylphenidate (MPH) is known to increase extracellular levels of noradrenaline and dopamine by blocking their reuptake and studies have demonstrated that MPH can modulate hippocampal physiology and/or functions including long-term potentiation (LTP), learning and memory. However, the influence of MPH on fear extinction memory has been insufficiently studied...
March 21, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28341234/radioprotective-effect-of-ursolic-acid-in-radiation-induced-impairment-of-neurogenesis-learning-and-memory-in-adolescent-balb-c-mouse
#4
Feng Ru Tang, Weng Keong Loke, Wong Pei Yan, Boo Cheong Khoo
The effect of acute irradiation with 5Gy or fractionated exposure with 0.5Gy continuously for 10days (a total dose of 5Gy) was evaluated in an immature BALB/c mouse model. Radioprotective effect of ursolic acid (at 25mg/kg/daily administered 1h after acute or each of fractionated irradiations, and continuously for 30days) was also investigated. We found that both acute and fractionated irradiation at a total dose of 5Gy did not induce any mortality within 30days after exposure to postnatal day 26 (P26) BALB/c mice, but reduced animal weigh gain in the first few weeks...
March 21, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28341145/facial-correlates-of-emotional-behaviour-in-the-domestic-cat-felis-catus
#5
Valerie Bennett, Nadine Gourkow, Daniel S Mills
Leyhausen's (1979) work on cat behaviour and facial expressions associated with offensive and defensive behaviour is widely embraced as the standard for interpretation of agonistic behaviour in this species. However, it is a largely anecdotal description that can be easily misunderstood. Recently a facial action coding system has been developed for cats (CatFACS), similar to that used for objectively coding human facial expressions. This study reports on the use of this system to describe the relationship between behaviour and facial expressions of cats in confinement contexts without and with human interaction, in order to generate hypotheses about the relationship between these expressions and underlying emotional state...
March 21, 2017: Behavioural Processes
https://www.readbyqxmd.com/read/28340198/reasons-to-wait-or-to-treat-naive-patients-affected-by-chronic-hepatitis-c-with-low-fibrosis-stage-and-genotypes-2-or-3
#6
Lucio Boglione, Jessica Cusato, Giuseppe Cariti, Giovanni Di Perri, Antonio D'Avolio
New interferon (IFN)-free therapies are not currently available for all patients with chronic hepatitis C due to higher costs; in Italy, patients with genotype 2 (GT2) or GT3 without severe fibrosis can choose between wait or treatment with pegylated (PEG)-IFN and ribavirin. This study wants to examine the real rate of patients that accept or refused this therapy and the reasons related to decision. This prospective, observational analysis was performed at our centre between January 2014 and June 2015. Epidemiological, social and clinical data were collected in medical records; reasons for treatment acceptance/refusal were recorded through a questionnaire...
March 10, 2017: European Journal of Public Health
https://www.readbyqxmd.com/read/28339976/effects-of-two-different-broiler-flooring-systems-on-production-performances-welfare-and-environment-under-commercial-production-conditions
#7
H Li, X Wen, R Alphin, Z Zhu, Z Zhou
Research comparing conventional litter and alternative perforated flooring (netting) systems is relatively limited under commercial production conditions. A comprehensive comparison of broiler production performances, welfare quality, and housing environment of two broiler houses with conventional litter and new perforated plastic floors was conducted over four flocks for eight months in eastern China. The two broiler houses each had 31,700 broilers per flock on average and were ventilated using a negative-pressure system...
March 3, 2017: Poultry Science
https://www.readbyqxmd.com/read/28339575/histaminergic-neurotransmission-as-a-gateway-for-the-cognitive-effect-of-oleoylethanolamide-in-contextual-fear-conditioning
#8
Gustavo Provensi, Roberta Fabbri, Leonardo Munari, Alessia Costa, Elisabetta Baldi, Corrado Bucherelli, Patrizio Blandina, Maria Beatrice Passani
Background: The integrity of the brain histaminergic system is necessary for the unfolding of homeostatic and cognitive processes through the recruitment of alternative circuits with distinct temporal patterns. We recently demonstrated that the fat-sensing lipid mediator oleoylethanolamide indirectly activates histaminergic neurons to exerts its hypophagic effects. The present experiments investigated whether histaminergic neurotransmission is necessary also for the modulation of emotional memory induced by oleoylethanolamide in a contextual fear conditioning paradigm...
January 19, 2017: International Journal of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28338738/task-related-functional-connectivity-analysis-of-emotion-discrimination-in-a-family-study-of-schizophrenia
#9
Vina M Goghari, Nicole Sanford, Michael J Spilka, Todd S Woodward
Poor emotion recognition is a core deficit in schizophrenia and is associated with poor functional outcome. Functional magnetic resonance imaging (fMRI) multivariate analysis methods were used to elucidate the neural underpinnings of face and emotion processing associated with both genetic liability and disease-specific effects. Schizophrenia patients, relatives, and controls completed a task that included 4 facial emotion discrimination conditions and an age discrimination condition during fMRI. Three functional networks were derived from the data: the first involved in visual attention and response generation, the second a default mode network (DMN), and a third involved in face and emotion processing...
February 16, 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/28337114/precondition-of-right-frontal-region-with-anodal-tdcs-can-restore-the-fear-memory-impairment-induced-by-acpa-in-male-mice
#10
Fariborz Manteghi, Mohammad Nasehi, Mohammad-Reza Zarrindast
Fear memory and learning cause behavioural patterns such as fight or flight responses, which increase survival probability, but unfit processing of fear memory and learning can lead to maladaptive behaviours and maladies such as phobias, Post-Traumatic Stress Disorder (PTSD) and anxiety disorders. The growing prevalence of these maladies shows the need to quest novel methods for their treatment. We used anodal transcranial direct current stimulation (tDCS) on the right frontal region as a precondition neuromodulator and arachidonylcyclopropylamide (ACPA), a selective CB1 cannabinoid receptor agonist, as a fear memory impairing agent to assess their effects on contextual and auditory fear conditioning (reliable model for fear studies)...
2017: EXCLI journal
https://www.readbyqxmd.com/read/28331799/commonalities-and-differences-in-the-neural-substrates-of-threat-predictability-in-panic-disorder-and-specific-phobia
#11
Anna Luisa Klahn, Isabelle A Klinkenberg, Ulrike Lueken, Swantje Notzon, Volker Arolt, Christo Pantev, Peter Zwanzger, Markus Junghoefer
Different degrees of threat predictability are thought to induce either phasic fear or sustained anxiety. Maladaptive, sustained anxious apprehension is thought to result in overgeneralization of anxiety and thereby to contribute to the development of anxiety disorders. Therefore, differences in threat predictability have been associated with pathological states of anxiety with specific phobia (SP) representing phasic fear as heightened response to predictable threat, while panic disorder (PD) is characterized by sustained anxiety (unpredictable threat) and, as a consequence, overgeneralization of fear...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28331016/brain-wide-maps-of-fos-expression-during-fear-learning-and-recall
#12
Jin-Hyung Cho, Sam D Rendall, Jesse M Gray
Fos induction during learning labels neuronal ensembles in the hippocampus that encode a specific physical environment, revealing a memory trace. In the cortex and other regions, the extent to which Fos induction during learning reveals specific sensory representations is unknown. Here we generate high-quality brain-wide maps of Fos mRNA expression during auditory fear conditioning and recall in the setting of the home cage. These maps reveal a brain-wide pattern of Fos induction that is remarkably similar among fear conditioning, shock-only, tone-only, and fear recall conditions, casting doubt on the idea that Fos reveals auditory-specific sensory representations...
April 2017: Learning & Memory
https://www.readbyqxmd.com/read/28329757/neural-ensemble-dynamics-underlying-a-long-term-associative-memory
#13
Benjamin F Grewe, Jan Gründemann, Lacey J Kitch, Jerome A Lecoq, Jones G Parker, Jesse D Marshall, Margaret C Larkin, Pablo E Jercog, Francois Grenier, Jin Zhong Li, Andreas Lüthi, Mark J Schnitzer
The brain's ability to associate different stimuli is vital for long-term memory, but how neural ensembles encode associative memories is unknown. Here we studied how cell ensembles in the basal and lateral amygdala encode associations between conditioned and unconditioned stimuli (CS and US, respectively). Using a miniature fluorescence microscope, we tracked the Ca(2+) dynamics of ensembles of amygdalar neurons during fear learning and extinction over 6 days in behaving mice. Fear conditioning induced both up- and down-regulation of individual cells' CS-evoked responses...
March 22, 2017: Nature
https://www.readbyqxmd.com/read/28329711/one-for-all-the-effect-of-extinction-stimulus-typicality-on-return-of-fear
#14
Sara Scheveneels, Yannick Boddez, Marc Patrick Bennett, Dirk Hermans
BACKGROUND AND OBJECTIVES: During exposure therapy, patients are encouraged to approach the feared stimulus, so they can experience that this stimulus is not followed by the anticipated aversive outcome. However, patients might treat the absence of the aversive outcome as an 'exception to the rule'. This could hamper the generalization of fear reduction when the patient is confronted with similar stimuli not used in therapy. We examined the effect of providing information about the typicality of the extinction stimulus on the generalization of extinction to a new but similar stimulus...
March 18, 2017: Journal of Behavior Therapy and Experimental Psychiatry
https://www.readbyqxmd.com/read/28328269/physical-activity-and-exercise-after-stoma-surgery-overcoming-the-barriers
#15
Sarah Russell
This article presents the results from a large nationwide survey completed in 2016 that investigated the physical health and wellbeing of people living with stomas in the UK. In particular, the survey looked at physical activity and exercise, general attitudes and opinions about exercise, whether or not advice about physical activity had been received and other general questions about parastomal hernia and quality of life. There were 2631 respondents making it one of the largest known surveys to date. The findings were concerning yet unsurprising, highlighting a trend toward inactivity after stoma surgery and a fear of exercise in general...
March 9, 2017: British Journal of Nursing: BJN
https://www.readbyqxmd.com/read/28323200/brief-exercise-enhances-intrusive-memories-of-traumatic-stimuli
#16
Dharani Keyan, Richard A Bryant
Brief physical exercise enhances memories for neutral events, and recently has been shown to modulate fear learning in animals. To date there is no evidence pertaining to the impact of exercise on emotional memories in humans. Accordingly, this study investigated the role of brief exercise in the development of emotional intrusive memories. Forty-nine university students (18-29year olds) viewed a car accident film depicting accident and injury, and were then randomly assigned to engage in either 10min of intense exercise or easy walking...
March 18, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28322983/the-relationship-between-fear-extinction-and-resilience-to-drug-dependence-in-rats
#17
Masaharu Ueno, Kazuo Yamada, Yukio Ichitani
Some individuals recover quickly from stressful events, while others do not; this suggests that there are individual differences in stress resilience. Previous studies in rats have shown that an animal's ability to extinguish conditioned fear can predict their stress resilience. In the present study, we investigated whether rats who are resilient or vulnerable to fear conditioning would consistently show resilient or vulnerable behaviors in other behavioral tests. Male Wistar-Imamichi rats were subjected to a series of behavioral tests, including open field, conditioned place-preference (CPP), forced swim and auditory fear conditioning...
March 18, 2017: Neuroscience Research
https://www.readbyqxmd.com/read/28321201/placebo-and-nocebo-effects-the-advantage-of-measuring-expectations-and-psychological-factors
#18
Nicole Corsi, Luana Colloca
Several studies have explored the predictability of placebo and nocebo individual responses by investigating personality factors and expectations of pain decreases and increases. Psychological factors such as optimism, suggestibility, empathy and neuroticism have been linked to placebo effects, while pessimism, anxiety and catastrophizing have been associated to nocebo effects. We aimed to investigate the interplay between psychological factors, expectations of low and high pain and placebo hypoalgesia and nocebo hyperalgesia...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28320841/prefrontal-cortex-kca2-channels-regulate-mglu5-dependent-plasticity-and-extinction-of-alcohol-seeking-behavior
#19
Reginald Cannady, Justin T McGonigal, Ryan J Newsom, John J Woodward, Patrick J Mulholland, Justin T Gass
Identifying novel treatments that facilitate extinction learning could enhance cue-exposure therapy and reduce high relapse rates in alcoholics. Activation of mGlu5 receptors in the infralimbic prefrontal cortex (IL-PFC) facilitates learning during extinction of cue-conditioned alcohol-seeking behavior. Small-conductance calcium-activated potassium (KCa2) channels have also been implicated in extinction learning of fear memories, and mGlu5 receptor activation can reduce KCa2 channel function. Using a combination of electrophysiological, pharmacological, and behavioral approaches, this study examined KCa2 channels as a novel target to facilitate extinction of alcohol-seeking behavior in rats...
March 20, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28320733/the-psychological-features-of-patellofemoral-pain-a-systematic-review
#20
REVIEW
Liam R Maclachlan, Natalie J Collins, Mark L G Matthews, Paul W Hodges, Bill Vicenzino
BACKGROUND: Patellofemoral pain (PFP) is prevalent in adolescence and adulthood and often persists. In contrast to other persistent musculoskeletal conditions, for which non-physical, psychological features are implicated, PFP remains largely conceptualised in mechanical terms. AIMS: To (1) identify whether the psychological characteristics of individuals with PFP differs from asymptomatic controls and (2) evaluate the correlations between psychological characteristics and PFP severity...
March 20, 2017: British Journal of Sports Medicine
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