keyword
MENU ▼
Read by QxMD icon Read
search

Fear conditioning

keyword
https://www.readbyqxmd.com/read/27925650/a-pupil-size-response-model-to-assess-fear-learning
#1
Christoph W Korn, Matthias Staib, Athina Tzovara, Giuseppe Castegnetti, Dominik R Bach
During fear conditioning, pupil size responses dissociate between conditioned stimuli that are contingently paired (CS+) with an aversive unconditioned stimulus, and those that are unpaired (CS-). Current approaches to assess fear learning from pupil responses rely on ad hoc specifications. Here, we sought to develop a psychophysiological model (PsPM) in which pupil responses are characterized by response functions within the framework of a linear time-invariant system. This PsPM can be written as a general linear model, which is inverted to yield amplitude estimates of the eliciting process in the central nervous system...
December 7, 2016: Psychophysiology
https://www.readbyqxmd.com/read/27924874/context-and-auditory-fear-are-differentially-regulated-by-hdac3-activity-in-the-lateral-and-basal-subnuclei-of-the-amygdale
#2
Janine L Kwapis, Yasaman Alaghband, Alberto J López, André O White, Rianne R Campbell, Richard T Dang, Diane Rhee, Ashley V Tran, Allison E Carl, Dina P Matheos, Marcelo A Wood
Histone acetylation is a fundamental epigenetic mechanism that is dynamically regulated during memory formation. Histone acetyltransferases (HATs) and histone deacetylases (HDACs) compete to modulate histone acetylation, allowing for rapid changes in acetylation in response to a learning event. HDACs are known to be powerful negative regulators of memory formation, but it is not clear whether this function depends on HDAC enzymatic activity per se. Here, we tested whether the enzymatic activity of an individual Class I HDAC, HDAC3, plays a role in fear memory formation in subregions of the hippocampus and amygdala...
December 7, 2016: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/27922638/enhancing-dopaminergic-signaling-and-histone-acetylation-promotes-long-term-rescue-of-deficient-fear-extinction
#3
N Whittle, V Maurer, C Murphy, J Rainer, D Bindreither, M Hauschild, A Scharinger, M Oberhauser, T Keil, C Brehm, T Valovka, J Striessnig, N Singewald
Extinction-based exposure therapy is used to treat anxiety- and trauma-related disorders; however, there is the need to improve its limited efficacy in individuals with impaired fear extinction learning and to promote greater protection against return-of-fear phenomena. Here, using 129S1/SvImJ mice, which display impaired fear extinction acquisition and extinction consolidation, we revealed that persistent and context-independent rescue of deficient fear extinction in these mice was associated with enhanced expression of dopamine-related genes, such as dopamine D1 (Drd1a) and -D2 (Drd2) receptor genes in the medial prefrontal cortex (mPFC) and amygdala, but not hippocampus...
December 6, 2016: Translational Psychiatry
https://www.readbyqxmd.com/read/27922320/discrimination-between-safe-and-unsafe-stimuli-mediates-the-relationship-between-trait-anxiety-and-return-of-fear
#4
Lindsay K Staples-Bradley, Michael Treanor, Michelle G Craske
Individuals with anxiety disorders show deficits in the discrimination between a cue that predicts an aversive outcome and a safe stimulus that predicts the absence of that outcome. This impairment has been linked to increased spontaneous recovery of fear following extinction, however it is unknown if there is a link between discrimination and return of fear in a novel context (i.e. context renewal). It is also unknown if impaired discrimination mediates the relationship between trait anxiety and either spontaneous recovery or context renewal...
December 6, 2016: Cognition & Emotion
https://www.readbyqxmd.com/read/27921340/brain-activation-during-fear-extinction-predicts-exposure-success
#5
Tali Manber Ball, Sarah E Knapp, Martin P Paulus, Murray B Stein
BACKGROUND: Exposure therapy, a gold-standard treatment for anxiety disorders, is assumed to work via extinction learning, but this has never been tested. Anxious individuals demonstrate extinction learning deficits, likely related to less ventromedial prefrontal cortex (vmPFC) and more amygdala activation, but the relationship between these deficits and exposure outcome is unknown. We tested whether anxious individuals who demonstrate better extinction learning report greater anxiety reduction following brief exposure...
December 6, 2016: Depression and Anxiety
https://www.readbyqxmd.com/read/27920806/hereditary-multiple-exostoses-a-review-of-clinical-appearance-and-metabolic-pattern
#6
REVIEW
Giovanni Beltrami, Gabriele Ristori, Guido Scoccianti, Angela Tamburini, Rodolfo Capanna
Hereditary multiple exostoses (HME) is an inherited genetic condition characterized by the presence of multiple exostoses (osteochondromas). MHE is a relatively rare autosomal dominant disorder, mainly caused by loss of function mutations in two genes: exostosin-1 (EXT1) and exostosin-2 (EXT2). These genes are linked to heparan sulfate (HS) synthesis, but the specific molecular mechanism leading to the disruption of the cartilage structure and the consequent exostoses formation is still not resolved. The aim of this paper is to encounter the main aspects of HME reviewing the literature, in order to improve clinical features and evolution, and the metabolic-pathogenetic mechanisms underlying...
May 2016: Clinical Cases in Mineral and Bone Metabolism
https://www.readbyqxmd.com/read/27919830/newly-acquired-and-reactivated-contextual-fear-memories-are-more-intense-and-prone-to-generalize-after-activation-of-prelimbic-cortex-nmda-receptors
#7
Ana C Vanvossen, Marina A M Portes, Rafael Scoz-Silva, Hugo B Reichmann, Cristina A J Stern, Leandro J Bertoglio
Activity in the rodent prelimbic (PL) cortex contributes to consolidation, retrieval and reconsolidation of learned fear. The PL cortex is considered homologous to the primate dorsal anterior cingulate cortex (dACC). In patients with post-traumatic stress disorder (PTSD), the dACC is often reported to be hyperactive after acquisition and/or around the retrieval of the traumatic memory. It is still unknown, however, whether there is a relationship between altered dACC functioning at these time points and PTSD-associated behavioral outcomes, such as fear overgeneralization...
December 2, 2016: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/27918278/pi3-kinase-cascade-has-a-differential-role-in-acquisition-and-extinction-of-conditioned-fear-memory-in-juvenile-and-adult-rats
#8
Ilana Slouzkey, Mouna Maroun
The basolateral amygdala (BLA), medial prefrontal cortex (mPFC) circuit, plays a crucial role in acquisition and extinction of fear memory. Extinction of aversive memories is mediated, at least in part, by the phosphoinositide-3 kinase (PI3K)/Akt pathway in adult rats. There is recent interest in the neural mechanisms that mediate fear and extinction in juvenile animals and whether these mechanisms are distinctive from those in adult animals. In the present study, we examined (1) changes in phosphorylation of Akt in the BLA and mPFC after fear conditioning and extinction in juvenile and adult rats and (2) the effect of BLA and mPFC localized inhibition of the PI3K following acquisition and extinction of contextual fear memory...
December 2016: Learning & Memory
https://www.readbyqxmd.com/read/27918276/repeated-recall-and-pkm%C3%AE-maintain-fear-memories-in-juvenile-rats
#9
Chicora F Oliver, Patricia Kabitzke, Peter Serrano, Laura J Egan, Gordon A Barr, Harry N Shair, Christoph Wiedenmayer
We examined the neural substrates of fear memory formation and maintenance when repeated recall was used to prevent forgetting in young animals. In contrast to adult rats, juveniles failed to show contextual fear responses at 4 d post-fear conditioning. Reconsolidation sessions 3 and 6 d after conditioning restored contextual fear responses in juveniles 7 d after initial training. In juveniles that received reconsolidation sessions, protein kinase M zeta (PKMζ) increased in the amygdala, but not in the hippocampus...
December 2016: Learning & Memory
https://www.readbyqxmd.com/read/27918275/behavioral-mechanisms-of-context-fear-generalization-in-mice
#10
Kylie A Huckleberry, Laura B Ferguson, Michael R Drew
There is growing interest in generalization of learned contextual fear, driven in part by the hypothesis that mood and anxiety disorders stem from impaired hippocampal mechanisms of fear generalization and discrimination. However, there has been relatively little investigation of the behavioral and procedural mechanisms that might control generalization of contextual fear. We assessed the relative contribution of different contextual features to context fear generalization and characterized how two common conditioning protocols-foreground (uncued) and background (cued) contextual fear conditioning-affected context fear generalization...
December 2016: Learning & Memory
https://www.readbyqxmd.com/read/27918273/neural-circuits-via-which-single-prolonged-stress-exposure-leads-to-fear-extinction-retention-deficits
#11
Dayan Knox, Briana R Stanfield, Jennifer M Staib, Nina P David, Samantha M Keller, Thomas DePietro
Single prolonged stress (SPS) has been used to examine mechanisms via which stress exposure leads to post-traumatic stress disorder symptoms. SPS induces fear extinction retention deficits, but neural circuits critical for mediating these deficits are unknown. To address this gap, we examined the effect of SPS on neural activity in brain regions critical for extinction retention (i.e., fear extinction circuit). These were the ventral hippocampus (vHipp), dorsal hippocampus (dHipp), basolateral amygdala (BLA), prelimbic cortex (PL), and infralimbic cortex (IL)...
December 2016: Learning & Memory
https://www.readbyqxmd.com/read/27918272/rats-can-acquire-conditional-fear-of-faint-light-leaking-through-the-acrylic-resin-used-to-mount-fiber-optic-cannulas
#12
Adam Eckmier, Willy Daney de Marcillac, Agnès Maître, Thérèse M Jay, Matthew J Sanders, Bill P Godsil
Rodents are exquisitely sensitive to light and optogenetic behavioral experiments routinely introduce light-delivery materials into experimental situations, which raises the possibility that light could leak and influence behavioral performance. We examined whether rats respond to a faint diffusion of light, termed caplight, which emanated through the translucent dental acrylic resin used to affix deep-brain optical cannulas in place. Although rats did not display significant changes in locomotion or rearing to caplight in a darkened open field, they did acquire conditional fear via caplight-footshock pairings...
December 2016: Learning & Memory
https://www.readbyqxmd.com/read/27915119/neural-correlates-of-pupil-dilation-during-human-fear-learning
#13
Laura Leuchs, Max Schneider, Michael Czisch, Victor I Spoormaker
BACKGROUND: Fear conditioning and extinction are prevailing experimental and etiological models for normal and pathological anxiety. Pupil dilations in response to conditioned stimuli are increasingly used as a robust psychophysiological readout of fear learning, but their neural correlates remain unknown. We aimed at identifying the neural correlates of pupil responses to threat and safety cues during a fear learning task. METHODS: Thirty-four healthy subjects underwent a fear conditioning and extinction paradigm with simultaneous functional magnetic resonance imaging (fMRI) and pupillometry...
December 1, 2016: NeuroImage
https://www.readbyqxmd.com/read/27913953/neuroinflammation-induced-downregulation-of-hippocampacal-neuregulin-1-erbb4-signaling-in-the-parvalbumin-interneurons-might-contribute-to-cognitive-impairment-in-a-mouse-model-of-sepsis-associated-encephalopathy
#14
Rong Gao, Mu-Huo Ji, Da-Peng Gao, Run-Hua Yang, Shao-Gang Zhang, Jian-Jun Yang, Jin-Chun Shen
Sepsis-associated encephalopathy (SAE) is a common complication associated with poor prognosis in septic patients, but the underlying mechanism remains unclear. We hypothesized that disturbed neuregulin 1 (NRG1)-ErbB4 signaling in the parvalbumin interneurons was involved in sepsis-induced cognitive impairment in a mouse model of SAE. The SAE model was induced by cecal ligation/perforation (CLP). Animals were randomly divided into the following six groups: sham + vehicle group, sham + NRG1 group, CLP + vehicle group, CLP + NRG1 group, CLP + NRG1 + AG1478 (ErbB4 inhibitor) group, and CLP + minocycline group...
December 2, 2016: Inflammation
https://www.readbyqxmd.com/read/27911310/cholinergic-modification-of-neurogenesis-and-gliosis-improves-the-memory-of%C3%A2-a%C3%AE-ppswe-psen1de9-alzheimer-s-disease-model-mice-fed-a-high-fat-diet
#15
Takeshi Matsuda, Tatsuhiro Hisatsune
We previously reported that neuroinflammation contributes to the amnesia of AβPPswe/PSEN1dE9 Alzheimer's disease model mice fed a high-fat diet to induce type-2 diabetes (T2DM-AD mice), but the underlying mechanism for the memory decline remained unclear. Recent studies have suggested that cholinergic modulation is involved in neuroinflammatory cellular reactions including neurogenesis and gliosis, and in memory improvement. In this study, we administered a broad-spectrum cholinesterase inhibitor, rivastigmine (2 mg/kg/day, s...
November 28, 2016: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/27911085/perceived-neighborhood-conditions-and-depression-positive-local-news-as-a-buffering-factor
#16
Masahiro Yamamoto
This study investigates positive local news as a moderator of the effects of perceived neighborhood conditions on depression. Data from an online survey of Chicago residents indicate that the relationship between fear of crime and depression is weaker for respondents who pay more attention to positive local news. Data also reveal that the indirect relationships that perceived neighborhood disorder and crime have with depression through fear of crime are weaker as attention to positive local news increases. Implications are discussed for the role of positive news as a protective factor for mental health...
December 2, 2016: Health Communication
https://www.readbyqxmd.com/read/27910798/a-qualitative-study-of-women-who-experience-side-effects-from-human-papillomavirus-vaccination
#17
Tina Sørensen, Pernille Tanggaard Andersen
INTRODUCTION: In Denmark, vaccination against human papillomavirus (HPV) is offered to girls and women to prevent cervical cancer. Unfortunately, reporting of possible side effects from vaccination has increased in recent years. Therefore, the present study examine women's experiences of side effects from the HPV vaccine. METHODS: In-depth qualitative interviews were conducted with eight HPV-vaccinated Danish women, aged 25-44 years, who experienced side effects from the vaccine...
December 2016: Danish Medical Journal
https://www.readbyqxmd.com/read/27909069/parental-reports-of-serious-illness-and-disability-among-children-aged-3-16%C3%A2-years-from-uk-military-families
#18
Charandeep K Khera, S A M Stevelink, N T Fear
BACKGROUND: Prevalence rates of child illness according to parents have been found to vary greatly in the general population, with even less known about children of military parents. Mothers are generally considered more informed about their children's problems than fathers. This paper aimed to establish the prevalence of serious illness and disability among children from military families, noting the difference between parental reports. METHODS: Male serving and ex-serving personnel with children aged 3-16 years were invited to take part in an online questionnaire and telephone interview based on their child's health...
December 1, 2016: Journal of the Royal Army Medical Corps
https://www.readbyqxmd.com/read/27908784/cisplatin-induced-mitochondrial-dysfunction-is-associated-with-impaired-cognitive-function-in-rats
#19
Naomi Lomeli, Kaijun Di, Jennifer Czerniawski, John F Guzowski, Daniela A Bota
PURPOSE: Chemotherapy-related cognitive impairment (CRCI) is commonly reported following the administration of chemotherapeutic agents and comprises a wide variety of neurological problems. No effective treatments for CRCI are currently available. Here we examined the mechanisms involving cisplatin-induced hippocampal damage following cisplatin administration in a rat model and in cultured rat hippocampal neurons and neural stem/progenitor cells (NSC). We also assessed the protective effects of the antioxidant, N-acetylcysteine in mitigating these damages...
November 28, 2016: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/27908524/genetic-correlation-between-alcohol-preference-and-conditioned-fear-exploring-a-functional-relationship
#20
Julia A Chester, Marcus M Weera
Post-traumatic stress disorder (PTSD) and alcohol-use disorders have a high rate of co-occurrence, possibly because they are regulated by common genes. In support of this idea, mice selectively bred for high (HAP) alcohol preference show greater fear potentiated startle (FPS), a model for fear-related disorders such as PTSD, compared to mice selectively bred for low (LAP) alcohol preference. This positive genetic correlation between alcohol preference and FPS behavior suggests that the two traits may be functionally related...
November 23, 2016: Alcohol
keyword
keyword
36235
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"